Energy Fuels (UUUU) 10-K23 Feb 242023 FY Annual reportFinancial data

Company Profile

Cover Page

Cover Page - USD ($) $ in Thousands	12 Months Ended
Cover Page - USD ($) $ in Thousands	Dec. 31, 2023	Feb. 21, 2024	Jun. 30, 2023
Entity Listings [Line Items]
Document Type	10-K
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Document Period End Date	Dec. 31, 2023
Entity Registrant Name	ENERGY FUELS INC.
Entity File Number	001-36204
Entity Incorporation, State or Country Code	Z4
Entity Tax Identification Number	98-1067994
Entity Address, Address Line One	225 Union Blvd., Suite 600
Entity Address, State or Province	CO
Entity Address, City or Town	Lakewood,
Entity Address, Postal Zip Code	80228
City Area Code	303
Local Phone Number	974-2140
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Title of 12(b) Security	Common Shares, no par value
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 954,990
Entity Common Stock, Shares Outstanding (in shares)		163,570,079
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0001385849
Amendment Flag	false
Document Financial Statement Error Correction [Flag]	false
NEW YORK STOCK EXCHANGE, INC.
Entity Listings [Line Items]
Trading Symbol	UUUU
Security Exchange Name	NYSEAMER
TORONTO STOCK EXCHANGE
Entity Listings [Line Items]
Title of 12(b) Security	Common shares, no par value

Audit Information

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2023
Audit Information [Abstract]
Auditor Name	KPMG LLP
Auditor Location	Denver, CO
Auditor Firm ID	185

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive (Income) Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenues, Uranium Concentrates	$ 33,278	$ 0	$ 0
Vanadium concentrates	871	8,778	74
RE Carbonate	2,848	2,122	1,385
Alternate Feed Materials, processing and other	931	1,615	1,725
Total revenues	37,928	12,515	3,184
Costs applicable to uranium concentrates	15,318	0	0
Costs applicable to vanadium concentrates	551	3,769	48
Costs applicable to RE Carbonate	2,312	1,317	1,235
Underutilized capacity production costs applicable to RE Carbonate	0	2,758	531
Total costs applicable to revenues	18,181	7,844	1,814
Exploration, development and processing	15,531	9,346	10,750
Standby	7,476	13,221	9,462
Accretion of asset retirement obligations	1,192	1,556	1,284
Selling, general and administration	27,915	25,486	15,299
Total operating loss	(32,367)	(44,938)	(35,425)
Gain on sale of assets	119,257	366	35,733
Other income (loss) (Note 13)	13,142	(15,372)	1,140
Total other income (loss)	132,399	(15,006)	36,873
Income (loss) before income taxes	100,032	(59,944)	1,448
Income tax expense	(276)	0	0
Net income (loss)	99,756	(59,944)	1,448
Items that may be reclassified in the future to income (loss)
Foreign currency translation adjustment	0	(3,889)	(365)
Other comprehensive loss	0	(3,889)	(365)
Comprehensive income (loss)	$ 99,756	$ (63,833)	$ 1,083
Basic Net (loss) income per share (in dollars per share)	$ 0.63	$ (0.38)	$ 0.01
Net income (loss) attributable to:
Owners of the Company	$ 99,862	$ (59,849)	$ 1,541
Non-controlling interests	(106)	(95)	(93)
Net income (loss)	99,756	(59,944)	1,448
Comprehensive income (loss) attributable to:
Owners of the Company	99,862	(63,738)	1,176
Non-controlling interests	(106)	(95)	(93)
Comprehensive income (loss)	$ 99,756	$ (63,833)	$ 1,083
Diluted Net (loss) income per share (in dollars per share)	$ 0.62	$ (0.38)	$ 0.01

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 57,445	$ 62,820
Marketable securities (Notes 3 and 15)	133,044	12,192
Trade and other receivables, net of allowance for credit losses of $223 and $223 as of December 31, 2023 and 2022, respectively	816	519
Inventories (Note 5)	38,868	38,155
Prepaid expenses and other current assets	2,522	9,529
Property, plant and equipment and other assets held for sale, net (Note 7)	0	12,375
Total current assets	232,695	135,590
Other long-term receivables	1,534	1,537
Inventories (Note 5)	1,852	2,465
Operating lease right of use asset	1,219	1,376
Investments (Note 6)	1,356	19,329
Property, plant and equipment, net (Note 7)	26,123	12,662
Mineral properties (Note 7)	119,581	83,539
Restricted cash (Note 8)	17,579	17,449
Total assets	401,939	273,947
Current liabilities
Accounts payable and accrued liabilities (Note 13)	10,161	6,929
Operating lease liability	199	59
Deposits for assets held for sale	0	6,000
Asset retirement obligation and other liabilities held for sale (Note 8)	0	5,636
Total current liabilities	10,360	18,624
Operating lease liability	1,120	1,319
Asset retirement obligations (Note 8)	10,922	9,595
Deferred revenue	332	0
Total liabilities	22,734	29,538
Equity
Share capital Common shares, without par value, unlimited shares authorized; shares issued and outstanding 162,659,155 and 157,682,531 as of December 31, 2023 and 2022, respectively	733,450	698,493
Accumulated deficit	(356,258)	(456,120)
Accumulated other comprehensive loss	(1,946)	(1,946)
Total shareholders' equity	375,246	240,427
Non-controlling interests	3,959	3,982
Total equity	379,205	244,409
Total liabilities and equity	401,939	273,947
Commitments and contingencies (Note 14)

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 223	$ 223
Common stock, shares, issued (in shares)	162,659,155	157,682,531
Common Stock, Shares, Outstanding (in shares)	162,659,155	157,682,531

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock	Accumulated Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)	Total Shareholders' Equity	Non-Controlling Interests
Beginning Balance (in shares) at Dec. 31, 2020		134,311,033
Beginning Balance at Dec. 31, 2020	$ 157,546	$ 549,317	$ (397,812)	$ 2,308	$ 153,813	$ 3,733
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) for the period	1,448		1,541		1,541	(93)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(365)			(365)	(365)
Shares Issued For Cash By At The Market Offering Shares		16,627,512
Shares Issued For Cash By At The Market Offering	108,653	$ 108,653			108,653
Stock Issuance Costs	(2,445)	(2,445)			(2,445)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	2,158	$ 2,158			2,158
Shares Issued for Consulting Services		47,393
Adjustments to Additional Paid-in-Capital, Shares Issued For Consulting Services	$ 242	$ 242			242
Shares issued for the vesting of restricted stock units (in shares)	443,364	478,781
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units	$ 256	$ 256			256
Contributions attributable to non-controlling interest	311					311
Shares issued for public offering (in shares)		775,814
Adjustments to Additional Paid in Capital, Warrant Issued	26,603	$ 26,603			26,603
Stock Issued During Period, Value, Stock Options Exercised	$ 2,290	2,290			2,290
Effect of stock options exercised	5,643
Stock Issued During Period, Value, Cash Payment for Tax Withholding	$ 659	$ 659			659
Stock Issued For Exercise Of Warrants	1,737,981	4,016,023
Ending Balance (in shares) at Dec. 31, 2021		156,262,199
Ending Balance at Dec. 31, 2021	$ 295,526	$ 685,903	(396,271)	1,943	291,575	3,951
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) for the period	(59,944)		(59,849)		(59,849)	(95)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(3,889)			(3,889)	(3,889)
Shares Issued For Cash By At The Market Offering Shares		769,779
Shares Issued For Cash By At The Market Offering	8,068	$ 8,068			8,068
Stock Issuance Costs	(182)	(182)			(182)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	4,641	$ 4,641			4,641
Shares Issued for Consulting Services		28,254
Adjustments to Additional Paid-in-Capital, Shares Issued For Consulting Services	$ 205	$ 205			205
Shares issued for the vesting of restricted stock units (in shares)	335,546	362,350
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units	$ 11	$ 11			11
Contributions attributable to non-controlling interest	126					126
Shares issued for public offering (in shares)		256,314
Stock Issued During Period, Value, Stock Options Exercised	$ 753	$ 753			753
Effect of stock options exercised	3,635
Stock Issued During Period, Value, Cash Payment for Tax Withholding	$ 884	$ 884			884
Stock Issued For Exercise Of Warrants	0
Ending Balance (in shares) at Dec. 31, 2022		157,682,531
Ending Balance at Dec. 31, 2022	$ 244,409	$ 698,493	(456,120)	(1,946)	240,427	3,982
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) for the period	99,756		99,862		99,862	(106)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0
Shares Issued For Cash By At The Market Offering Shares		4,047,832
Shares Issued For Cash By At The Market Offering	32,545	$ 32,545			32,545
Stock Issuance Costs	(732)	(732)			(732)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		$ 4,625			4,625
Shares Issued for Consulting Services		140,672
Adjustments to Additional Paid-in-Capital, Shares Issued For Consulting Services	$ 252	$ 252			252
Shares issued for the vesting of restricted stock units (in shares)	290,390	312,662
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units	$ 1,533	$ 1,533			1,533
Contributions attributable to non-controlling interest	83					83
Shares issued for public offering (in shares)		207,866
Stock Issued During Period, Value, Stock Options Exercised	$ 718	$ 718			718
Effect of stock options exercised	267,592
Stock Issued During Period, Value, Cash Payment for Tax Withholding	$ 918	$ 918			918
Stock Issued For Exercise Of Warrants	0
Ending Balance (in shares) at Dec. 31, 2023		162,659,155
Ending Balance at Dec. 31, 2023	$ 379,205	$ 733,450	$ (356,258)	$ (1,946)	$ 375,246	$ 3,959

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net income (loss) for the period	$ 99,756	$ (59,944)	$ 1,448
Items not involving cash:
Depletion, depreciation and amortization	2,751	3,269	3,189
Share-based compensation	4,625	4,641	2,158
Gain on sale of assets	(119,257)	(366)	(35,733)
Realized gain on convertible note redemptions and sale	(1,430)	0	0
Change in value of warrant liabilities	0	0	8,078
Accretion of asset retirement obligations	1,192	1,556	1,284
Unrealized foreign exchange (gain) loss	(431)	(2,080)	129
Unrealized (gain) loss on investments	(15,472)	16,808	(6,311)
Realized loss on investments	10,491	0	0
Realized gain on marketable securities	(1,141)	0	0
Other, net	84	(93)	(156)
Changes in current assets and liabilities
Marketable securities	530	456	(795)
Inventories	(100)	(8,571)	(3,219)
Trade and other receivables	(237)	1,837	(1,249)
Prepaid expenses and other current assets	423	(8,886)	(257)
Accounts payable and accrued liabilities	2,807	1,671	2,140
Net cash used in operating activities	(15,409)	(49,702)	(29,294)
INVESTING ACTIVITIES
Additions to property, plant and equipment	(15,437)	(1,996)	(1,368)
Additions to mineral properties	(6,782)	0	0
Acquisition of mineral properties	(22,491)	0	0
Purchases of marketable securities	(174,622)	(11,435)	0
Maturities of marketable securities	79,041	0	2,554
Purchase of investments without a readily determinable fair value	(1,324)	0	0
Deposits for assets held for sale	0	6,000	0
Proceeds from sale of assets	56,875	366	2,000
Proceeds from convertible note redemptions and sale, net	60,887	0	0
Net cash provided by (used in) investing activities	(23,853)	(7,065)	3,186
FINANCING ACTIVITIES
Issuance of common shares for cash, net of issuance costs	31,813	7,886	106,208
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units	(918)	(884)	(538)
Cash received from exercise of stock options	970	753	2,375
Cash received from exercise of warrants	0	0	9,840
Cash paid to settle and fund employee income tax withholding due upon exercise of stock appreciation rights	(1,533)	(11)	(256)
Cash received from non-controlling interest	83	126	311
Net cash provided by financing activities	30,415	7,870	117,940
Effect of exchange rate fluctuations on cash held in foreign currencies	12	(66)	5
Less: restricted cash related to assets held for sale	0	3,590	0
Plus: release of restricted cash related to sale of assets	3,590	0	0
Net change in cash, cash equivalents and restricted cash	(5,245)	(52,553)	91,837
Cash, cash equivalents and restricted cash, beginning of period	80,269	132,822	40,985
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	75,024	80,269	132,822
Non-cash investing and financing transactions:
Cash paid during the period for interest	186	25	54
Increase (decrease) in accrued capital expenditures and accounts payable for property, plant and equipment	701	(161)	182
Issuance of common shares for consulting services	0	205	242
Acquisition of convertible note	$ 59,457	$ 0	$ 0

THE COMPANY AND DESCRIPTION OF

THE COMPANY AND DESCRIPTION OF BUSINESS	12 Months Ended
THE COMPANY AND DESCRIPTION OF BUSINESS	Dec. 31, 2023
Accounting Policies [Abstract]
The Company and Description of Business	THE COMPANY AND DESCRIPTION OF BUSINESS Energy Fuels Inc. was incorporated under the laws of the Province of Alberta and was continued under the Business Corporations Act (Ontario). Energy Fuels Inc. and its subsidiary companies (collectively, the “ Company ” or “ Energy Fuels ”) are together engaged in conventional and in situ recovery (“ ISR ”) uranium extraction, recovery and sales of uranium from mineral properties, and the recycling of uranium-bearing materials generated by third parties, along with the exploration, permitting and evaluation of uranium properties in the United States (the “ U.S. ”). As a part of these activities, the Company also acquires, explores, evaluates and, if warranted, permits uranium properties. The Company’s final uranium product, uranium oxide concentrate (“ U 3 O 8 ” or “ uranium concentrate ”), known more commonly as “yellowcake,” is sold to customers for further processing into fuel for nuclear reactors. The Company also produces vanadium pentoxide (“ V 2 O 5 ”) as a co-product of uranium at the White Mesa Mill (the “ White Mesa Mill ” or the “ Mill ”), from certain of its Colorado Plateau properties and at times from solutions in its Mill tailings impoundment system, each as market conditions warrant. The Mill is also ramping up to commercial production of rare earth element (“ REE ”) carbonate (“ RE Carbonate ”) from various uranium- and REE-bearing materials acquired from third parties and is working on modifications and enhancements to its existing infrastructure for the potential production of separated REE oxides. Additionally, the Company is evaluating the potential to recover radioisotopes from its existing uranium process streams at the Mill for use in targeted alpha therapy (“ TAT ”) therapeutics for the treatment of cancer. With its uranium, vanadium, REE and potential radioisotope production, the Mill is working to establish itself as a critical minerals hub in the U.S. Uranium is the fuel for carbon-free, emission-free baseload nuclear power – one of the cleanest forms of energy in the world; REEs are used to manufacture permanent magnets for electric vehicles (“ EVs ”), wind turbines and other clean energy and modern technologies. Energy Fuels produces both. Concurrently, the Company's recycling program (known as its “ Alternate Feed Program ”), works to reduce the levels of new production and natural disturbances needed to meet global energy demand by recycling feed sources that would have otherwise been lost to direct disposal and extracting additional valuable minerals from them. In short, through its uranium and REE production and long-standing recycling program, Energy Fuels works to help address global climate change by producing materials that ultimately reduce reliance on carbon dioxide (“ CO 2 ”) emitters, such as fossil fuels, while also ensuring that materials already extracted but only partially utilized are instead used to the fullest extent practicable so as to limit the global mining footprint and reduce the number of constituents ultimately disposed of. Additionally, certain radioisotopes, which the Company is evaluating for recovery from its uranium processing streams, have the potential to provide the isotopes needed for emerging TAT cancer-fighting therapeutics. As of December 31, 2023, the Company is a “development stage issuer” as defined by S-K 1300, as it is engaged in the preparation of Mineral Reserves for extraction of at least one material property. Mining Activities The Company's mining activities consist of the Mill, multiple conventional mining projects and an ISR mining project (complete with an ISR recovery facility on standby). The conventional mining projects are located on the Colorado Plateau, including the Pinyon Plain, Whirlwind, La Sal, Bullfrog, Arizona Strip and Roca Honda Projects, all of which are in the vicinity of the Mill, as well as the Sheep Mountain Project located in Wyoming and the Bahia Project (defined in Note 7 – Property, Plant and Equipment and Mineral Properties) located in Brazil. The Company's Nichols Ranch Project (including the Jane Dough and Hank Satellite deposits) is an ISR project located in Wyoming. As of December 31, 2023, the Company was performing rehabilitation and development work on its La Sal, Whirlwind and Pinyon Plain Projects, as well as exploration drilling and analysis at its Bahia Project. Other conventional mining projects in the vicinity of the Mill and Sheep Mountain are on standby and are being evaluated for continued mining and other activities and/or are in the process of being permitted. The Mill continues to receive third-party uranium-bearing mineralized materials from mining and other industry activities for its own processing and recycling, while also expanding its REE initiatives and pursuing its TAT cancer-fighting therapeutics initiatives.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“ U.S. GAAP ”) and are presented in thousands of U.S. dollars (“ USD ”), except for share and per share amounts. Certain footnote disclosures, where indicated, have share prices that are presented in Canadian dollars (“ Cdn$ ”). Use of Estimates The preparation of the Company’s consolidated financial statements in accordance with U.S. GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of expenses during the reporting period. The Company must make these estimates and assumptions because certain information used is dependent on future events, cannot be calculated with a high degree of precision from data available or simply cannot be readily calculated based on generally accepted methodologies. The more significant areas requiring the use of management estimates and assumptions relate to expectations of the future prices of uranium and REE as well as estimates of recoverable mineral resources that are the basis for future cash flow estimates utilized in assessing fair value for business combinations and impairment calculations; the determination of whether an acquisition represents a business combination or an asset acquisition; the use of management estimates and assumptions related to environmental, reclamation and closure obligations; marketable securities and derivative instruments; and share-based compensation expense. Actual results may differ significantly from these estimates. Principles of Consolidation These consolidated financial statements include the accounts of the Company together with subsidiaries controlled by the Company. Intercompany transactions, balances and unrealized gains and losses on transactions between the Company and its subsidiaries are eliminated. Management has evaluated how the Company is organized and managed and has identified that the Company is organized and managed as one segment. The functional currency of the Company’s operations is the USD. Extracting and Recovery Activities While in the Development Stage The Company extracts or recovers mineralized uranium from mining activities, mill tailings, pond solutions and Alternate Feed Materials, resulting in saleable uranium concentrates from its Mill and, when operating, its Nichols Ranch Project. While the Company has established the existence of multiple Mineral Resources and extracts and processes saleable uranium from these operations, the Company has only established proven or probable Mineral Reserves, as defined under SEC S-K 1300, at its Sheep Mountain and Pinyon Plain projects. Costs incurred before the establishment of proven and probable reserves are expensed and classified as development expense. As a result, the Company’s consolidated financial statements may not be directly comparable to the financial statements of mining companies in the development stage having multiple Mineral Reserves or in the production stage. Impairment of Long-Lived Assets The Company reviews and evaluates its long-lived assets for impairment when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Mineral properties are monitored for impairment based on factors such as mineral prices, government regulation and taxation, the Company's continued right to explore the area, exploration reports, assays, technical reports, drill results and its continued plans to fund exploration programs on the property. At each reporting date, the Company conducts a review of potential triggering events for all its mineral properties. When events or changes in circumstances indicate that the related carrying amounts may not be recoverable, the Company carries out a review and evaluation of its long-lived assets in accordance with its accounting policy. Impairment losses are recognized in profit or loss. Recoverability is measured by comparing the undiscounted future net cash flows to the net book value. When the net book value exceeds future net undiscounted cash flows, the fair value is compared to the net book value and an impairment loss may be measured and recorded based on the excess of the net book value over fair value. Fair value for operating mines is determined using a combined approach, which uses a discounted cash flow model for the existing operations and non-operating properties with available cash flow models and a market approach for the fair value assessment of non-operating and exploration properties where no cash flow model is available. Future cash flows are estimated based on quantities of recoverable mineralized material, expected uranium or REE prices (considering current and historical prices, trends and estimates), production levels, operating costs, capital requirements and reclamation costs, all based on life-of-mine plans. In estimating future cash flows, assets are grouped at the lowest level, for which there are identifiable cash flows that are largely independent of future cash flows from other asset groups. The Company's estimates of future cash flows are based on numerous assumptions, and it is possible that actual future cash flows will be significantly different than the estimates, as actual future quantities of recoverable minerals, uranium prices, production levels, costs and capital are each subject to significant risks and uncertainties. No impairment of property, plant and equipment and mineral properties were recorded during the years ended December 31, 2023, 2022 and 2021. Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents consist of all cash balances and highly liquid investments with an original maturity of three months or less. Because of the short maturity of these investments, the carrying amounts approximate their fair value. Restricted cash is excluded from cash and cash equivalents and is included in other current or long-term assets, depending on the nature of the restriction. See Note 8 – Asset Retirement Obligations and Restricted Cash for more information. Marketable Securities Marketable debt securities consist of excess cash invested in U.S. government notes, U.S. government agencies and tradeable certificates of deposits. The Company classifies and accounts for its marketable debt securities under the fair value option. After consideration of the Company's risk versus reward objectives, as well as its liquidity requirements, the Company may sell these debt securities prior to their stated maturities. As management views these securities as available to support current operations, the Company classifies highly liquid securities with maturities beyond 12 months as current assets under the caption Marketable securities on the Consolidated Balance Sheet. The Company received a secured convertible note (the “ Convertible Note ”) as partial consideration for the Alta Mesa Transaction (defined in Note 7 – Property, Plant and Equipment and Mineral Properties). The Company elected the fair value option for the Convertible Note, as it had the option of converting the principal due into fully paid and non-assessable common shares of enCore Energy Corp. (“ enCore ”). During the year ended December 31, 2023, the Convertible Note was partially redeemed and the remaining principal balance was sold. Subsequent to initial recognition, marketable debt securities are measured at fair value and changes therein are recognized as a component of Other income (loss) in the Consolidated Statements of Operations and Comprehensive Income (Loss). Marketable equity securities consist of investments in publicly traded equity securities. The Company classifies and accounts for its marketable equity securities as available-for-sale. Subsequent to initial recognition, marketable equity securities are measured at fair value and changes therein are recognized as a component of Other income (loss) in the Consolidated Statements of Operations and Comprehensive Income (Loss). Accounts Receivable Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The Company evaluates its estimate of expected credit losses based on historical experience and current and forecasted future economic conditions for each portfolio of customers. As of December 31, 2023 and 2022, the Company did not have an allowance for expected credit losses for trade accounts receivable. Inventories Inventories are valued at the lower of average cost or net realizable value. Net realizable value represents the estimated future sales price of the product based on current and long-term prices, less the estimated costs to bring the product to sale. Inventories are comprised of stockpiles or raw materials, work-in-process inventories and finished goods. Expenditures related to the extraction and recovery of uranium concentrates and depreciation of the acquisition cost of the Extracting and Recovery Operations are inventoried as stockpiles and in-process and concentrate inventories. Property, Plant and Equipment Recognition and measurement Property, plant and equipment is measured at cost less accumulated depreciation and any accumulated impairment losses. Costs include expenditures that are directly attributable to the acquisition of the asset. Subsequent costs are included in the asset’s carrying amount or recognized as a separate asset, when it is replaced, and the cost of the replacement asset is expensed. Depreciation Depreciation of property, plant and equipment is calculated using the straight-line method over the estimated useful lives less the salvage value of assets. The estimated useful lives of the Company's assets range from 3 to 15 years depending upon the asset type. Uncertainties that may impact these estimates of useful lives include, among others, changes in laws and regulations or changes in attitudes or interpretations of such laws and regulations relating to environmental matters, restoration and abandonment requirements, economic conditions and supply and demand for the Company’s services in the areas in which it operates. When assets are placed into service, management makes estimates with respect to useful lives and salvage values that it believes are reasonable. When assets are retired or sold, the resulting gains or losses are reflected in current earnings as a component of other income or expense. Salvage values, method of depreciation and useful lives of the assets are reviewed at least annually and any change in estimate is applied prospectively. Non-Operating Assets Non-operating assets consist of mineral properties and rights, along with data and analyses related to the properties, which are in various stages of evaluation and permitting. Costs to acquire the non-operating assets are capitalized at cost or fair value if such assets were acquired as part of a business combination. Mining activities for non-operating assets involve the search for minerals, the determination of technical feasibility and the assessment of commercial viability of an identified resource. Expenditures incurred in relation to such mining activities include costs which are directly attributable to researching and analyzing existing exploration data; conducting geological studies, exploratory drilling and sampling; examining and testing extraction and treatment methods; and completing pre-feasibility and feasibility studies. Such expenditures are expensed as incurred. Mineral properties, that are not held for production, and any related surface access to the minerals generally require periodic payments and/or certain expenditures related to the property in order for the Company to retain its interest in the mineral property (collectively, “ Holding Costs ”). The Company expenses all Holding Costs in the period they are incurred. Stand-by Properties Stand-by properties are mineral properties that have extracted mineral resources in the past but are currently non-operating or properties, which could extract mineral resources in the future. Expenditures related to these properties are primarily related to maintaining the assets and permits in a condition that will allow re-start of the operations or development given appropriate commodity prices. All costs related to stand-by assets are expensed as incurred. The Mill operates on a campaign basis. When the Mill is not recovering material, all related costs are expensed as incurred. Leases The Company accounts for leases under Financial Accounting Standards Board (the “ FASB ”) Accounting Standard Codification (“ ASC ”) Topic 842, Leases , which requires leases to be recognized as assets and liabilities on the balance sheet for the rights and obligations created by all leases with terms of more than 12 months. The Company recognizes in the balance sheet a liability to make lease payments (the lease liability) and the right-of-use asset representing the right to the underlying asset for the lease term. For leases with a term of twelve months or less, the Company has made an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. Investments Investments Accounted for at Fair Value The Company accounts for equity method investments over which the Company exerts significant influence, but not control, over the financial and operating policies through the fair value option of FASB ASC Topic 825, Financial Instruments . The Company elected the fair value option based on practical expedience, variances in reporting timelines and cost-benefit considerations. The cost of such investments is measured at the fair value of the assets given up, shares issued and liabilities assumed at the date of acquisition plus costs directly attributable to the acquisition. Subsequent to initial recognition, they are measured at fair value. The fair value of the investee’s common shares is measured based on its closing market price. The Company uses the Black-Scholes option pricing model to estimate the fair value of its investment in warrants with the following assumptions: (i) the investee’s closing market price on the valuation date, (ii) the risk-free interest rate computed based on the U.S. Treasury yield, (iii) an expected term equal to the remaining contractual term, (iv) a dividend yield of zero, and (v) the expected stock price volatility calculated based on the historical volatility of the common shares of the investee. Changes in the fair value of these investments are recognized in Other income (loss) in the Company’s Consolidated Statements of Operations and Comprehensive Income (Loss). See Note 6 – Investments for more information. Investments Without a Readily Determinable Fair Value The Company measures equity investments without readily determinable fair values at cost, less any impairment, adjusted for observable price changes from orderly transactions for identical or similar investments of the same issuer. See Note 6 – Investments for more information. Asset Retirement Obligations The Company’s asset retirement obligations (“ ARO ”) relate to expected mine, wellfield, plant and mill reclamation and closure activities, as well as costs associated with reclamation of exploration drilling. The Company’s activities are subject to numerous governmental laws and regulations. Estimates of future reclamation liabilities for ARO are recognized in the period when such liabilities are incurred. These estimates are updated on a periodic basis and are subject to changing laws, regulatory requirements, technology and other factors, which will be recognized when appropriate. Liabilities related to site restoration include long-term treatment and monitoring costs and incorporate total expected costs net of recoveries. Expenditures incurred to dismantle facilities, restore and monitor closed resource properties are charged against the related ARO. The present value of AROs is measured by discounting the expected cash flows using a discount factor that reflects the credit-adjusted risk-free rate of interest, while taking into account an inflation rate. The ARO liability is accreted to full value over time through periodic accretion charges recorded to operations as accretion expense. The Company adjusts the estimate of the ARO for changes in the amount or timing of underlying future cash outflows. The impact of these adjustments to the ARO amounts are expensed as incurred. Warrant Liabilities The Company issued several tranches of warrants for various equity transactions in 2016 all of which were either settled or expired in 2021 and thus, no longer outstanding as of December 31, 2022 and 2023. The Company accounted for its warrants issued in accordance with FASB ASC Topic 815, Derivative and Hedging (“ ASC 815 ”), which required instruments within its scope to be recorded on the balance sheet as either an asset or liability measured at its fair value, with changes in fair value recognized in earnings. In accordance with ASC 815, the Company classified the warrants as liabilities. The warrants were subject to re-measurement at each balance sheet date, with any change in fair value recognized as a component of Other income (loss) in the Consolidated Statements of Operations and Comprehensive Income (Loss). The Company estimated the fair value of these warrants using market prices, if available, or the Black-Scholes option pricing model. The Black-Scholes option pricing model is based on the estimated market value of the underlying common stock at the measurement date, the remaining contractual term of the warrant, risk-free interest rates and expected dividends on, and expected volatility of the price of the underlying common stock. Revenue Sale of goods Revenue from the sale of mineral concentrates is recognized when control transfers to customers at amounts to which the Company expects to be entitled. For uranium concentrates, revenue is typically recognized when delivery is evidenced by book transfer at the applicable uranium storage facility. For vanadium concentrates, revenue is typically recognized when delivery is evidenced by book transfer at the applicable vanadium storage facility. For RE Carbonate, revenue is typically recognized when delivery of the mixed RE Carbonate material has arrived at the applicable separations facility. Rendering of services Revenue from the delivery of mineralized material received from the clean-up of a third-party uranium mine or for other Alternate Feed Materials is typically recognized upon delivery to the White Mesa Mill. Revenue from toll milling services is recognized as material is processed in accordance with the specifics of the applicable toll milling agreement. Revenue and unbilled accounts receivable are recorded as related costs are incurred using billing formulas included in the applicable toll milling agreement. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from revenue. Share-Based Compensation The Company measures share-based compensation awards exchanged for director, employee and contractor services at fair value on the date of the grant and expenses the awards in the Consolidated Statements of Operations and Comprehensive Income (Loss) over the requisite employee service period. The fair value of restricted stock units (“ RSUs ”) is based on the Energy Fuels’ closing stock price on the date of grant. The fair value of stock appreciation rights (“ SARs ”) with market conditions is based on a Monte Carlo simulation performed by a third-party valuation firm. The fair value of stock options is determined using the Black-Scholes valuation model. Share-based compensation expense related to awards with only service conditions having a graded vesting schedule is recorded on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in substance, multiple awards, while expense for all other awards are recognized on a straight-line basis. The Company’s estimates may be impacted by certain variables including, but not limited to, stock price volatility, employee stock option exercise behaviors, additional stock option grants, the Company's performance and related tax impacts. Foreign Currency Transactions in foreign currencies are translated to the respective functional currency of the Company’s subsidiaries and joint ventures at exchange rates at the dates of the transactions. Monetary assets and liabilities denominated in foreign currencies are translated to the functional currency at the exchange rate as of the reporting date. Non-monetary assets and liabilities that are measured at fair value in a foreign currency are translated to the functional currency at the exchange rate when the fair value was determined. Foreign currency differences are generally recognized in profit or loss. Non-monetary items that are measured based on historical cost in a foreign currency are not translated. The assets and liabilities of entities whose functional currency is not the U.S. dollar are translated into the U.S. dollar at the exchange rate as of the reporting date. The income and expenses of such entities are translated into the U.S. dollar using average exchange rates for the reporting period. Exchange differences on foreign currency translations are recorded in Other comprehensive income (loss). The Company’s functional currency is the U.S. dollar. Income Taxes The Company uses the asset and liability method of accounting for income taxes. Under this method, deferred income tax assets and liabilities are recorded based on differences between the financial statement carrying values of existing assets and liabilities and their respective income tax bases (temporary differences), and losses carried forward. Deferred income tax assets and liabilities are measured using the enacted tax rates which will be in effect when the temporary differences are likely to reverse. The effect on deferred income tax assets and liabilities of a change in tax rates is included in operations in the period in which the change is enacted. The Company records a valuation allowance to reduce deferred income tax assets to the amount that is believed more likely than not to be realized. When the Company concludes that all or part of the deferred income tax assets are not realizable in the future, the Company makes an adjustment to the valuation allowance that is charged to income tax expense in the period such determination is made. Net Income (Loss) per Share The Company presents basic income (loss) per share data for its common shares, calculated by dividing the income (loss) attributable to common shareholders of the Company by the weighted average number of common shares outstanding during the period. Diluted income (loss) per share is determined by adjusting the income (loss) attributable to common shareholders and the weighted average number of common shares outstanding for the effects of all potential dilutive instruments based on the number of common shares that would be issuable if the end of the period was also the end of the performance period required for the vesting of the awards. Potentially dilutive instruments include stock options, restricted stock units, stock appreciation rights and warrants, which are included in the diluted income (loss) per share calculation using the treasury stock method. Recently Issued Accounting Standards Segment Reporting In November 2023, the FASB issued Accounting Standard Update (“ ASU ”) 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” This ASU requires annual and interim disclosures about significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss as well as the amount and composition of other segment items. The Company will adopt this standard prospectively on January 1, 2024 and does not expect a material impact on the Company's consolidated financial statements. Income Tax Disclosures On December 14, 2023, the FASB issued ASU 2023-09, “Improvements to Income Tax Disclosures.” This ASU requires disaggregated information about a reporting entity’s effective tax rate reconciliation, as well as information on income taxes paid. The standard is intended to benefit investors by providing more detailed income tax disclosures that would be useful in making capital allocation decisions. The Company will adopt this standard prospectively on January 1, 2025 and does not expect a material impact on the Company's consolidated financial statements.

MARKETABLE SECURITIES

MARKETABLE SECURITIES	12 Months Ended
MARKETABLE SECURITIES	Dec. 31, 2023
Cash and Cash Equivalents [Abstract]
MARKETABLE SECURITIES	MARKETABLE SECURITIES The Company has elected the fair value option for its marketable debt securities and records these instruments on the Consolidated Balance Sheet at their fair value including interest income. Changes in fair value and interest income are recorded in Other income (loss) in the Consolidated Statements of Operations and Comprehensive Income (Loss). The fair value option was elected for these marketable debt securities as the Company may sell them prior to their stated maturities after consideration of the Company's risk versus reward objectives as well as its liquidity requirements. The stated contractual maturity dates of marketable debt securities held as of December 31, 2023 and 2022 are due in one to two years. Marketable equity securities are measured at fair value as of each reporting date, and realized and unrealized gains (losses) and interest income are recorded in Other income (loss) in the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss). The following table summarizes our marketable securities by significant investment categories: Cost Basis Gross Unrealized Losses Gross Unrealized Gains Fair Value December 31, 2023 Marketable debt securities (1) $ 106,791 $ — $ 675 $ 107,466 Marketable equity securities 28,159 (2,581) — 25,578 Total marketable securities $ 134,950 $ (2,581) $ 675 $ 133,044 December 31, 2022 Marketable debt securities (1) $ 11,435 $ (310) $ — $ 11,125 Marketable equity securities 2,876 (1,809) — 1,067 Total marketable securities $ 14,311 $ (2,119) $ — $ 12,192 (1) As of December 31, 2023 and 2022, marketable debt securities are comprised primarily of U.S. Treasury Bills and Government Agency Bonds.

RECEIVABLES

RECEIVABLES	12 Months Ended
RECEIVABLES	Dec. 31, 2023
Receivables [Abstract]
Receivables	RECEIVABLES The components of trade and other receivables are as follows: December 31, 2023 2022 Trade receivables $ 406 $ 92 Notes receivable, net 343 343 Other 67 84 Total receivables $ 816 $ 519 During the year ended December 31, 2014, the Company received two notes with a combined principal totaling $1.05 million due in 2018 in connection with the sale of certain assets previously recorded as held for sale. The note with principal totaling $0.50 million was collected during the year ended December 31, 2018. Alternatively, the note with a principal payment of $0.55 million due November 7, 2018 was not paid and the Company notified the issuing party (“ Default Party ”) of its default on November 9, 2018. The Company has an allowance for credit losses of $0.22 million as of December 31, 2023 and 2022 against the collectability of this note. The promissory note is secured by all issued and outstanding stock of the Default Party and all of the assets sold to the Default Party.

INVENTORIES

INVENTORIES	12 Months Ended
INVENTORIES	Dec. 31, 2023
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consisted of the following items: December 31, 2023 2022 Concentrates and work-in-progress $ 35,807 $ 35,476 Inventory of ore in stockpiles 3,072 940 Raw materials and consumables 1,841 4,204 Total inventories $ 40,720 $ 40,620

INVESTMENTS ACCOUNTED FOR AT FA

INVESTMENTS ACCOUNTED FOR AT FAIR VALUE	12 Months Ended
INVESTMENTS ACCOUNTED FOR AT FAIR VALUE	Dec. 31, 2023
Fair Value Disclosures [Abstract]
INVESTMENTS ACCOUNTED FOR AT FAIR VALUE	INVESTMENTS As of December 31, 2022, the Company owned a 17.4% interest in Consolidated Uranium Inc. (“ CUR ”) and a 13.5% interest in Virginia Energy Resources, Inc. (“ Virginia Energy ”). The Company had significant influence, but not control, over these investments. As such, Virginia Energy and CUR were accounted for as equity method investments with the fair value option elected and classified as Investments on the Consolidated Balance Sheet. Changes in value of these investments are included in Other income (loss) in the Consolidated Statement of Operations and Comprehensive Income (Loss). For the years ended December 31, 2023, 2022 and 2021, the Company had a net unrealized gain of $4.98 million, an unrealized loss of $16.81 million and a unrealized gain of $6.31 million, respectively. On January 24, 2023, CUR acquired 100% of the issued and outstanding common shares of Virginia Energy in for 0.26 common shares of CUR for every one common share of Virginia Energy. As a result, the Company’s 9,439,857 common shares of Virginia Energy were converted into 2,454,362 million common shares of CUR (the “ Conversion ”). Following the Conversion, the Company owned 16,189,548 common shares of CUR, which represented an ownership interest of 16.7% in CUR as of closing. On December 5, 2023, IsoEnergy Ltd. (“ IsoEnergy ”) acquired all of the issued and outstanding common shares of CUR (the “ CUR Shares ”). Pursuant to the arrangement, CUR’s shareholders received 0.500 common shares of IsoEnergy for every CUR Share. When converted, the Company's CUR Shares results in an approximate ownership interest in IsoEnergy of 5.0%. On October 19, 2023, IsoEnergy completed its marketed private placement offering of 8,134,500 subscription receipts of IsoEnergy (the “ Subscription Receipts ”) at a price of Cdn$4.50 per Subscription Receipt; in order to retain its post-arrangement ownership interest in IsoEnergy, the Company purchased 406,650 Subscription Receipts for Cdn$1.83 million. Each outstanding Subscription Receipt has been converted into one common share of IsoEnergy. Following completion of this arrangement, the Company owned 8,501,424 shares of IsoEnergy for an approximate ownership interest of 5.0% as of December 5, 2023. Upon completion of this arrangement, the Company does not have significant influence over IsoEnergy as a result of no representation on the Board of Directors of IsoEnergy and its reduced ownership interest. Therefore, the investment is no longer accounted for as an equity method investment. The Company's judgment regarding the level of influence over its equity method investments includes considering key factors such as the Company's ownership interest, representation on the Board of Directors and participation in the policy-making decisions of equity method investees. As such, the Company's shares in IsoEnergy are accounted for as marketable securities with the fair value option elected on its Consolidated Balance Sheet and changes in value are included in Other income (loss) in the Consolidated Statement of Operations and Comprehensive Income (Loss). CUR As of December 5, 2023 and December 31, 2022, the fair value of the Company’s investment in CUR was $23.63 million and $16.50 million, respectively. Pursuant to Rule 3-09 of Regulation S-X (“ Rule 3-09 ”), the Company is required to file separate audited financial statements of CUR if either the investment test or income test as set forth in that rule equals or exceeds the 20% level individually. As of December 31, 2022, the income test was met at the 20% significance level for CUR. The Company will amend this Annual Report to include as an exhibit the separate audited financial statements for the year ended December 31, 2022 and unaudited financial statements for the period ending December 5, 2023. In accordance with Rule 4-08(g) of Regulation S-X (“ Rule 4-08(g) ”), the summarized financial information for CUR is set forth below on a one-quarter lag, which precedes the date of the Company’s investment for the year ended December 31, 2021. CUR prepares its financial statements in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board (“ IFRS ”) and uses Cdn$ as its reporting currency. As such, the Company has made certain adjustments to CUR’s summarized financial information to address differences between IFRS and GAAP that materially impact the summarized financial information and to convert such information to US$. September 30, 2023 2022 Current assets $ 7,522 $ 16,586 Non-current assets $ 31,717 $ 17,437 Current liabilities $ 3,589 $ 2,285 Non-current liabilities $ 319 $ — Twelve Months Ended September 30, 2023 2022 2021 Loss from continuing operations $ (8,817) $ (23,103) $ (4,253) Net loss and net loss attributable to the entity $ (8,902) $ (17,890) $ (4,570) Virginia Energy The fair value of the Company's investment in Virginia Energy was $3.39 million and $2.83 million as of January 24, 2023 and December 31, 2022, respectively. Pursuant to Rule 3-09, the Company is required to file separate audited financial statements of Virginia Energy if either the investment test or income test as set forth in that rule equals or exceeds the 20% level individually. As of December 31, 2021, the income test was met at the 20% significance level for Virginia Energy. Exhibit 99.1 to this Annual Report includes separate audited financial statements for the year ended December 31, 2021 and unaudited financial statements for the twenty-three day period ended January 23, 2023 and the year ended December 31, 2022 of Virginia Energy. In accordance with Rule 4-08(g), summarized financial information for Virginia Energy is set forth below on a one-quarter lag. Virginia Energy prepares its financial statements in accordance with IFRS. The Company determined that no adjustments to Virginia Energy’s summarized financial information were necessary to address differences between IFRS and GAAP that materially impact the summarized financial information. January 23, 2023 September 30, 2022 Current assets $ 133 $ 163 Non-current assets $ 4,253 $ 3,753 Current liabilities $ 2 $ 223 Non-current liabilities $ 2 $ 2 For the Period October 1, 2022 to January 23, 2023 Twelve Months Ended September 30, 2022 2021 Loss from continuing operations, net loss and net loss attributable to the entity $ (226) $ (371) $ (275) Assets and Liabilities Measured at Fair Value on a Recurring Basis Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Fair value accounting utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 – Quoted prices in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; and Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity). The Company’s financial instruments include cash, restricted cash, accounts receivable, accounts payable and current accrued liabilities. These instruments are carried at cost, which approximates fair value due to the short-term maturities of the instruments. Allowances for doubtful accounts are recorded against the accounts receivable balance to estimate net realizable value. As of December 31, 2023 and 2022, the fair values of cash, restricted cash, short-term deposits, receivables, accounts payable and accrued liabilities approximate their carrying values because of the short-term nature of these instruments. The Company’s investments in marketable equity securities are publicly traded stocks measured at fair value and classified within Level 1 and Level 2 in the fair value hierarchy. Level 1 marketable equity securities use quoted prices for identical assets in active markets, while Level 2 marketable equity securities utilize inputs based upon quoted prices for similar instruments in active markets. The Company’s investments in marketable debt securities are valued using quoted prices of a pricing service and as such, are classified within Level 2 of the fair value hierarchy. The Company’s investments include certain investments accounted for at fair value consisting of Common Shares are valued using quoted market prices in active markets and as such are classified within Level 1 of the fair value hierarchy. The Company’s investments include certain investments accounted for at fair value consisting of warrants are valued using the Black-Scholes option model based on observable inputs and as such are classified within Level 2 of the hierarchy. The Convertible Note received as part of the Alta Mesa Transaction was valued as of February 14, 2023, upon closing, using a binomial lattice model. The fair value calculation uses significant unobservable inputs, including: (i) volatility 60%, and (ii) yield of 9.5%. Increases or decreases in the volatility and/or the selected yield can result in an increase or decrease in the fair value of the Convertible Note. Between February 14, 2023 and November 3, 2023, enCore early redeemed $40.00 million of the principal value of the Convertible Note. On November 9, 2023, the Company sold the remaining unpaid balance of $20 million owed under the secured Convertible Note for total consideration of $21.00 million plus $1.50 million in unpaid accrued interest, less a sales commission of $100,000 paid to a third-party broker. As a result of enCore’s earlier pay-down and the $22.40 million received in connection with the sale of the Convertible Note, the Company has now received payment in full for the Alta Mesa Transaction, and no further consideration is owed in connection therewith. The following tables set forth the fair value of the Company’s assets and liabilities measured at fair value on a recurring basis (at least annually) by level within the fair value hierarchy. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Level 1 Level 2 Level 3 Total December 31, 2023 Cash equivalents (1) $ — $ 40,512 $ — $ 40,512 Marketable equity securities 25,554 24 — 25,578 Marketable debt securities — 107,466 — 107,466 $ 25,554 $ 148,002 $ — $ 173,556 December 31, 2022 Cash equivalents (1) $ — $ 30,336 $ — $ 30,336 Investments accounted for at fair value 19,263 66 — 19,329 Marketable equity securities 1,033 34 — 1,067 Marketable debt securities — 11,125 — 11,125 $ 20,296 $ 41,561 $ — $ 61,857 (1) Cash and cash equivalents are comprised of U.S. Treasury Bills, Government Agency Bonds, U.S. Non-Redeemable Term Deposits and mutual funds purchased within three months of their maturity date. Changes in Level 3 Fair Value Measurements The following table is a reconciliation of the beginning and ending balance recorded for the Convertible Note classified as Level 3 in the fair value hierarchy: Beginning balance, February 14, 2023 $ 59,457 Principal redeemed and sale (60,887) Realized gain included in other income (loss) 1,430 Ending balance, December 31, 2023 $ —

PROPERTY, PLANT AND EQUIPMENT A

PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES	12 Months Ended
PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Plant and Equipment and Mineral Properties	PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES The following is a summary of property, plant and equipment, net: Estimated December 31, Useful Lives 2023 2022 Land N/A $ 642 $ 642 Plant facilities 12 - 15 years 29,750 29,509 Mining equipment 5 years 13,019 10,560 Light trucks and utility vehicles 5 years 3,256 2,867 Office furniture and equipment 4 - 7 years 1,754 1,585 Construction-in-progress N/A 13,627 673 Total property, plant and equipment $ 62,048 $ 45,836 Less: accumulated depreciation (35,925) (33,174) Property, plant and equipment, net $ 26,123 $ 12,662 As of December 31, 2022, the net book value of the property, plant and equipment attributable Alta Mesa, which the Company sold to enCore effective February 14, 2023, was $8.21 million and is included in Property, plant and equipment and other assets held for sale, net on the Consolidated Balance Sheet. For the years ended December 31, 2023, 2022 and 2021, the Company recognized depreciation expense of $2.75 million, $3.27 million and $3.19 million, respectively, in Exploration, development and processing and Standby in the Consolidated Statements of Operations and Comprehensive Income (Loss) . For the years ended December 31, 2023, 2022 and 2021, the Company capitalized $0.10 million, $0.24 million and $0.10 million, respectively, of depreciation expense related to the Mill that was included in the capitalized costs to inventory on the Consolidated Balance Sheet. The following is a summary of mineral properties: December 31, 2023 2022 Sheep Mountain $ 34,183 $ 34,183 Bahia Project 29,130 — Nichols Ranch ISR Project 25,974 25,974 Roca Honda 22,095 22,095 Pinyon Plain 6,512 — Other 1,687 1,287 Mineral properties total $ 119,581 $ 83,539 Bahia Project On February 10, 2023, the Company closed on two purchase agreements to acquire a total of 17 mineral concessions in the State of Bahia, Brazil totaling approximately 37,300 acres or 58.3 square miles (the “ Bahia Project ”). Under the terms of the purchase agreements, the Company entered into mineral rights transfer agreements with the sellers to acquire the 17 heavy mineral sands concessions. The total purchase price under the purchase agreements was $27.50 million, which consisted of deposit payments of $5.90 million due upon reaching certain stipulated milestones and the remaining $21.60 million due at closing. Upon final payment on February 10, 2023, the transfer and assignment of the mineral rights was completed (the “ Bahia Closing ”). Additionally, the Company incurred direct deal costs related to such asset acquisitions of $1.63 million. The purchase deposit payments and direct transaction costs were capitalized as Prepaid expenses and other current assets in the Consolidated Balance Sheet as of December 31, 2022 and reclassified to Mineral properties upon closing within the Consolidated Balance Sheet. The Bahia Closing followed the Brazilian Government's approval of the transfers to Energy Fuels' wholly owned Brazilian subsidiary Energy Fuels Brazil Ltda. Alta Mesa Transaction On February 14, 2023, the Company closed on its sale to enCore of three wholly-owned subsidiaries that together held Alta Mesa, which was classified as “held for sale” on the Consolidated Balance Sheet as of December 31, 2022, for total consideration of $120 million (the “ Alta Mesa Transaction ”), paid as follows: a. $60 million in cash, which included $6 million prior to closing and $54 million at closing; and b. $60 million Convertible Note, payable in two years from the closing, bearing annual interest of eight percent (8%). The Convertible Note is convertible at Energy Fuels’ election into fully paid and non-assessable enCore common shares at a conversion price of $2.9103 per share, being a 20% premium to the 10-day volume-weighted average price of enCore shares ending the day before the Closing (the “Conversion Option”). enCore is currently traded on the TSX-V and NYSE American. The Convertible Note is guaranteed by enCore and fully secured by Alta Mesa. Unless a block trade or similar distribution is executed by Energy Fuels to sell the enCore common shares received on conversion of the Convertible Note, Energy Fuels will be limited to selling a maximum of $10 million of enCore common shares per thirty (30)-day period. The Company recognized a gain on sale of assets from the Alta Mesa Transaction of $116.50 million, which is calculated as the total fair value of the consideration received of $119.46 million consisting of $60 million in cash and the Convertible Note with a fair value of $59.46 million, less the net book value attributable to the Alta Mesa assets and liabilities after working capital adjustments of $3.40 million, net of transaction costs. Receipt of the Convertible Note represents a non-cash investing activity at its initial fair value. See Note 15 – Fair Value Accounting for more information on the fair value of the Convertible Note. As a post-closing condition of the Alta Mesa Transaction, enCore was required to replace the $3.59 million of reclamation bonds then in place for Alta Mesa. Upon replacement, the original bonds were released and the Company received back the underlying collateral during the year ended December 31, 2023. The Company reclassified $3.59 million cash as a release of collateral from those bonds from Property, plant and equipment and other assets held for sale, net to cash and cash equivalents on its Condensed Consolidated Balance Sheets. In connection with the Alta Mesa Transaction, on May 3, 2023, the Company completed the sale of its Prompt Fission Neutron assets, including the underlying contracts, technology, licenses and intellectual property (collectively, the “ PFN Assets ”), to enCore in exchange for cash consideration received at closing of $3.10 million, which resulted in a gain Disposal of Certain Properties On July 15, 2021, the Company and CUR jointly announced the signing of a definitive asset purchase agreement (the “ Agreement ”) for CUR to acquire a portfolio of the Company's non-core conventional uranium projects located in Utah and Colorado, including the Daneros mine, the Tony M mine, the Rim mine, the Sage Plain project, and several U.S. Department of Energy leases (the “ Sale ”). On October 27, 2021 (the “ Closing Date ”), the parties closed the Sale in accordance with the terms of the Agreement, as a result of which the aforementioned properties and leases were transferred to CUR in exchange for the following consideration: • $2,000,000 in cash on the Closing Date; • the issuance of 11,860,101 common shares of CUR, constituting 19.9% of the outstanding CUR common shares immediately after the Closing Date, at a price per share of Cdn$2.95 equal to the closing price of the CUR common shares on the TSXV on the last trading day immediately prior to issuance; • an additional Cdn$3,000,000 in cash payable on or before the 18-month anniversary of the Closing Date (“ Second Payment ”); • an additional Cdn$3,000,000 in cash payable on or before the 36-month anniversary of the Closing Date (“ Third Payment ” and together with the Second Payment, the “ Deferred Cash Payments ”); and • the commitment to make production payments on a per-project basis totaling Cdn$5,000,000 as set forth pursuant to individual production payment agreements executed on the Closing Date. As part of the Agreement, the Company has entered into a mine operating agreement pursuant to which it will act, through its indirect wholly owned subsidiary Energy Fuels Resources (USA) Inc., as Operator to the Sale projects in accordance with a program and budget determined annually, in exchange for which the Company will receive reimbursement for all direct costs in addition to an overhead allocation and management fee. In addition, the Company has entered into a toll milling agreement pursuant to which it will process all ore mined from the properties at the Mill, in exchange for which the Company will receive reimbursement of direct costs in addition to a milling fee. Pursuant to an investor rights agreement, for so long as the Company’s equity ownership in CUR remains at or above 10%, it will be entitled to equity participation rights to maintain its pro-rata equity ownership in the Company and to appoint one nominee to the CUR Board of Directors. The Company’s CEO was appointed to the CUR Board of Directors at the Closing Date. These non-core conventional uranium project assets had no carrying value at the Closing Date. The Company recognized a gain on the disposal of $35.73 million at the Closing Date and subsequently derecognized asset retirement obligations of $0.27 million prior to December 31, 2021 upon being legally released from being the primary obligor under the liabilities. For a period of three years, if CUR issues common shares or other securities convertible into common shares in a private placement or prospectus offering, the Company has the right to accelerate a portion of the Deferred Cash Payments, in cash or securities, up to a maximum amount equal to the product of (i) the gross proceeds of the financing multiplied by (ii) the Company’s then current cumulative percentage ownership of CUR common stock on a non-diluted basis prior to the completion of the financing (the “ Acceleration Right

ASSET RETIREMENT OBLIGATIONS AN

ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH	12 Months Ended
ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH	Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations and Restricted Cash	ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH Asset Retirement Obligations The following table summarizes the Company’s asset retirement obligations: December 31, 2023 2022 Asset retirement obligations, beginning of period $ 9,595 $ 13,687 Revision of estimate 214 (238) Accretion of liabilities 1,192 1,556 Held for sale (1) — (5,410) Disposal of Alta Mesa asset retirement obligations (1) (79) — Asset retirement obligations, end of period $ 10,922 $ 9,595 (1) Asset retirement obligations held for sale as of December 31, 2022 were related to Alta Mesa and are included as Asset retirement obligation and other liabilities held for sale on the Consolidated Balance Sheet. Disposal of Alta Mesa retirement obligations is related to the accretion expense incurred on these obligations through the closing date and is included within Gain on sale of assets on the Consolidated Statements of Operations and Comprehensive Income (Loss). See Note 7 – Property, Plant and Equipment and Mineral Properties for more information. The Company’s asset retirement obligations are subject to legal and regulatory requirements. Estimates of the costs of reclamation are reviewed periodically by the Company and the applicable regulatory authorities. The above provision represents the Company’s estimate of the present value of future reclamation costs, discounted using credit adjusted risk-free interest rates ranging from 11.62% to 12.88% and inflation rates ranging from 2.25% to 3.97%. The total undiscounted decommissioning liability as of December 31, 2023 and 2022 is $33.38 million and $42.91 million, respectively. The upward revision of estimate of $0.21 million for the year ended December 31, 2023 includes net changes in estimated costs of future reclamation activities. These revisions were recognized in Property, plant and equipment, net on the Consolidated Balance Sheet and will be depreciated over the useful life of the related asset. The downward revision of estimate of $0.24 million for the year ended December 31, 2022 includes net changes in estimated costs of future reclamation activities. These revisions were recognized in Exploration, development, permitting, and land holding and Standby costs in the Consolidated Statement of Operations and Comprehensive Income (Loss). Restricted Cash The Company has cash, cash equivalents and fixed income securities as collateral for various bonds posted in favor of the applicable state regulatory agencies in Arizona, Colorado, New Mexico, Texas, Utah and Wyoming, and the U.S. Bureau of Land Management and U.S. Forest Service for estimated reclamation costs associated with the White Mesa Mill, Nichols Ranch, Alta Mesa and other mining properties. The restricted cash will be released when the Company has reclaimed a mineral property, sold a mineral property to a party having assumed the applicable bond requirements or restructured the surety and collateral arrangements. See Note 14 – Commitments and Contingencies for more information. The following table summarizes the Company’s restricted cash: December 31, 2023 2022 Restricted cash, beginning of period $ 17,449 $ 20,305 Additional collateral posted 130 734 Held for sale — (3,590) Restricted cash, end of period $ 17,579 $ 17,449

CAPITAL STOCK

CAPITAL STOCK	12 Months Ended
CAPITAL STOCK	Dec. 31, 2023
Stockholders' Equity Note [Abstract]
Capital Stock	CAPITAL STOCK Authorized Capital Stock The Company is authorized to issue an unlimited number of Common Shares without par value, unlimited Preferred Shares issuable in series and unlimited Series A Preferred Shares. The Preferred Shares issuable in series will have the rights, privileges, restrictions and conditions assigned to the particular series upon the Board of Directors approving their issuance. The Series A Preferred Shares issuable are non-redeemable, non-callable, non-voting and have no right to dividends. Issued Capital Stock During the years ended December 31, 2023, 2022 and 2021, the Company issued 4,047,832, 769,779 and 16,627,512 Common Shares, respectively, under its ATM offering for net proceeds of $31.81 million, $7.89 million and $106.21 million, respectively. Share Purchase Warrants The following table summarizes the Company’s share purchase warrants denominated in U.S. dollars. These warrants are accounted for as derivative liabilities, as the functional currency of the entity issuing the warrants, Energy Fuels Inc., is Cdn$. Month Issued Expiry Date Exercise Price Warrants Fair value as of December 31, 2023 September 2016 (1) September 20, 2021 $ 2.45 — $ — (1) The warrants issued in September 2016 were classified as Level 1 under the fair value hierarchy. Each warrant was exercisable until September 20, 2021 and entitled the holder thereof to acquire one common share upon exercise at an exercise price of $2.45 per common share. These warrants are accounted for as a derivative liability, as the functional currency of the entity issuing the warrant is Cdn$.

BASIC AND DILUTED INCOME (LOSS)

BASIC AND DILUTED INCOME (LOSS) PER COMMON SHARE	12 Months Ended
BASIC AND DILUTED INCOME (LOSS) PER COMMON SHARE	Dec. 31, 2023
Earnings Per Share [Abstract]
Basic and Diluted Income (Loss) Per Common Share	BASIC AND DILUTED INCOME (LOSS) PER COMMON SHARE The following is a reconciliation of weighted average common shares outstanding: Years Ended December 31, 2023 2022 2021 Issued shares at beginning of period 157,682,531 156,262,199 134,311,033 Effect of stock options exercised 105,819 155,509 474,072 Effect of shares issued for settlement of vesting of restricted stock units 290,390 335,546 443,364 Effect of shares issued for settlement of exercises of stock appreciation rights 120,291 2,679 2,316 Effect of shares issued for exercise of share purchase warrants — — 1,737,981 Effect of shares issued for consulting services 42,202 16,064 35,933 Effect of shares issued in public offerings 865,806 571,253 9,899,825 Weighted average common shares outstanding 159,107,039 157,343,250 146,904,524 Basic and diluted income (loss) per common share The calculation of basic and diluted income (loss) per share after adjustment for the effects of all potential dilutive common shares, calculated as follows: Years Ended December 31, 2023 2022 2021 Net income (loss) attributable to owners of the Company $ 99,862 $ (59,849) $ 1,541 Basic weighted average common shares outstanding 159,107,039 157,343,250 146,904,524 Dilutive impact of stock options, restricted stock units, and warrants 1,047,001 — 2,816,593 Diluted weighted average common shares outstanding 160,154,040 157,343,250 149,721,117 Basic net income (loss) per common share $ 0.63 $ (0.38) $ 0.01 Diluted net income (loss) per common share $ 0.62 $ (0.38) $ 0.01 For the years ended December 31, 2023, 2022 and 2021, 0.11 million, 0.06 million and 6.87 million stock options, restricted stock units, and warrants, respectively, and the potential conversion of the Convertible Debentures have been excluded from the calculation of diluted net income (loss) per common share as their effect would have been anti-dilutive. In addition, the Company excluded stock appreciation rights of 1.85 million, 2.45 million, and 1.67 million for the years ended December 31, 2023, 2022, and 2021, respectively as they are contingently issuable based on specified market prices of the Company’s stock which were not achieved as of the end of each period.

SHARE-BASED PAYMENTS

SHARE-BASED PAYMENTS	12 Months Ended
SHARE-BASED PAYMENTS	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Share-Based Payments	SHARE-BASED COMPENSATION The Company maintains an equity incentive plan, known as the 2021 Amended and Restated Omnibus Equity Incentive Compensation Plan (the “ Compensation Plan ”), for directors, executives, eligible employees and consultants. Existing equity incentive awards include employee non-qualified stock options, RSUs and SARs. The Company issues new Common Shares to satisfy exercises and vesting under its equity incentive awards. As of December 31, 2023, a total of 16,265,915 common shares were authorized for future equity incentive plan awards. The Company’s share-based compensation expense, by type of award, is as follows: Years Ended December 31, 2023 2022 2021 RSUs (1) $ 2,595 $ 2,244 $ 1,562 SARs 1,583 2,038 273 Stock options 447 359 323 Total share-based compensation expense (2) $ 4,625 $ 4,641 $ 2,158 (1) The fair value of the RSUs granted under the Compensation Plan for the years ended December 31, 2023, 2022 and 2021 was estimated at the date of grant, using the stated market price on the NYSE American. (2) Share-based compensation is recorded in Selling, general and administration in the Consolidated Statements of Operations and Comprehensive Income (Loss). As of December 31, 2023, there were $0.19 million, $0.84 million and $0.31 million of unrecognized compensation costs related to the unvested stock options, RSU awards and SARs, respectively, to be recognized over a weighted average period of 1.03 years, 1.87 years, and 0.67 years, respectively. Restricted Stock Units The Company grants RSUs to directors, executives and eligible employees. Awards for executives and eligible employees are determined as a target percentage of base salary and generally vest over three years. Holders of unvested RSUs do not have voting rights on those RSUs. The RSUs are subject to forfeiture risk and other restrictions. Upon vesting, the employee is entitled to receive one Common Share of the Company for each RSU at no additional payment. A summary of the Company’s RSU unvested activity is as follows: Number of Shares Weighted Average Grant Date Fair Value Unvested, December 31, 2020 1,094,056 $ 1.98 Granted 441,241 3.89 Vested (635,233) 1.94 Forfeited — — Unvested, December 31, 2021 900,064 $ 2.94 Granted 411,467 6.52 Vested (518,856) 2.93 Forfeited (45,250) 5.40 Unvested, December 31, 2022 747,425 $ 4.77 Granted 450,232 7.36 Vested (448,883) 4.24 Forfeited (106,935) 7.03 Unvested, December 31, 2023 641,839 $ 6.57 The total fair value of RSUs that vested and were settled for equity was $3.00 million, $2.93 million and $2.67 million for the years ended December 31, 2023, 2022 and 2021, respectively. Stock Appreciation Rights The Company grants SARs to executives and eligible employees. 2019 Stock Appreciation Rights Grants During the year ended December 31, 2019, the Company’s Board of Directors issued SARs under the Compensation Plan with a fair value of $1.25 per SAR. These SARs are intended to provide additional long-term performance-based equity incentives for the Company’s senior management. The SARs are performance-based because they only vest upon the achievement of performance goals designed to significantly increase shareholder value. Each SAR granted entitles the holder to receive, upon a valid exercise, payment from the Company in cash or Common Shares (at the sole discretion of the Company) in an amount representing the difference between the fair market value (“ FMV ”) of the Company’s Common Shares on the date of exercise and $2.92 (the closing market price or “ Grant Price ” at the time of grant). Fair Market Value as used herein means the closing price of the Shares on the TSX or the NYSE American on the last trading day immediately prior to the date of exercise. The term of the SARs grant is five years, with SARs vesting only upon the achievement of the following performance goals: as to one-third of the SARs granted, automatically upon the 90-calendar-day volume-weighted average price (“ VWAP ”) of the Company’s Common Shares on the NYSE American equaling or exceeding $5.00 for any continuous 90-calendar-day period; as to an additional one-third of the SARs granted, automatically upon the 90-calendar-day VWAP of the Company’s Common Shares on the NYSE American equaling or exceeding $7.00 for any continuous 90-calendar-day period; and as to the final one-third of the SARs granted, automatically upon the 90-calendar-day VWAP of the Company’s Common Shares on the NYSE American equaling or exceeding $10.00 for any continuous 90-calendar-day period. Further, notwithstanding the foregoing vesting schedule, no SARs were able to be exercised by the holder for an initial period of one year from the Date of Grant; the date first exercisable being January 22, 2020. The first two tranches of these vesting performance goals were met prior to the year ended December 31, 2023. 2022 Stock Appreciation Rights Grants During the year ended December 31, 2022, the Company’s Board of Directors issued SARs under the Compensation Plan. The fair value of the SARs granted during the year ended December 31, 2022 was estimated at the date of grant using a Monte Carlo simulation. Each SAR granted entitles the holder to receive, upon a valid exercise, payment from the Company in cash or Common Shares (at the sole discretion of the Company) in an amount representing the difference between the FMV of the Company’s Common Shares on the date of exercise and $6.47 (the Grant Price at the time of grant). The term of the SARs grant is five years, with SARs vesting only upon the achievement of the following performance goals: as to one-third of the SARs granted, automatically upon the 90-calendar-day VWAP of the Company’s Common Shares on the NYSE American equaling or exceeding $12.00 for any continuous 90-calendar-day period; as to an additional one-third of the SARs granted, automatically upon the 90-calendar-day VWAP of the Company’s Common Shares on the NYSE American equaling or exceeding $14.00 for any continuous 90-calendar-day period; and as to the final one-third of the SARs granted, automatically upon the 90-calendar-day VWAP of the Company’s Common Shares on the NYSE American equaling or exceeding $16.00 for any continuous 90-calendar-day period. Further, notwithstanding the foregoing vesting schedule, no SARs may be exercised by the holder for an initial period of one year from the date of grant; the date first exercisable being January 25, 2023. As a result, the SARs granted in the first quarter of 2022 for 2021 performance are a long-term equity incentive and are 100% performance based. 2023 Stock Appreciation Rights Grants On January 26, 2023, the Company’s Board of Directors issued SARs under the Compensation Plan, which are intended to provide additional long-term equity incentives for the Company’s senior management. Each SAR granted entitles the holder to receive, upon a valid exercise, payment from the Company in cash or Common Shares (at the sole discretion of the Company) in an amount representing the difference between the FMV of the Company’s Common Shares on the date of exercise and $7.36 (being the greater of (i) the VWAP of the Company’s Common Shares on the NYSE American for the five trading days immediately prior to the date of grant, and (ii) the Grant Price). Fair Market Value as used herein means the closing price of the Common Shares on the TSX or the NYSE American on the last trading day immediately prior to the date of exercise. The term of the SARs grant is five years, with SARs vesting only upon the achievement of the following goals: as to one-third of the SARs granted, automatically upon the 90-calendar-day VWAP of the Company’s Common Shares on the NYSE American equaling or exceeding $12.00 for any continuous 90-calendar-day period; as to an additional one-third of the SARs granted, automatically upon the 90-calendar-day VWAP of the Company’s Common Shares on the NYSE American equaling or exceeding $14.00 for any continuous 90-calendar-day period; and as to the final one-third of the SARs granted, automatically upon the 90-calendar-day VWAP of the Company’s Common Shares on the NYSE American equaling or exceeding $16.00 for any continuous 90-calendar-day period. Further, notwithstanding the foregoing vesting schedule, no SARs were able to be exercised by the holder for an initial period of one year from the date of grant, the date first exercisable being January 26, 2024. The following table with the following weighted average assumptions used to determine fair values: Years Ended December 31, 2023 2022 Risk-free interest rate 3.58 % 1.68 % Expected life (in years) (1) 5.00 years 4.98 years Expected volatility (2) 55.00 % 72.81 % Expected dividend yield — % — % Weighted average grant date fair value $ 3.45 $ 3.99 (1) Monte Carlo analysis of SARs assumes employee suboptimal exercise at first vesting time for each tranche. (2) Expected volatility is measured based on the Company’s historical share price volatility over a period equivalent to the expected life of the SARs. A summary of the Company’s SARs activity is as follows: Number of Shares Weighted Average Weighted Average Remaining Contractual Life (Years) Intrinsic Value Outstanding, December 31, 2020 1,720,623 $ 2.92 Exercised (48,201) 2.92 Outstanding, December 31, 2021 1,672,422 $ 2.92 Granted 833,315 6.47 Exercised (6,730) 2.92 Forfeited (46,239) 5.95 Outstanding, December 31, 2022 2,452,768 $ 4.07 Granted 308,333 7.36 Exercised (842,107) 2.92 Forfeited (79,466) 7.30 Expired — — Outstanding, December 31, 2023 1,839,528 $ 5.01 1.86 $ 4,056 Exercisable, December 31, 2023 250,036 $ 2.92 0.06 $ 1,068 The total intrinsic value for exercised SARs was $3.55 million, $0.05 million and $0.26 million for the years ended December 31, 2023, 2022 and 2021, respectively. A summary of the Company’s unvested SARs activity is as follows: Number of Shares Weighted Average Grant Date Fair Value Unvested, December 31, 2020 1,720,623 $ 1.25 Granted — — Vested (1,147,074) 1.27 Forfeited — — Unvested, December 31, 2021 573,549 $ 1.19 Granted 833,315 3.99 Vested — — Forfeited (46,239) 4.13 Unvested, December 31, 2022 1,360,625 $ 2.81 Granted 308,333 3.45 Vested — — Forfeited (79,466) 3.58 Unvested, December 31, 2023 1,589,492 $ 2.89 Employee Stock Options The Company, under the Compensation Plan, may grant stock options to directors, executives, employees and consultants to purchase common shares of the Company. The exercise price of the stock options is set as the higher of the Company’s closing share price on the NYSE American on the last trading day before the grant date and the five-day VWAP on the NYSE American ending on the last trading day before the grant date. Stock options granted under the Compensation Plan generally vest over a period of two years or more and are generally exercisable over a period of five years from the grant date, such period not to exceed 10 years. The fair value of the stock options granted under the Compensation Plan is estimated at the date of grant, using the Black-Scholes Option Valuation Model, with the following weighted average assumptions: Years Ended December 31, 2023 2022 2021 Risk-free interest rate 3.98 % 2.43 % 0.44 % Expected life (in years) 3.2 years 3.2 years 5.0 years Expected volatility (1) 74.00 % 73.21 % 61.96 % Expected dividend yield — % — % — % Weighted average grant date fair value $ 3.80 $ 4.93 $ 2.06 (1) Expected volatility is measured based on the Company’s historical share price volatility over a period equivalent to the expected life of the stock options. A summary of the Company’s stock option activity is as follows: Range of Exercise Prices Number of Shares Weighted Average Weighted Average Remaining Contractual Life (Years) Intrinsic Value Outstanding, December 31, 2020 $1.70 - $15.61 1,609,087 $ 2.91 Granted 3.89 - 8.41 169,310 3.99 Exercised 1.70 - 7.42 (775,814) 2.95 Forfeited 1.76 - 5.91 (8,048) 3.16 Expired 1.70 - 15.61 (51,653) 8.14 Outstanding, December 31, 2021 $1.70 - $8.41 942,882 $ 2.79 Granted 5.84 - 10.03 118,318 6.52 Exercised 1.70 - 5.46 (256,315) 2.93 Forfeited 3.06 - 10.03 (20,700) 5.91 Expired 1.76 - 5.18 (16,507) 2.52 Outstanding, December 31, 2022 $1.70 - $8.41 767,678 $ 3.24 Granted 5.34 - 8.60 153,299 7.20 Exercised 1.70 - 6.47 (348,538) 2.83 Forfeited 3.89 - 7.36 (32,250) 6.74 Expired 1.76 - 6.47 (16,720) 3.75 Outstanding, December 31, 2023 $1.76 - $8.60 523,469 $ 4.48 2.31 $ 1,448 Exercisable, December 31, 2023 $1.76 - $8.41 354,286 $ 3.24 1.55 $ 1,400 The total intrinsic value of options exercised was $1.53 million, $2.23 million and $2.88 million for the years ended December 31, 2023, 2022 and 2021, respectively. A summary of the Company’s unvested stock option activity is as follows: Number of Shares Weighted Average Grant Date Fair Value Unvested, December 31, 2020 403,990 $ 0.94 Granted 169,310 2.06 Vested (351,934) 1.23 Forfeited (8,049) 1.60 Unvested, December 31, 2021 213,317 $ 1.34 Granted 118,318 4.93 Vested (170,349) 1.15 Forfeited (20,700) 4.54 Unvested, December 31, 2022 140,586 $ 4.12 Granted 153,299 3.71 Vested (92,453) 3.57 Forfeited (32,250) 3.78 Unvested, December 31, 2023 169,182 $ 4.11

INCOME TAXES

INCOME TAXES	12 Months Ended
INCOME TAXES	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES For financial reporting purposes, income before taxes includes the following components: Years Ended December 31, 2023 2022 2021 Canada $ (5,229) $ (23,964) $ (7,549) Foreign 105,261 (35,980) 8,997 Total $ 100,032 $ (59,944) $ 1,448 A reconciliation of income tax expense (benefit) and the product of accounting income before income tax, multiplied by the combined Canadian federal and provincial income tax rate (the rate applicable to the Canadian parent company) is as follows: Years Ended December 31, 2023 2022 2021 Income (loss) before income taxes $ 100,032 $ (59,944) $ 1,448 Combined federal and provincial rate 26.5 % 26.5 % 26.5 % Expected income tax (benefit) 26,508 (15,885) 384 Share-based compensation (893) 572 (89) Other non-deductible/non-taxable items 2,015 3,977 159 Unrecognized deferred tax assets (27,354) 11,336 (454) Income tax expense $ 276 $ — $ — The components of the net deferred tax assets as of December 31, 2023 and 2022 are as follows: Years Ended December 31, 2023 2022 Inventories $ 547 $ 5,984 Short-term investments 209 209 Operating loss carry forwards 93,241 108,827 Capital loss carry forwards 849 881 Deferred revenue and other 2,431 5,433 Mineral properties and deferred costs, United States 16,872 18,727 Mineral properties and deferred costs, Canada 1,726 1,815 Asset retirement obligations 2,894 3,976 Property, plant and equipment 986 1,079 Total deferred tax assets $ 119,755 $ 146,931 Less: valuation allowance (119,755) (146,931) Net deferred tax assets $ — $ — As of December 31, 2023, and 2022, the Company recorded a valuation allowance against the net deferred tax assets for the above related items in the financial statements as management did not consider it more likely than not that the Company will be able to realize the deferred tax assets in the future. The following table summarizes the changes to the valuation allowance: For the Years Ended Balance Balance December 31, Beginning of Period Additions (1) Deductions (2) End of Period 2023 $ 146,931 $ — $ (27,176) $ 119,755 2022 $ 135,503 $ 11,927 $ (499) $ 146,931 (1) There were no additions to the valuation allowance for the year ended December 31, 2023. For the year ended December 31, 2022, additions to the valuation allowance were due to additional losses incurred and increases to other tax assets such as mineral property, reclamation obligations and deferred revenue. (2) For the year ended December 31, 2023, the reductions to the valuation allowance were due to the utilization of loss carryforwards and the decrease to tax assets such as inventory, mineral property and property, plant and equipment. For the year ended December 31, 2022, the reductions to the valuation allowance are primarily due to the decreases to other tax assets such as inventories. The following table summarizes the Company's capital losses and net operating losses as of December 31, 2023 that can be applied against future taxable profit. Country Type Amount Expiry Date Canada Non-capital losses $ 51,555 2027 - 2039 Canada Allowable capital losses $ 3,204 None Canada Investment tax credits $ 1,165 2023-2027 United States Pre-2018 net operating losses $ 194,499 2026-2036 United States Post-2017 net operating losses $ 105,802 None Under Section 382 of the Internal Revenue Code of 1986, a corporation that undergoes an ownership change is subject to limitations on its use of pre-change tax attributes and carryforwards to offset future taxable income. The Company had an ownership change in 2015 and is subject to an annual limitation for the use of loss carryforwards generated prior to 2015. In addition, as a result of the Tax Cuts and Jobs Act, United States net operating loss carryforwards generated after December 31, 2017, are limited to usage at 80% of taxable income and will be permitted to be carried forward indefinitely. Utilization of the Canadian loss carry forwards will be subject to the Acquisition of Control Rules in any year as a result of previous changes in ownership. The Company files income tax returns in the U.S. federal and various state jurisdictions with varying statutes of limitations. The Company’s NOL from all years may be subject to adjustment for three or four years following the year in which utilized. We do not anticipate that any potential tax adjustments will have a significant impact on our financial position or results of operations. The Company’s policy is to include interest and penalties related to uncertain tax positions in the income tax expense line on the financial statements. As of December 31, 2023, the Company does not have any uncertain tax positions.

SUPPLEMENTAL FINANCIAL INFORMAT

SUPPLEMENTAL FINANCIAL INFORMATION	12 Months Ended
SUPPLEMENTAL FINANCIAL INFORMATION	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Financial Information	SUPPLEMENTAL FINANCIAL INFORMATION The Company’s sales to major customers (purchases in excess of 10% of total sales) are as follows: Years Ended December 31, 2023 2022 2021 Customer 1 $ 18,470 $ — $ — Customer 2 10,472 — — Customer 3 4,335 — — Customer 4 2,848 2,592 1,385 Customer 5 866 8,778 — Customer 6 — 445 1,571 The Company’s revenues by country of customer are as follows: Years Ended December 31, 2023 2022 2021 U.S. $ 34,514 $ 9,473 $ 1,721 Estonia 2,848 2,592 1,385 Other 566 450 78 Total revenues $ 37,928 $ 12,515 $ 3,184 The Company’s outstanding trade receivables from its major customers are as follows: December 31, 2023 2022 Customer 1 $ 291 $ — The Company’s outstanding trade receivables by country of customer are as follows: December 31, 2023 2022 U.S. $ 115 $ 92 Estonia 291 — Total trade receivables $ 406 $ 92 The components of other income (loss) are as follows: Years Ended December 31, 2023 2022 2021 Unrealized gain (loss) on investments $ 15,472 $ (16,808) $ 6,311 Realized loss on investments (10,491) — — Unrealized gain (loss) on marketable securities (530) (456) 795 Realized gain on maturities of marketable securities 1,141 — — Realized gain on convertible note 1,430 — — Change in value of warrant liabilities — — (8,078) Foreign exchange gain (loss) 423 2,058 (128) Department of Energy awards — — 1,900 Interest income, net and other 5,697 (166) 340 Other income (loss) $ 13,142 $ (15,372) $ 1,140 The components of accounts payable and accrued liabilities are as follows: December 31, 2023 2022 Accounts payable $ 1,006 $ 1,850 Accrued operating expenses 4,391 1,783 Accrued payroll liabilities 4,162 2,929 Accrued capital expenditures 205 22 Accrued taxes 393 240 Other accrued liabilities 4 105 Total accounts payable and accrued liabilities $ 10,161 $ 6,929

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
COMMITMENTS AND CONTINGENCIES	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES General Legal Matters Other than routine litigation incidental to our business, or as described below, the Company is not currently a party to any material pending legal proceedings that management believes would be likely to have a material adverse effect on our financial position, results of operations or cash flows. White Mesa Mill In 2011, the Ute Mountain Ute Tribe filed an administrative appeal of the State of Utah Division of Air Quality’s (“ UDAQ ”) decision to approve a Modification to the Air Quality Approval Order at the Mill. Then, in 2013, the Ute Mountain Ute Tribe filed a Petition to Intervene and Request for Agency Action challenging the Corrective Action Plan approved by the State of Utah Department of Environmental Quality (“ UDEQ ”) relating to nitrate contamination in the shallow aquifer at the Mill. In August 2014, the Ute Mountain Ute Tribe filed an administrative appeal to the State of Utah Division of Radiation Control’s (“ DRC ”) Radioactive Materials License Amendment 7 approval regarding alternate feed material from Dawn Mining. The challenges remain open at this time and may involve the appointment of an administrative law judge (“ ALJ ”) to hear the matters. The Company does not consider these actions to have any merit. If the petitions are successful, the likely outcome would be a requirement to modify or replace the existing Air Quality Approval Order, Corrective Action Plan or license amendment, as applicable. At this time, the Company does not believe any such modifications or replacements would materially affect its financial position, results of operations or cash flows. However, the scope and costs of remediation under a revised or replaced Air Quality Approval Order, Corrective Action Plan and/or license amendment have not yet been determined and could be significant. The UDEQ renewed in January 2018, then reissued with minor corrections in February 2018, the Mill’s radioactive materials license (the “ Mill License ”) for another ten years and the Groundwater Discharge Permit (the “ GWDP ”) for another five years, after which further applications for renewal of the Mill License and GWDP are required to be submitted. During the review period for each application for renewal, the Mill can continue to operate under its existing Mill License and GWDP until such time as the renewed Mill License or GWDP is issued. Most recently, on July 15, 2022, the routine GWDP renewal application was submitted to UDEQ, which remains under consideration at this time. In 2018, the Grand Canyon Trust, Ute Mountain Ute Tribe and Uranium Watch (collectively, the “ Mill Plaintiffs ”) served Petitions for Review challenging UDEQ’s renewal of the Mill License and GWDP and Requests for Appointment of an ALJ, which they later agreed to suspend pursuant to a Stipulation and Agreement with UDEQ, effective June 4, 2018. The Company and the Mill Plaintiffs held multiple discussions over the course of 2018 and 2019 in an effort to settle the dispute outside of any judicial proceeding. In February 2019, the Mill Plaintiffs submitted to the Company their proposal for reaching a settlement agreement. The proposal remains under consideration by the Company. The Company does not consider these challenges to have any merit and, if a settlement cannot be reached, the Company intends to participate with UDEQ in defending against the challenges. If the challenges are successful, the likely outcome would be a requirement to modify the renewed Mill License and/or GWDP. At this time, the Company does not believe that any such modification would materially affect its financial position, results of operations or cash flows. On August 26, 2021, the Ute Mountain Ute Tribe filed a Petition to Intervene and Petition for Review challenging the UDEQ’s approval of Amendment No. 10 to the Mill License, which expanded the list of Alternate Feed Materials that the Mill is authorized to accept and process for its source material content. Then, on November 18, 2021, the Tribe filed its Request for Appointment of an ALJ, followed shortly thereafter by a stay on the request in accordance with a Stipulation and Agreement between the Tribe, UDEQ and Company. Thereafter, discussions between the Company and the Tribe commenced in an effort to resolve the dispute and other outstanding matters without formal adjudication. However, the Company does not consider this action to have any merit. If resolution is not achieved, the stay is lifted and the petition is successful before an ALJ, the likely outcome would be a requirement to modify or revoke the Mill License amendment. At this time, the Company does not believe any such modification or revocation would materially affect its financial position, results of operations or cash flows. Mineral Property Commitments The Company enters into commitments with federal and state agencies and private individuals to lease mineral rights. These leases are renewable annually, and annual renewal costs are expected to total $1.60 million for the year ended December 31, 2024. Surety Bonds The Company has indemnified third-party companies to provide surety bonds as collateral for the Company’s AROs. The Company is obligated to replace this collateral in the event of a default and is obligated to repay any reclamation or closure costs due. As of December 31, 2023, the Company has $17.58 million posted as collateral against an undiscounted ARO of $33.38 million. As of December 31, 2022, the Company has $21.04 million posted as collateral against an undiscounted ARO of $42.91 million. Commitments The Company is contractually obligated under a Sales and Agency Agreement appointing an exclusive sales and marketing agent for all vanadium pentoxide produced by the Company.

FAIR VALUE ACCOUNTING

FAIR VALUE ACCOUNTING	12 Months Ended
FAIR VALUE ACCOUNTING	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value Accounting	INVESTMENTS As of December 31, 2022, the Company owned a 17.4% interest in Consolidated Uranium Inc. (“ CUR ”) and a 13.5% interest in Virginia Energy Resources, Inc. (“ Virginia Energy ”). The Company had significant influence, but not control, over these investments. As such, Virginia Energy and CUR were accounted for as equity method investments with the fair value option elected and classified as Investments on the Consolidated Balance Sheet. Changes in value of these investments are included in Other income (loss) in the Consolidated Statement of Operations and Comprehensive Income (Loss). For the years ended December 31, 2023, 2022 and 2021, the Company had a net unrealized gain of $4.98 million, an unrealized loss of $16.81 million and a unrealized gain of $6.31 million, respectively. On January 24, 2023, CUR acquired 100% of the issued and outstanding common shares of Virginia Energy in for 0.26 common shares of CUR for every one common share of Virginia Energy. As a result, the Company’s 9,439,857 common shares of Virginia Energy were converted into 2,454,362 million common shares of CUR (the “ Conversion ”). Following the Conversion, the Company owned 16,189,548 common shares of CUR, which represented an ownership interest of 16.7% in CUR as of closing. On December 5, 2023, IsoEnergy Ltd. (“ IsoEnergy ”) acquired all of the issued and outstanding common shares of CUR (the “ CUR Shares ”). Pursuant to the arrangement, CUR’s shareholders received 0.500 common shares of IsoEnergy for every CUR Share. When converted, the Company's CUR Shares results in an approximate ownership interest in IsoEnergy of 5.0%. On October 19, 2023, IsoEnergy completed its marketed private placement offering of 8,134,500 subscription receipts of IsoEnergy (the “ Subscription Receipts ”) at a price of Cdn$4.50 per Subscription Receipt; in order to retain its post-arrangement ownership interest in IsoEnergy, the Company purchased 406,650 Subscription Receipts for Cdn$1.83 million. Each outstanding Subscription Receipt has been converted into one common share of IsoEnergy. Following completion of this arrangement, the Company owned 8,501,424 shares of IsoEnergy for an approximate ownership interest of 5.0% as of December 5, 2023. Upon completion of this arrangement, the Company does not have significant influence over IsoEnergy as a result of no representation on the Board of Directors of IsoEnergy and its reduced ownership interest. Therefore, the investment is no longer accounted for as an equity method investment. The Company's judgment regarding the level of influence over its equity method investments includes considering key factors such as the Company's ownership interest, representation on the Board of Directors and participation in the policy-making decisions of equity method investees. As such, the Company's shares in IsoEnergy are accounted for as marketable securities with the fair value option elected on its Consolidated Balance Sheet and changes in value are included in Other income (loss) in the Consolidated Statement of Operations and Comprehensive Income (Loss). CUR As of December 5, 2023 and December 31, 2022, the fair value of the Company’s investment in CUR was $23.63 million and $16.50 million, respectively. Pursuant to Rule 3-09 of Regulation S-X (“ Rule 3-09 ”), the Company is required to file separate audited financial statements of CUR if either the investment test or income test as set forth in that rule equals or exceeds the 20% level individually. As of December 31, 2022, the income test was met at the 20% significance level for CUR. The Company will amend this Annual Report to include as an exhibit the separate audited financial statements for the year ended December 31, 2022 and unaudited financial statements for the period ending December 5, 2023. In accordance with Rule 4-08(g) of Regulation S-X (“ Rule 4-08(g) ”), the summarized financial information for CUR is set forth below on a one-quarter lag, which precedes the date of the Company’s investment for the year ended December 31, 2021. CUR prepares its financial statements in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board (“ IFRS ”) and uses Cdn$ as its reporting currency. As such, the Company has made certain adjustments to CUR’s summarized financial information to address differences between IFRS and GAAP that materially impact the summarized financial information and to convert such information to US$. September 30, 2023 2022 Current assets $ 7,522 $ 16,586 Non-current assets $ 31,717 $ 17,437 Current liabilities $ 3,589 $ 2,285 Non-current liabilities $ 319 $ — Twelve Months Ended September 30, 2023 2022 2021 Loss from continuing operations $ (8,817) $ (23,103) $ (4,253) Net loss and net loss attributable to the entity $ (8,902) $ (17,890) $ (4,570) Virginia Energy The fair value of the Company's investment in Virginia Energy was $3.39 million and $2.83 million as of January 24, 2023 and December 31, 2022, respectively. Pursuant to Rule 3-09, the Company is required to file separate audited financial statements of Virginia Energy if either the investment test or income test as set forth in that rule equals or exceeds the 20% level individually. As of December 31, 2021, the income test was met at the 20% significance level for Virginia Energy. Exhibit 99.1 to this Annual Report includes separate audited financial statements for the year ended December 31, 2021 and unaudited financial statements for the twenty-three day period ended January 23, 2023 and the year ended December 31, 2022 of Virginia Energy. In accordance with Rule 4-08(g), summarized financial information for Virginia Energy is set forth below on a one-quarter lag. Virginia Energy prepares its financial statements in accordance with IFRS. The Company determined that no adjustments to Virginia Energy’s summarized financial information were necessary to address differences between IFRS and GAAP that materially impact the summarized financial information. January 23, 2023 September 30, 2022 Current assets $ 133 $ 163 Non-current assets $ 4,253 $ 3,753 Current liabilities $ 2 $ 223 Non-current liabilities $ 2 $ 2 For the Period October 1, 2022 to January 23, 2023 Twelve Months Ended September 30, 2022 2021 Loss from continuing operations, net loss and net loss attributable to the entity $ (226) $ (371) $ (275) Assets and Liabilities Measured at Fair Value on a Recurring Basis Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Fair value accounting utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 – Quoted prices in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; and Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity). The Company’s financial instruments include cash, restricted cash, accounts receivable, accounts payable and current accrued liabilities. These instruments are carried at cost, which approximates fair value due to the short-term maturities of the instruments. Allowances for doubtful accounts are recorded against the accounts receivable balance to estimate net realizable value. As of December 31, 2023 and 2022, the fair values of cash, restricted cash, short-term deposits, receivables, accounts payable and accrued liabilities approximate their carrying values because of the short-term nature of these instruments. The Company’s investments in marketable equity securities are publicly traded stocks measured at fair value and classified within Level 1 and Level 2 in the fair value hierarchy. Level 1 marketable equity securities use quoted prices for identical assets in active markets, while Level 2 marketable equity securities utilize inputs based upon quoted prices for similar instruments in active markets. The Company’s investments in marketable debt securities are valued using quoted prices of a pricing service and as such, are classified within Level 2 of the fair value hierarchy. The Company’s investments include certain investments accounted for at fair value consisting of Common Shares are valued using quoted market prices in active markets and as such are classified within Level 1 of the fair value hierarchy. The Company’s investments include certain investments accounted for at fair value consisting of warrants are valued using the Black-Scholes option model based on observable inputs and as such are classified within Level 2 of the hierarchy. The Convertible Note received as part of the Alta Mesa Transaction was valued as of February 14, 2023, upon closing, using a binomial lattice model. The fair value calculation uses significant unobservable inputs, including: (i) volatility 60%, and (ii) yield of 9.5%. Increases or decreases in the volatility and/or the selected yield can result in an increase or decrease in the fair value of the Convertible Note. Between February 14, 2023 and November 3, 2023, enCore early redeemed $40.00 million of the principal value of the Convertible Note. On November 9, 2023, the Company sold the remaining unpaid balance of $20 million owed under the secured Convertible Note for total consideration of $21.00 million plus $1.50 million in unpaid accrued interest, less a sales commission of $100,000 paid to a third-party broker. As a result of enCore’s earlier pay-down and the $22.40 million received in connection with the sale of the Convertible Note, the Company has now received payment in full for the Alta Mesa Transaction, and no further consideration is owed in connection therewith. The following tables set forth the fair value of the Company’s assets and liabilities measured at fair value on a recurring basis (at least annually) by level within the fair value hierarchy. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Level 1 Level 2 Level 3 Total December 31, 2023 Cash equivalents (1) $ — $ 40,512 $ — $ 40,512 Marketable equity securities 25,554 24 — 25,578 Marketable debt securities — 107,466 — 107,466 $ 25,554 $ 148,002 $ — $ 173,556 December 31, 2022 Cash equivalents (1) $ — $ 30,336 $ — $ 30,336 Investments accounted for at fair value 19,263 66 — 19,329 Marketable equity securities 1,033 34 — 1,067 Marketable debt securities — 11,125 — 11,125 $ 20,296 $ 41,561 $ — $ 61,857 (1) Cash and cash equivalents are comprised of U.S. Treasury Bills, Government Agency Bonds, U.S. Non-Redeemable Term Deposits and mutual funds purchased within three months of their maturity date. Changes in Level 3 Fair Value Measurements The following table is a reconciliation of the beginning and ending balance recorded for the Convertible Note classified as Level 3 in the fair value hierarchy: Beginning balance, February 14, 2023 $ 59,457 Principal redeemed and sale (60,887) Realized gain included in other income (loss) 1,430 Ending balance, December 31, 2023 $ —

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	12 Months Ended
RELATED PARTY TRANSACTIONS	Dec. 31, 2023
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS Robert W. Kirkwood, a member of the Company’s Board of Directors, is a principal of the Kirkwood Companies, including Kirkwood Oil and Gas LLC, Wesco Operating, Inc., and United Nuclear LLC (“ United Nuclear ”). United Nuclear owns a 19% interest in the Company’s Arkose Mining Venture while the Company owns the remaining 81%. The Company acts as manager of the Arkose Mining Venture and has management and control over operations carried out by the Arkose Mining Venture. The Arkose Mining Venture is a contractual joint venture governed by a venture agreement dated as of January 15, 2008 and entered into by United Nuclear and Uranerz Energy Corporation, a wholly owned, indirectly held subsidiary of the Company (“ Uranerz ”) and United Nuclear (the “ Venture Agreement ”). United Nuclear contributed $0.08 million, $0.13 million and $0.31 million to the expenses of the Arkose Joint Venture based on the approved budget for the years ended December 31, 2023, 2022 and 2021, respectively. On October 27, 2021, after closing on the sale of certain conventional uranium assets to CUR, the Company began providing services to CUR under a mine operating agreement. See Note 7 – Property, Plant and Equipment and Mineral Properties for more information. Pursuant to that agreement, the Company earned $0.57 million and $0.45 million during the years ended December 31, 2023 and 2022, respectively. As of December 31, 2023 and 2022, the Company was due $0.05 million and $0.08 million, respectively, from CUR for revenues earned under the mine operating agreements. Additionally, the Company accrued $1.53 million and $1.54 million as of December 31, 2023 and 2022, respectively, in Other long-term receivables related to deferred cash payments for production thresholds pursuant to the terms of the asset purchase agreement with CUR.

REVENUE RECOGNITION AND CONTRAC

REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS	12 Months Ended
REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS	REVENUE All revenue recognized is a result of contracts with customers by way of uranium, vanadium and RE Carbonate sales contracts, Alternate Feed Material processing contracts and/or byproduct disposal agreements with other ISR facilities. Uranium Concentrates The Company's sales of uranium concentrates are derived from contracts with major U.S. utilities. Revenue is recognized when delivery is evidenced by book transfer at the applicable uranium storage facility. The sales contracts specify the quantity to be delivered, the price, payment terms and the year of the delivery. The Company's agreements with major U.S. utilities have terms greater than one year. The Company is not required to disclose the transaction price allocated to remaining performance obligations because the variable consideration is allocated entirely to a wholly unsatisfied performance obligation. Under these contracts, each delivery product transferred to the customer represents a separate performance obligation; therefore, future quantities are wholly unsatisfied and disclosure of the transaction price allocated to remaining performance obligations is not required. The Company will also sell uranium concentrate to the U.S. Uranium Reserve or other third parties and such contracts are short-term in nature with a contract term of one year or less. Accordingly, the Company is exempt from disclosure of the transaction price allocated to remaining performance obligations if the performance obligation is part of a contract that has an original expected duration of one year or less. Under the Company's uranium contracts, it invoices customers after the performance obligations have been satisfied, at which point payment is unconditional. Accordingly, the Company’s uranium contracts do not give rise to contract assets or liabilities. Vanadium Concentrates The Company's sales of vanadium concentrates are recognized when delivery is evidenced by book transfer at the applicable vanadium storage facility. Under the Company's vanadium contracts, it invoices customers after the performance obligations have been satisfied, at which point payment is unconditional. Accordingly, the Company’s vanadium contracts do not give rise to contract assets or liabilities. RE Carbonate The Company's sales of RE Carbonate revenue is recognized when delivery of the mixed RE Carbonate material has arrived at the applicable separation facility. Additionally, the Company will recognize revenue when the customer further processes the product from the RE Carbonate that the Company delivered and it is sold to a third party. Additionally, under this contract, each delivered product transferred to the customer represents a separate performance obligation; therefore, future volumes are wholly unsatisfied and disclosure of the transaction price allocated to remaining performance obligations is not required. Accordingly, the Company’s contracts do not give rise to contract assets or liabilities. Alternate Feed Materials Revenue from the delivery of mineralized material received from the clean-up of a third-party uranium mine or for other Alternate Feed Materials is typically recognized upon delivery to the Mill. Revenue from toll milling services is recognized as material is processed in accordance with the specifics of the applicable toll milling agreement. Revenue and unbilled accounts receivable are recorded as related costs are incurred using billing formulas included in the applicable toll milling agreement. As of December 31, 2023 and 2022, the Company's receivables from its contracts with customers was $0.41 million and $0.09 million, respectively.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Issued Capital Stock The Company issued a total of 0.62 million Common Shares under the ATM for net proceeds of $4.79 million, after share issuance costs, through various transactions from December 31, 2023 to February 23, 2024. Issuance of RSUs and Stock Options On January 25, 2024, the Company granted $2.78 million of RSUs at a grant price of $7.48 per share, $0.68 million of non-incentive stock options with an exercise price of $7.48 per share, and $0.97 million of non-incentive stock options at a 10% premium with an exercise price of $8.23 per share to its employees and directors. The stock options carry a five-year life and vest as follows: 50% on January 25, 2025; and 50% on January 25, 2026. The RSUs vest as follows: 50% on January 27, 2025; 25% on January 27, 2026; and 25% on January 27, 2027. Additionally, the Company granted $0.31 million non-incentive stock options with an exercise price of $7.48 per share to certain consultants (“ Consultant Options ”). The Consultant Options carry a three-year life and vest as follows: 50% on January 25, 2025; and 50% on January 25, 2026.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net income (loss) for the period	$ 99,756	$ (59,944)	$ 1,448

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“ U.S. GAAP ”) and are presented in thousands of U.S. dollars (“ USD ”), except for share and per share amounts. Certain footnote disclosures, where indicated, have share prices that are presented in Canadian dollars (“ Cdn$ ”).
Use of Estimates	Use of Estimates The preparation of the Company’s consolidated financial statements in accordance with U.S. GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of expenses during the reporting period. The Company must make these estimates and assumptions because certain information used is dependent on future events, cannot be calculated with a high degree of precision from data available or simply cannot be readily calculated based on generally accepted methodologies. The more significant areas requiring the use of management estimates and assumptions relate to expectations of the future prices of uranium and REE as well as estimates of recoverable mineral resources that are the basis for future cash flow estimates utilized in assessing fair value for business combinations and impairment calculations; the determination of whether an acquisition represents a business combination or an asset acquisition; the use of management estimates and assumptions related to environmental, reclamation and closure obligations; marketable securities and derivative instruments; and share-based compensation expense. Actual results may differ significantly from these estimates.
Principles of Consolidation	Principles of Consolidation These consolidated financial statements include the accounts of the Company together with subsidiaries controlled by the Company. Intercompany transactions, balances and unrealized gains and losses on transactions between the Company and its subsidiaries are eliminated. Management has evaluated how the Company is organized and managed and has identified that the Company is organized and managed as one segment. The functional currency of the Company’s operations is the USD.
Extracting and Recovery Activities While in the Development Stage	Extracting and Recovery Activities While in the Development Stage The Company extracts or recovers mineralized uranium from mining activities, mill tailings, pond solutions and Alternate Feed Materials, resulting in saleable uranium concentrates from its Mill and, when operating, its Nichols Ranch Project. While the Company has established the existence of multiple Mineral Resources and extracts and processes saleable uranium from these operations, the Company has only established proven or probable Mineral Reserves, as defined under SEC S-K 1300, at its Sheep Mountain and Pinyon Plain projects. Costs incurred before the establishment of proven and probable reserves are expensed and classified as development expense. As a result, the Company’s consolidated financial statements may not be directly comparable to the financial statements of mining companies in the development stage having multiple Mineral Reserves or in the production stage.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company reviews and evaluates its long-lived assets for impairment when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Mineral properties are monitored for impairment based on factors such as mineral prices, government regulation and taxation, the Company's continued right to explore the area, exploration reports, assays, technical reports, drill results and its continued plans to fund exploration programs on the property. At each reporting date, the Company conducts a review of potential triggering events for all its mineral properties. When events or changes in circumstances indicate that the related carrying amounts may not be recoverable, the Company carries out a review and evaluation of its long-lived assets in accordance with its accounting policy. Impairment losses are recognized in profit or loss. Recoverability is measured by comparing the undiscounted future net cash flows to the net book value. When the net book value exceeds future net undiscounted cash flows, the fair value is compared to the net book value and an impairment loss may be measured and recorded based on the excess of the net book value over fair value. Fair value for operating mines is determined using a combined approach, which uses a discounted cash flow model for the existing operations and non-operating properties with available cash flow models and a market approach for the fair value assessment of non-operating and exploration properties where no cash flow model is available. Future cash flows are estimated based on quantities of recoverable mineralized material, expected uranium or REE prices (considering current and historical prices, trends and estimates), production levels, operating costs, capital requirements and reclamation costs, all based on life-of-mine plans. In estimating future cash flows, assets are grouped at the lowest level, for which there are identifiable cash flows that are largely independent of future cash flows from other asset groups. The Company's estimates of future cash flows are based on numerous assumptions, and it is possible that actual future cash flows will be significantly different than the estimates, as actual future quantities of recoverable minerals, uranium prices, production levels, costs and capital are each subject to significant risks and uncertainties. No impairment of property, plant and equipment and mineral properties were recorded during the years ended December 31, 2023, 2022 and 2021.
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents consist of all cash balances and highly liquid investments with an original maturity of three months or less. Because of the short maturity of these investments, the carrying amounts approximate their fair value. Restricted cash is excluded from cash and cash equivalents and is included in other current or long-term assets, depending on the nature of the restriction. See Note 8 – Asset Retirement Obligations and Restricted Cash for more information.
Marketable Securities	Marketable Securities Marketable debt securities consist of excess cash invested in U.S. government notes, U.S. government agencies and tradeable certificates of deposits. The Company classifies and accounts for its marketable debt securities under the fair value option. After consideration of the Company's risk versus reward objectives, as well as its liquidity requirements, the Company may sell these debt securities prior to their stated maturities. As management views these securities as available to support current operations, the Company classifies highly liquid securities with maturities beyond 12 months as current assets under the caption Marketable securities on the Consolidated Balance Sheet. The Company received a secured convertible note (the “ Convertible Note ”) as partial consideration for the Alta Mesa Transaction (defined in Note 7 – Property, Plant and Equipment and Mineral Properties). The Company elected the fair value option for the Convertible Note, as it had the option of converting the principal due into fully paid and non-assessable common shares of enCore Energy Corp. (“ enCore ”). During the year ended December 31, 2023, the Convertible Note was partially redeemed and the remaining principal balance was sold. Subsequent to initial recognition, marketable debt securities are measured at fair value and changes therein are recognized as a component of Other income (loss) in the Consolidated Statements of Operations and Comprehensive Income (Loss). Marketable equity securities consist of investments in publicly traded equity securities. The Company classifies and accounts for its marketable equity securities as available-for-sale. Subsequent to initial recognition, marketable equity securities are measured at fair value and changes therein are recognized as a component of Other income (loss) in the Consolidated Statements of Operations and Comprehensive Income (Loss).
Accounts Receivable	Accounts Receivable Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The Company evaluates its estimate of expected credit losses based on historical experience and current and forecasted future economic conditions for each portfolio of customers. As of December 31, 2023 and 2022, the Company did not have an allowance for expected credit losses for trade accounts receivable.
Investments at Fair Value	Investments Investments Accounted for at Fair Value The Company accounts for equity method investments over which the Company exerts significant influence, but not control, over the financial and operating policies through the fair value option of FASB ASC Topic 825, Financial Instruments . The Company elected the fair value option based on practical expedience, variances in reporting timelines and cost-benefit considerations. The cost of such investments is measured at the fair value of the assets given up, shares issued and liabilities assumed at the date of acquisition plus costs directly attributable to the acquisition. Subsequent to initial recognition, they are measured at fair value. The fair value of the investee’s common shares is measured based on its closing market price. The Company uses the Black-Scholes option pricing model to estimate the fair value of its investment in warrants with the following assumptions: (i) the investee’s closing market price on the valuation date, (ii) the risk-free interest rate computed based on the U.S. Treasury yield, (iii) an expected term equal to the remaining contractual term, (iv) a dividend yield of zero, and (v) the expected stock price volatility calculated based on the historical volatility of the common shares of the investee. Changes in the fair value of these investments are recognized in Other income (loss) in the Company’s Consolidated Statements of Operations and Comprehensive Income (Loss). See Note 6 – Investments for more information. Investments Without a Readily Determinable Fair Value The Company measures equity investments without readily determinable fair values at cost, less any impairment, adjusted for observable price changes from orderly transactions for identical or similar investments of the same issuer. See Note 6 – Investments for more information.
Inventories	Inventories Inventories are valued at the lower of average cost or net realizable value. Net realizable value represents the estimated future sales price of the product based on current and long-term prices, less the estimated costs to bring the product to sale. Inventories are comprised of stockpiles or raw materials, work-in-process inventories and finished goods. Expenditures related to the extraction and recovery of uranium concentrates and depreciation of the acquisition cost of the Extracting and Recovery Operations are inventoried as stockpiles and in-process and concentrate inventories.
Property, Plant and Equipment	Property, Plant and Equipment Recognition and measurement Property, plant and equipment is measured at cost less accumulated depreciation and any accumulated impairment losses. Costs include expenditures that are directly attributable to the acquisition of the asset. Subsequent costs are included in the asset’s carrying amount or recognized as a separate asset, when it is replaced, and the cost of the replacement asset is expensed. Depreciation Depreciation of property, plant and equipment is calculated using the straight-line method over the estimated useful lives less the salvage value of assets. The estimated useful lives of the Company's assets range from 3 to 15 years depending upon the asset type. Uncertainties that may impact these estimates of useful lives include, among others, changes in laws and regulations or changes in attitudes or interpretations of such laws and regulations relating to environmental matters, restoration and abandonment requirements, economic conditions and supply and demand for the Company’s services in the areas in which it operates. When assets are placed into service, management makes estimates with respect to useful lives and salvage values that it believes are reasonable. When assets are retired or sold, the resulting gains or losses are reflected in current earnings as a component of other income or expense. Salvage values, method of depreciation and useful lives of the assets are reviewed at least annually and any change in estimate is applied prospectively.
Non-operating Assets	Non-Operating Assets Non-operating assets consist of mineral properties and rights, along with data and analyses related to the properties, which are in various stages of evaluation and permitting. Costs to acquire the non-operating assets are capitalized at cost or fair value if such assets were acquired as part of a business combination. Mining activities for non-operating assets involve the search for minerals, the determination of technical feasibility and the assessment of commercial viability of an identified resource. Expenditures incurred in relation to such mining activities include costs which are directly attributable to researching and analyzing existing exploration data; conducting geological studies, exploratory drilling and sampling; examining and testing extraction and treatment methods; and completing pre-feasibility and feasibility studies. Such expenditures are expensed as incurred. Mineral properties, that are not held for production, and any related surface access to the minerals generally require periodic payments and/or certain expenditures related to the property in order for the Company to retain its interest in the mineral property (collectively, “ Holding Costs ”). The Company expenses all Holding Costs in the period they are incurred.
Stand-by Properties	Stand-by Properties Stand-by properties are mineral properties that have extracted mineral resources in the past but are currently non-operating or properties, which could extract mineral resources in the future. Expenditures related to these properties are primarily related to maintaining the assets and permits in a condition that will allow re-start of the operations or development given appropriate commodity prices. All costs related to stand-by assets are expensed as incurred. The Mill operates on a campaign basis. When the Mill is not recovering material, all related costs are expensed as incurred.
Leases	Leases The Company accounts for leases under Financial Accounting Standards Board (the “ FASB ”) Accounting Standard Codification (“ ASC ”) Topic 842, Leases
Asset Retirement Obligations	Asset Retirement Obligations The Company’s asset retirement obligations (“ ARO ”) relate to expected mine, wellfield, plant and mill reclamation and closure activities, as well as costs associated with reclamation of exploration drilling. The Company’s activities are subject to numerous governmental laws and regulations. Estimates of future reclamation liabilities for ARO are recognized in the period when such liabilities are incurred. These estimates are updated on a periodic basis and are subject to changing laws, regulatory requirements, technology and other factors, which will be recognized when appropriate. Liabilities related to site restoration include long-term treatment and monitoring costs and incorporate total expected costs net of recoveries. Expenditures incurred to dismantle facilities, restore and monitor closed resource properties are charged against the related ARO. The present value of AROs is measured by discounting the expected cash flows using a discount factor that reflects the credit-adjusted risk-free rate of interest, while taking into account an inflation rate. The ARO liability is accreted to full value over time through periodic accretion charges recorded to operations as accretion expense. The Company adjusts the estimate of the ARO for changes in the amount or timing of underlying future cash outflows. The impact of these adjustments to the ARO amounts are expensed as incurred.
Warrant Liabilities	Warrant Liabilities The Company issued several tranches of warrants for various equity transactions in 2016 all of which were either settled or expired in 2021 and thus, no longer outstanding as of December 31, 2022 and 2023. The Company accounted for its warrants issued in accordance with FASB ASC Topic 815, Derivative and Hedging (“ ASC 815 ”), which required instruments within its scope to be recorded on the balance sheet as either an asset or liability measured at its fair value, with changes in fair value recognized in earnings. In accordance with ASC 815, the Company classified the warrants as liabilities. The warrants were subject to re-measurement at each balance sheet date, with any change in fair value recognized as a component of Other income (loss) in the Consolidated Statements of Operations and Comprehensive Income (Loss). The Company estimated the fair value of these warrants using market prices, if available, or the Black-Scholes option pricing model. The Black-Scholes option pricing model is based on the estimated market value of the underlying common stock at the measurement date, the remaining contractual term of the warrant, risk-free interest rates and expected dividends on, and expected volatility of the price of the underlying common stock.
Revenue	Revenue Sale of goods Revenue from the sale of mineral concentrates is recognized when control transfers to customers at amounts to which the Company expects to be entitled. For uranium concentrates, revenue is typically recognized when delivery is evidenced by book transfer at the applicable uranium storage facility. For vanadium concentrates, revenue is typically recognized when delivery is evidenced by book transfer at the applicable vanadium storage facility. For RE Carbonate, revenue is typically recognized when delivery of the mixed RE Carbonate material has arrived at the applicable separations facility. Rendering of services Revenue from the delivery of mineralized material received from the clean-up of a third-party uranium mine or for other Alternate Feed Materials is typically recognized upon delivery to the White Mesa Mill. Revenue from toll milling services is recognized as material is processed in accordance with the specifics of the applicable toll milling agreement. Revenue and unbilled accounts receivable are recorded as related costs are incurred using billing formulas included in the applicable toll milling agreement. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from revenue.
Share-Based Compensation	Share-Based Compensation The Company measures share-based compensation awards exchanged for director, employee and contractor services at fair value on the date of the grant and expenses the awards in the Consolidated Statements of Operations and Comprehensive Income (Loss) over the requisite employee service period. The fair value of restricted stock units (“ RSUs ”) is based on the Energy Fuels’ closing stock price on the date of grant. The fair value of stock appreciation rights (“ SARs ”) with market conditions is based on a Monte Carlo simulation performed by a third-party valuation firm. The fair value of stock options is determined using the Black-Scholes valuation model. Share-based compensation expense related to awards with only service conditions having a graded vesting schedule is recorded on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in substance, multiple awards, while expense for all other awards are recognized on a straight-line basis. The Company’s estimates may be impacted by certain variables including, but not limited to, stock price volatility, employee stock option exercise behaviors, additional stock option grants, the Company's performance and related tax impacts.
Foreign Currency	Foreign Currency Transactions in foreign currencies are translated to the respective functional currency of the Company’s subsidiaries and joint ventures at exchange rates at the dates of the transactions. Monetary assets and liabilities denominated in foreign currencies are translated to the functional currency at the exchange rate as of the reporting date. Non-monetary assets and liabilities that are measured at fair value in a foreign currency are translated to the functional currency at the exchange rate when the fair value was determined. Foreign currency differences are generally recognized in profit or loss. Non-monetary items that are measured based on historical cost in a foreign currency are not translated. The assets and liabilities of entities whose functional currency is not the U.S. dollar are translated into the U.S. dollar at the exchange rate as of the reporting date. The income and expenses of such entities are translated into the U.S. dollar using average exchange rates for the reporting period. Exchange differences on foreign currency translations are recorded in Other comprehensive income (loss). The Company’s functional currency is the U.S. dollar.
Income Taxes	Income Taxes The Company uses the asset and liability method of accounting for income taxes. Under this method, deferred income tax assets and liabilities are recorded based on differences between the financial statement carrying values of existing assets and liabilities and their respective income tax bases (temporary differences), and losses carried forward. Deferred income tax assets and liabilities are measured using the enacted tax rates which will be in effect when the temporary differences are likely to reverse. The effect on deferred income tax assets and liabilities of a change in tax rates is included in operations in the period in which the change is enacted. The Company records a valuation allowance to reduce deferred income tax assets to the amount that is believed more likely than not to be realized. When the Company concludes that all or part of the deferred income tax assets are not realizable in the future, the Company makes an adjustment to the valuation allowance that is charged to income tax expense in the period such determination is made.
Net Income (Loss) per Share	Net Income (Loss) per Share The Company presents basic income (loss) per share data for its common shares, calculated by dividing the income (loss) attributable to common shareholders of the Company by the weighted average number of common shares outstanding during the period. Diluted income (loss) per share is determined by adjusting the income (loss) attributable to common shareholders and the weighted average number of common shares outstanding for the effects of all potential dilutive instruments based on the number of common shares that would be issuable if the end of the period was also the end of the performance period required for the vesting of the awards. Potentially dilutive instruments include stock options, restricted stock units, stock appreciation rights and warrants, which are included in the diluted income (loss) per share calculation using the treasury stock method.
Recently Adopted & Issued Accounting Pronouncements	Recently Issued Accounting Standards Segment Reporting In November 2023, the FASB issued Accounting Standard Update (“ ASU ”) 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” This ASU requires annual and interim disclosures about significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss as well as the amount and composition of other segment items. The Company will adopt this standard prospectively on January 1, 2024 and does not expect a material impact on the Company's consolidated financial statements. Income Tax Disclosures On December 14, 2023, the FASB issued ASU 2023-09, “Improvements to Income Tax Disclosures.” This ASU requires disaggregated information about a reporting entity’s effective tax rate reconciliation, as well as information on income taxes paid. The standard is intended to benefit investors by providing more detailed income tax disclosures that would be useful in making capital allocation decisions. The Company will adopt this standard prospectively on January 1, 2025 and does not expect a material impact on the Company's consolidated financial statements.
Fair Value Measurement	Assets and Liabilities Measured at Fair Value on a Recurring Basis Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Fair value accounting utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 – Quoted prices in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; and Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity). The Company’s financial instruments include cash, restricted cash, accounts receivable, accounts payable and current accrued liabilities. These instruments are carried at cost, which approximates fair value due to the short-term maturities of the instruments. Allowances for doubtful accounts are recorded against the accounts receivable balance to estimate net realizable value.

MARKETABLE SECURITIES (Tables)

MARKETABLE SECURITIES (Tables)	12 Months Ended
MARKETABLE SECURITIES (Tables)	Dec. 31, 2023
Cash and Cash Equivalents [Abstract]
Marketable Securities	The following table summarizes our marketable securities by significant investment categories: Cost Basis Gross Unrealized Losses Gross Unrealized Gains Fair Value December 31, 2023 Marketable debt securities (1) $ 106,791 $ — $ 675 $ 107,466 Marketable equity securities 28,159 (2,581) — 25,578 Total marketable securities $ 134,950 $ (2,581) $ 675 $ 133,044 December 31, 2022 Marketable debt securities (1) $ 11,435 $ (310) $ — $ 11,125 Marketable equity securities 2,876 (1,809) — 1,067 Total marketable securities $ 14,311 $ (2,119) $ — $ 12,192 (1) As of December 31, 2023 and 2022, marketable debt securities are comprised primarily of U.S. Treasury Bills and Government Agency Bonds.

RECEIVABLES (Tables)

RECEIVABLES (Tables)	12 Months Ended
RECEIVABLES (Tables)	Dec. 31, 2023
Receivables [Abstract]
Summary of Trade, and Notes Receivables	The components of trade and other receivables are as follows: December 31, 2023 2022 Trade receivables $ 406 $ 92 Notes receivable, net 343 343 Other 67 84 Total receivables $ 816 $ 519

INVENTORIES (Tables)

INVENTORIES (Tables)	12 Months Ended
INVENTORIES (Tables)	Dec. 31, 2023
Inventory Disclosure [Abstract]
Schedule of Inventory, Current	December 31, 2023 2022 Concentrates and work-in-progress $ 35,807 $ 35,476 Inventory of ore in stockpiles 3,072 940 Raw materials and consumables 1,841 4,204 Total inventories $ 40,720 $ 40,620

INVESTMENTS ACCOUNTED FOR AT _2

INVESTMENTS ACCOUNTED FOR AT FAIR VALUE (Tables)	12 Months Ended
INVESTMENTS ACCOUNTED FOR AT FAIR VALUE (Tables)	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring	September 30, 2023 2022 Current assets $ 7,522 $ 16,586 Non-current assets $ 31,717 $ 17,437 Current liabilities $ 3,589 $ 2,285 Non-current liabilities $ 319 $ — Twelve Months Ended September 30, 2023 2022 2021 Loss from continuing operations $ (8,817) $ (23,103) $ (4,253) Net loss and net loss attributable to the entity $ (8,902) $ (17,890) $ (4,570) In accordance with Rule 4-08(g), summarized financial information for Virginia Energy is set forth below on a one-quarter lag. Virginia Energy prepares its financial statements in accordance with IFRS. The Company determined that no adjustments to Virginia Energy’s summarized financial information were necessary to address differences between IFRS and GAAP that materially impact the summarized financial information. January 23, 2023 September 30, 2022 Current assets $ 133 $ 163 Non-current assets $ 4,253 $ 3,753 Current liabilities $ 2 $ 223 Non-current liabilities $ 2 $ 2 For the Period October 1, 2022 to January 23, 2023 Twelve Months Ended September 30, 2022 2021 Loss from continuing operations, net loss and net loss attributable to the entity $ (226) $ (371) $ (275) The following tables set forth the fair value of the Company’s assets and liabilities measured at fair value on a recurring basis (at least annually) by level within the fair value hierarchy. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Level 1 Level 2 Level 3 Total December 31, 2023 Cash equivalents (1) $ — $ 40,512 $ — $ 40,512 Marketable equity securities 25,554 24 — 25,578 Marketable debt securities — 107,466 — 107,466 $ 25,554 $ 148,002 $ — $ 173,556 December 31, 2022 Cash equivalents (1) $ — $ 30,336 $ — $ 30,336 Investments accounted for at fair value 19,263 66 — 19,329 Marketable equity securities 1,033 34 — 1,067 Marketable debt securities — 11,125 — 11,125 $ 20,296 $ 41,561 $ — $ 61,857 (1) Cash and cash equivalents are comprised of U.S. Treasury Bills, Government Agency Bonds, U.S. Non-Redeemable Term Deposits and mutual funds purchased within three months of their maturity date. Changes in Level 3 Fair Value Measurements The following table is a reconciliation of the beginning and ending balance recorded for the Convertible Note classified as Level 3 in the fair value hierarchy: Beginning balance, February 14, 2023 $ 59,457 Principal redeemed and sale (60,887) Realized gain included in other income (loss) 1,430 Ending balance, December 31, 2023 $ —

PROPERTY, PLANT AND EQUIPMENT_2

PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	The following is a summary of property, plant and equipment, net: Estimated December 31, Useful Lives 2023 2022 Land N/A $ 642 $ 642 Plant facilities 12 - 15 years 29,750 29,509 Mining equipment 5 years 13,019 10,560 Light trucks and utility vehicles 5 years 3,256 2,867 Office furniture and equipment 4 - 7 years 1,754 1,585 Construction-in-progress N/A 13,627 673 Total property, plant and equipment $ 62,048 $ 45,836 Less: accumulated depreciation (35,925) (33,174) Property, plant and equipment, net $ 26,123 $ 12,662 As of December 31, 2022, the net book value of the property, plant and equipment attributable Alta Mesa, which the Company sold to enCore effective February 14, 2023, was $8.21 million and is included in Property, plant and equipment and other assets held for sale, net on the Consolidated Balance Sheet.
Schedule of Summary of Mineral Properties	The following is a summary of mineral properties: December 31, 2023 2022 Sheep Mountain $ 34,183 $ 34,183 Bahia Project 29,130 — Nichols Ranch ISR Project 25,974 25,974 Roca Honda 22,095 22,095 Pinyon Plain 6,512 — Other 1,687 1,287 Mineral properties total $ 119,581 $ 83,539

ASSET RETIREMENT OBLIGATIONS _2

ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables)	12 Months Ended
ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables)	Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Change in Asset Retirement Obligation	The following table summarizes the Company’s asset retirement obligations: December 31, 2023 2022 Asset retirement obligations, beginning of period $ 9,595 $ 13,687 Revision of estimate 214 (238) Accretion of liabilities 1,192 1,556 Held for sale (1) — (5,410) Disposal of Alta Mesa asset retirement obligations (1) (79) — Asset retirement obligations, end of period $ 10,922 $ 9,595 (1) Asset retirement obligations held for sale as of December 31, 2022 were related to Alta Mesa and are included as Asset retirement obligation and other liabilities held for sale on the Consolidated Balance Sheet. Disposal of Alta Mesa retirement obligations is related to the accretion expense incurred on these obligations through the closing date and is included within Gain on sale of assets on the Consolidated Statements of Operations and Comprehensive Income (Loss). See Note 7 – Property, Plant and Equipment and Mineral Properties for more information.
Schedule of Restricted Cash and Cash Equivalents	The following table summarizes the Company’s restricted cash: December 31, 2023 2022 Restricted cash, beginning of period $ 17,449 $ 20,305 Additional collateral posted 130 734 Held for sale — (3,590) Restricted cash, end of period $ 17,579 $ 17,449

CAPITAL STOCK (Tables)

CAPITAL STOCK (Tables)	12 Months Ended
CAPITAL STOCK (Tables)	Dec. 31, 2023
Stockholders' Equity Note [Abstract]
Schedule of Stockholders' Equity Note, Warrants or Rights	The following table summarizes the Company’s share purchase warrants denominated in U.S. dollars. These warrants are accounted for as derivative liabilities, as the functional currency of the entity issuing the warrants, Energy Fuels Inc., is Cdn$. Month Issued Expiry Date Exercise Price Warrants Fair value as of December 31, 2023 September 2016 (1) September 20, 2021 $ 2.45 — $ — (1) The warrants issued in September 2016 were classified as Level 1 under the fair value hierarchy. Each warrant was exercisable until September 20, 2021 and entitled the holder thereof to acquire one common share upon exercise at an exercise price of $2.45 per common share. These warrants are accounted for as a derivative liability, as the functional currency of the entity issuing the warrant is Cdn$.

BASIC AND DILUTED LOSS PER COMM

BASIC AND DILUTED LOSS PER COMMON SHARE (Tables)	12 Months Ended
BASIC AND DILUTED LOSS PER COMMON SHARE (Tables)	Dec. 31, 2023
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	The following is a reconciliation of weighted average common shares outstanding: Years Ended December 31, 2023 2022 2021 Issued shares at beginning of period 157,682,531 156,262,199 134,311,033 Effect of stock options exercised 105,819 155,509 474,072 Effect of shares issued for settlement of vesting of restricted stock units 290,390 335,546 443,364 Effect of shares issued for settlement of exercises of stock appreciation rights 120,291 2,679 2,316 Effect of shares issued for exercise of share purchase warrants — — 1,737,981 Effect of shares issued for consulting services 42,202 16,064 35,933 Effect of shares issued in public offerings 865,806 571,253 9,899,825 Weighted average common shares outstanding 159,107,039 157,343,250 146,904,524
Schedule of Earnings Per Share, Basic and Diluted	The calculation of basic and diluted income (loss) per share after adjustment for the effects of all potential dilutive common shares, calculated as follows: Years Ended December 31, 2023 2022 2021 Net income (loss) attributable to owners of the Company $ 99,862 $ (59,849) $ 1,541 Basic weighted average common shares outstanding 159,107,039 157,343,250 146,904,524 Dilutive impact of stock options, restricted stock units, and warrants 1,047,001 — 2,816,593 Diluted weighted average common shares outstanding 160,154,040 157,343,250 149,721,117 Basic net income (loss) per common share $ 0.63 $ (0.38) $ 0.01 Diluted net income (loss) per common share $ 0.62 $ (0.38) $ 0.01

SHARE-BASED PAYMENTS (Tables)

SHARE-BASED PAYMENTS (Tables)	12 Months Ended
SHARE-BASED PAYMENTS (Tables)	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Deferred Compensation Arrangement with Individual, Share-Based Payments	The Company’s share-based compensation expense, by type of award, is as follows: Years Ended December 31, 2023 2022 2021 RSUs (1) $ 2,595 $ 2,244 $ 1,562 SARs 1,583 2,038 273 Stock options 447 359 323 Total share-based compensation expense (2) $ 4,625 $ 4,641 $ 2,158 (1) The fair value of the RSUs granted under the Compensation Plan for the years ended December 31, 2023, 2022 and 2021 was estimated at the date of grant, using the stated market price on the NYSE American. (2) Share-based compensation is recorded in Selling, general and administration in the Consolidated Statements of Operations and Comprehensive Income (Loss).
Share-Based Payment Arrangement, Restricted Stock Unit, Activity	A summary of the Company’s RSU unvested activity is as follows: Number of Shares Weighted Average Grant Date Fair Value Unvested, December 31, 2020 1,094,056 $ 1.98 Granted 441,241 3.89 Vested (635,233) 1.94 Forfeited — — Unvested, December 31, 2021 900,064 $ 2.94 Granted 411,467 6.52 Vested (518,856) 2.93 Forfeited (45,250) 5.40 Unvested, December 31, 2022 747,425 $ 4.77 Granted 450,232 7.36 Vested (448,883) 4.24 Forfeited (106,935) 7.03 Unvested, December 31, 2023 641,839 $ 6.57
Share-Based Payment Arrangement, Stock Appreciation Right, Valuation Assumptions	The following table with the following weighted average assumptions used to determine fair values: Years Ended December 31, 2023 2022 Risk-free interest rate 3.58 % 1.68 % Expected life (in years) (1) 5.00 years 4.98 years Expected volatility (2) 55.00 % 72.81 % Expected dividend yield — % — % Weighted average grant date fair value $ 3.45 $ 3.99 (1) Monte Carlo analysis of SARs assumes employee suboptimal exercise at first vesting time for each tranche. (2) Expected volatility is measured based on the Company’s historical share price volatility over a period equivalent to the expected life of the SARs.
Share-based Payment Arrangement, Stock Appreciation Right, Activity	A summary of the Company’s SARs activity is as follows: Number of Shares Weighted Average Weighted Average Remaining Contractual Life (Years) Intrinsic Value Outstanding, December 31, 2020 1,720,623 $ 2.92 Exercised (48,201) 2.92 Outstanding, December 31, 2021 1,672,422 $ 2.92 Granted 833,315 6.47 Exercised (6,730) 2.92 Forfeited (46,239) 5.95 Outstanding, December 31, 2022 2,452,768 $ 4.07 Granted 308,333 7.36 Exercised (842,107) 2.92 Forfeited (79,466) 7.30 Expired — — Outstanding, December 31, 2023 1,839,528 $ 5.01 1.86 $ 4,056 Exercisable, December 31, 2023 250,036 $ 2.92 0.06 $ 1,068 A summary of the Company’s unvested SARs activity is as follows: Number of Shares Weighted Average Grant Date Fair Value Unvested, December 31, 2020 1,720,623 $ 1.25 Granted — — Vested (1,147,074) 1.27 Forfeited — — Unvested, December 31, 2021 573,549 $ 1.19 Granted 833,315 3.99 Vested — — Forfeited (46,239) 4.13 Unvested, December 31, 2022 1,360,625 $ 2.81 Granted 308,333 3.45 Vested — — Forfeited (79,466) 3.58 Unvested, December 31, 2023 1,589,492 $ 2.89
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The fair value of the stock options granted under the Compensation Plan is estimated at the date of grant, using the Black-Scholes Option Valuation Model, with the following weighted average assumptions: Years Ended December 31, 2023 2022 2021 Risk-free interest rate 3.98 % 2.43 % 0.44 % Expected life (in years) 3.2 years 3.2 years 5.0 years Expected volatility (1) 74.00 % 73.21 % 61.96 % Expected dividend yield — % — % — % Weighted average grant date fair value $ 3.80 $ 4.93 $ 2.06 (1) Expected volatility is measured based on the Company’s historical share price volatility over a period equivalent to the expected life of the stock options.
Schedule of share-based compensation, stock options, activity	A summary of the Company’s stock option activity is as follows: Range of Exercise Prices Number of Shares Weighted Average Weighted Average Remaining Contractual Life (Years) Intrinsic Value Outstanding, December 31, 2020 $1.70 - $15.61 1,609,087 $ 2.91 Granted 3.89 - 8.41 169,310 3.99 Exercised 1.70 - 7.42 (775,814) 2.95 Forfeited 1.76 - 5.91 (8,048) 3.16 Expired 1.70 - 15.61 (51,653) 8.14 Outstanding, December 31, 2021 $1.70 - $8.41 942,882 $ 2.79 Granted 5.84 - 10.03 118,318 6.52 Exercised 1.70 - 5.46 (256,315) 2.93 Forfeited 3.06 - 10.03 (20,700) 5.91 Expired 1.76 - 5.18 (16,507) 2.52 Outstanding, December 31, 2022 $1.70 - $8.41 767,678 $ 3.24 Granted 5.34 - 8.60 153,299 7.20 Exercised 1.70 - 6.47 (348,538) 2.83 Forfeited 3.89 - 7.36 (32,250) 6.74 Expired 1.76 - 6.47 (16,720) 3.75 Outstanding, December 31, 2023 $1.76 - $8.60 523,469 $ 4.48 2.31 $ 1,448 Exercisable, December 31, 2023 $1.76 - $8.41 354,286 $ 3.24 1.55 $ 1,400 A summary of the Company’s unvested stock option activity is as follows: Number of Shares Weighted Average Grant Date Fair Value Unvested, December 31, 2020 403,990 $ 0.94 Granted 169,310 2.06 Vested (351,934) 1.23 Forfeited (8,049) 1.60 Unvested, December 31, 2021 213,317 $ 1.34 Granted 118,318 4.93 Vested (170,349) 1.15 Forfeited (20,700) 4.54 Unvested, December 31, 2022 140,586 $ 4.12 Granted 153,299 3.71 Vested (92,453) 3.57 Forfeited (32,250) 3.78 Unvested, December 31, 2023 169,182 $ 4.11

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
INCOME TAXES (Tables)	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of income tax expense (benefit) and the product of accounting income before income tax, multiplied by the combined Canadian federal and provincial income tax rate (the rate applicable to the Canadian parent company) is as follows: Years Ended December 31, 2023 2022 2021 Income (loss) before income taxes $ 100,032 $ (59,944) $ 1,448 Combined federal and provincial rate 26.5 % 26.5 % 26.5 % Expected income tax (benefit) 26,508 (15,885) 384 Share-based compensation (893) 572 (89) Other non-deductible/non-taxable items 2,015 3,977 159 Unrecognized deferred tax assets (27,354) 11,336 (454) Income tax expense $ 276 $ — $ —
Schedule of Deferred Tax Assets and Liabilities	The components of the net deferred tax assets as of December 31, 2023 and 2022 are as follows: Years Ended December 31, 2023 2022 Inventories $ 547 $ 5,984 Short-term investments 209 209 Operating loss carry forwards 93,241 108,827 Capital loss carry forwards 849 881 Deferred revenue and other 2,431 5,433 Mineral properties and deferred costs, United States 16,872 18,727 Mineral properties and deferred costs, Canada 1,726 1,815 Asset retirement obligations 2,894 3,976 Property, plant and equipment 986 1,079 Total deferred tax assets $ 119,755 $ 146,931 Less: valuation allowance (119,755) (146,931) Net deferred tax assets $ — $ —
Summary of Valuation Allowance	The following table summarizes the changes to the valuation allowance: For the Years Ended Balance Balance December 31, Beginning of Period Additions (1) Deductions (2) End of Period 2023 $ 146,931 $ — $ (27,176) $ 119,755 2022 $ 135,503 $ 11,927 $ (499) $ 146,931 (1) There were no additions to the valuation allowance for the year ended December 31, 2023. For the year ended December 31, 2022, additions to the valuation allowance were due to additional losses incurred and increases to other tax assets such as mineral property, reclamation obligations and deferred revenue. (2) For the year ended December 31, 2023, the reductions to the valuation allowance were due to the utilization of loss carryforwards and the decrease to tax assets such as inventory, mineral property and property, plant and equipment. For the year ended December 31, 2022, the reductions to the valuation allowance are primarily due to the decreases to other tax assets such as inventories.
Summary of Operating Loss Carryforwards	The following table summarizes the Company's capital losses and net operating losses as of December 31, 2023 that can be applied against future taxable profit. Country Type Amount Expiry Date Canada Non-capital losses $ 51,555 2027 - 2039 Canada Allowable capital losses $ 3,204 None Canada Investment tax credits $ 1,165 2023-2027 United States Pre-2018 net operating losses $ 194,499 2026-2036 United States Post-2017 net operating losses $ 105,802 None
Schedule of Income before Income Tax, Domestic and Foreign	For financial reporting purposes, income before taxes includes the following components: Years Ended December 31, 2023 2022 2021 Canada $ (5,229) $ (23,964) $ (7,549) Foreign 105,261 (35,980) 8,997 Total $ 100,032 $ (59,944) $ 1,448

SUPPLEMENTAL FINANCIAL INFORM_2

SUPPLEMENTAL FINANCIAL INFORMATION (Tables)	12 Months Ended
SUPPLEMENTAL FINANCIAL INFORMATION (Tables)	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedules of Concentration of Risk, by Risk Factor	The Company’s sales to major customers (purchases in excess of 10% of total sales) are as follows: Years Ended December 31, 2023 2022 2021 Customer 1 $ 18,470 $ — $ — Customer 2 10,472 — — Customer 3 4,335 — — Customer 4 2,848 2,592 1,385 Customer 5 866 8,778 — Customer 6 — 445 1,571 The Company’s revenues by country of customer are as follows: Years Ended December 31, 2023 2022 2021 U.S. $ 34,514 $ 9,473 $ 1,721 Estonia 2,848 2,592 1,385 Other 566 450 78 Total revenues $ 37,928 $ 12,515 $ 3,184 The Company’s outstanding trade receivables from its major customers are as follows: December 31, 2023 2022 Customer 1 $ 291 $ — The Company’s outstanding trade receivables by country of customer are as follows: December 31, 2023 2022 U.S. $ 115 $ 92 Estonia 291 — Total trade receivables $ 406 $ 92
Schedule of Other Nonoperating Income (Expense)	The components of other income (loss) are as follows: Years Ended December 31, 2023 2022 2021 Unrealized gain (loss) on investments $ 15,472 $ (16,808) $ 6,311 Realized loss on investments (10,491) — — Unrealized gain (loss) on marketable securities (530) (456) 795 Realized gain on maturities of marketable securities 1,141 — — Realized gain on convertible note 1,430 — — Change in value of warrant liabilities — — (8,078) Foreign exchange gain (loss) 423 2,058 (128) Department of Energy awards — — 1,900 Interest income, net and other 5,697 (166) 340 Other income (loss) $ 13,142 $ (15,372) $ 1,140
Schedule of Accounts Payable and Accrued Liabilities	The components of accounts payable and accrued liabilities are as follows: December 31, 2023 2022 Accounts payable $ 1,006 $ 1,850 Accrued operating expenses 4,391 1,783 Accrued payroll liabilities 4,162 2,929 Accrued capital expenditures 205 22 Accrued taxes 393 240 Other accrued liabilities 4 105 Total accounts payable and accrued liabilities $ 10,161 $ 6,929

FAIR VALUE ACCOUNTING (Tables)

FAIR VALUE ACCOUNTING (Tables)	12 Months Ended
FAIR VALUE ACCOUNTING (Tables)	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring	September 30, 2023 2022 Current assets $ 7,522 $ 16,586 Non-current assets $ 31,717 $ 17,437 Current liabilities $ 3,589 $ 2,285 Non-current liabilities $ 319 $ — Twelve Months Ended September 30, 2023 2022 2021 Loss from continuing operations $ (8,817) $ (23,103) $ (4,253) Net loss and net loss attributable to the entity $ (8,902) $ (17,890) $ (4,570) In accordance with Rule 4-08(g), summarized financial information for Virginia Energy is set forth below on a one-quarter lag. Virginia Energy prepares its financial statements in accordance with IFRS. The Company determined that no adjustments to Virginia Energy’s summarized financial information were necessary to address differences between IFRS and GAAP that materially impact the summarized financial information. January 23, 2023 September 30, 2022 Current assets $ 133 $ 163 Non-current assets $ 4,253 $ 3,753 Current liabilities $ 2 $ 223 Non-current liabilities $ 2 $ 2 For the Period October 1, 2022 to January 23, 2023 Twelve Months Ended September 30, 2022 2021 Loss from continuing operations, net loss and net loss attributable to the entity $ (226) $ (371) $ (275) The following tables set forth the fair value of the Company’s assets and liabilities measured at fair value on a recurring basis (at least annually) by level within the fair value hierarchy. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Level 1 Level 2 Level 3 Total December 31, 2023 Cash equivalents (1) $ — $ 40,512 $ — $ 40,512 Marketable equity securities 25,554 24 — 25,578 Marketable debt securities — 107,466 — 107,466 $ 25,554 $ 148,002 $ — $ 173,556 December 31, 2022 Cash equivalents (1) $ — $ 30,336 $ — $ 30,336 Investments accounted for at fair value 19,263 66 — 19,329 Marketable equity securities 1,033 34 — 1,067 Marketable debt securities — 11,125 — 11,125 $ 20,296 $ 41,561 $ — $ 61,857 (1) Cash and cash equivalents are comprised of U.S. Treasury Bills, Government Agency Bonds, U.S. Non-Redeemable Term Deposits and mutual funds purchased within three months of their maturity date. Changes in Level 3 Fair Value Measurements The following table is a reconciliation of the beginning and ending balance recorded for the Convertible Note classified as Level 3 in the fair value hierarchy: Beginning balance, February 14, 2023 $ 59,457 Principal redeemed and sale (60,887) Realized gain included in other income (loss) 1,430 Ending balance, December 31, 2023 $ —

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Impairment of plant and equipment and mineral properties	$ 0	$ 0	$ 0
Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	15 years

MARKETABLE SECURITIES - Schedul

MARKETABLE SECURITIES - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Marketable debt securities
Cost Basis	$ 106,791	$ 11,435
Gross Unrealized Losses	0	(310)
Gross Unrealized Gains	675	0
Fair Value	107,466	11,125
Marketable equity securities
Cost Basis	28,159	2,876
Gross Unrealized Losses	(2,581)	(1,809)
Gross Unrealized Gains	0	0
Fair Value	25,578	1,067
Cost Basis	134,950	14,311
Gross Unrealized Losses	(2,581)	(2,119)
Gross Unrealized Gains	675	0
Fair Value	$ 133,044	$ 12,192

RECEIVABLES (Details)

RECEIVABLES (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2018 USD ($)	Nov. 07, 2018 USD ($)	Dec. 31, 2014 USD ($) note
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 406	$ 92
Notes receivable, net	343	343
Other	67	84
Total receivables	816	519
Number of notes receivables \| note					2
Financing receivable, principal amount			$ 500	$ 550	$ 1,050
Financing receivable, reserve against collectability	$ 220	$ 220

INVENTORIES - Schedule of Inven

INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Concentrates and work-in-progress	$ 35,807	$ 35,476
Inventory of ore in stockpiles	3,072	940
Raw materials and consumables	1,841	4,204
Total inventories	$ 40,720	$ 40,620

INVESTMENTS ACCOUNTED FOR AT _3

INVESTMENTS ACCOUNTED FOR AT FAIR VALUE (Details) $ / shares in Units, $ in Thousands, $ in Thousands, $ in Thousands						12 Months Ended
	Dec. 05, 2023 shares	Nov. 29, 2023 AUD ($) shares	Oct. 19, 2023 CAD ($) $ / shares shares	Jan. 24, 2023 shares	Oct. 27, 2021	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change In Value Of Investments Accounted At Fair Value \| $						$ 15,472
Investments (Note 6) \| $						1,356	$ 19,329
Business Acquisition, Number Of Common Stock Shares Acquired	8,501,424
Consolidated Uranium Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of fair value investment					19.90%		17.40%
Virginia Uranium, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of fair value investment							13.50%
Consolidated Uranium Inc. And Virginia Energy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change In Value Of Investments Accounted At Fair Value \| $						4,980	$ (16,808)	$ 6,311
IsoEnergy Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Number of Common Stock Shares Acquired			406,650
Tate Transition Metals Ltd
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of fair value investment		19.90%
Subscription Agreement, Shares Issued		199,000
Subscription Agreement, Purchase Price \| $		$ 1,990
IsoEnergy Ltd. \| Private Placement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of shares issued (in shares)			8,134,500
Sale of stock, price per share (in USD per share) \| $ / shares			$ 4.50
Virginia Uranium, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Acquisition, Shares Converted				16,189,548
Virginia Uranium, Inc. \| CUR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired				100%
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share				0.26
Business Combination, Number of Common Stock Shares Acquired				9,439,857
Business Combination, Acquired Shares Converted To Common Stock				2,454,362
Virginia Uranium, Inc. \| IsoEnergy Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share	0.500
IsoEnergy Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total purchase price \| $			$ 1,830
CUR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	5%			16.70%
Level 1 \| Consolidated Uranium Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments accounted for at fair value \| $						23,630	16,500
Level 1 \| Virginia Uranium, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments accounted for at fair value \| $						$ 3,390	$ 2,830

INVESTMENTS ACCOUNTED FOR AT _4

INVESTMENTS ACCOUNTED FOR AT FAIR VALUE - Schedule of Fair Value Investments (Details) - USD ($) $ in Thousands	4 Months Ended	12 Months Ended
	Jan. 23, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current assets		$ 232,695	$ 135,590
Current liabilities		10,360	18,624
Net loss and net loss attributable to the entity		106	95	$ 93
Consolidated Uranium Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current assets					$ 7,522	$ 16,586
Non-current assets					31,717	17,437
Current liabilities					3,589	2,285
Non-current liabilities					$ 319	0
Loss from continuing operations		(8,817)	(23,103)	(4,253)
Net loss and net loss attributable to the entity		$ (8,902)	(17,890)	(4,570)
Virginia Uranium, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current assets	$ 133					163
Non-current assets	4,253					3,753
Current liabilities	2					223
Non-current liabilities	2					$ 2
Loss from continuing operations	$ (226)		$ (371)	$ (275)

PROPERTY, PLANT AND EQUIPMENT_3

PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 62,048	$ 45,836
Less: accumulated depreciation	(35,925)	(33,174)
Property, Plant and Equipment, Net, Total	$ 26,123	12,662
Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	15 years
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 642	642
Plant facilities
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 29,750	29,509
Plant facilities \| Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	12 years
Plant facilities \| Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	15 years
Mining equipment
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Total property, plant and equipment	$ 13,019	10,560
Light trucks and utility vehicles
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Total property, plant and equipment	$ 3,256	2,867
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,754	1,585
Office furniture and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	4 years
Office furniture and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	7 years
Construction-in-progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 13,627	$ 673

PROPERTY, PLANT AND EQUIPMENT_4

PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Narrative) (Details)								12 Months Ended
	May 03, 2023 USD ($)	Feb. 14, 2023 USD ($) subsidiary $ / shares	Feb. 10, 2023 USD ($) purchaseAgreement	May 19, 2022 USD ($) mi mineralConcession a	Nov. 22, 2021 USD ($) $ / shares shares	Oct. 27, 2021 USD ($) shares	Oct. 27, 2021 CAD ($) $ / shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Depletion, depreciation and amortization								$ 2,751,000	$ 3,269,000	$ 3,189,000
Number Of Purchase Agreements \| purchaseAgreement			2
Purchase Agreements, Number Of Mineral Concessions Acquired \| mineralConcession				17
Purchase Agreement, Acres To Purchase \| a				37,300
Purchase Agreement, Miles To Purchase \| mi				58.3
Purchase Agreement, Purchase Price				$ 27,500,000
Purchase Agreement, Deposit Payment				$ 5,900,000
Purchase Agreement, Payment Due At Closing			$ 21,600,000
Purchase Agreement, Direct Deal Costs								1,630,000
Disposal Group, Shares Received In Transaction \| shares					1,875,085	11,860,101
Disposal Group, Shares Received In Transaction, Price Per Share \| $ / shares							$ 2.95
Disposal Group, Production Payment Commitment							$ 5,000,000
Sales and property tax refunds						$ 35,730,000
Settlement of Asset Retirement Obligations Through Noncash Payments, Amount						270,000
Disposal Group, Warrants Issued \| shares					937,542
Disposal Group, Warrants Issued, Price Per Share \| $ / shares					$ 4
Disposal Group, Proceeds For Payment Agreement					$ 1,970,000
Gain on sale of assets								119,257,000	366,000	35,733,000
Less: restricted cash related to assets held for sale								$ 0	$ 3,590,000	0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]								Gain on sale of assets
Alta Mesa Divestiture
Property, Plant and Equipment [Line Items]
Proceeds from Sale of Productive Assets	$ 3,100,000
Disposal Group, Including Discontinued Operation, Consideration		$ 120,000,000
Noncash or Part Noncash Divestiture, Amount of Consideration Received		$ 60,000,000
Convertible Note Receivable, Term		2 years
Convertible Notes Receivable, Conversion Price Per Share \| $ / shares		$ 2.9103
Convertible Notes Receivable, Premium		20%
Gain on sale of assets		$ 116,500,000
Disposal Group, Cash To Be Received		119,460,000
Proceeds from Divestiture of Interest in Consolidated Subsidiaries		60,000,000
Notes Receivable, Amortized cost		59,460,000
Disposal Group, Including Discontinued Operation, Assets		3,400,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	2,750,000
Payments to Acquire Other Property, Plant, and Equipment	500,000
Property, plant and equipment, held-for-sale	$ 350,000
Disposal Group, Including Discontinued Operation, Property, Plant And Equipment, Usage Period	20 years
Convertible Notes Receivable, Conversion Limitation Per Transaction		$ 10,000,000
Number of subsidiaries sold \| subsidiary		3
Disposal Group, Cash Due Prior To Closing		$ 6,000,000
Disposal Group, Cash Due At Closing		$ 54,000,000
Second Payment
Property, Plant and Equipment [Line Items]
Disposal Group, Deferred Cash Receivable							3,000,000
Third Payment
Property, Plant and Equipment [Line Items]
Disposal Group, Deferred Cash Receivable							$ 3,000,000
Consolidated Uranium Inc.
Property, Plant and Equipment [Line Items]
Proceeds from Sale of Productive Assets						$ 2,000,000
Percentage of fair value investment						19.90%			17.40%
Land
Property, Plant and Equipment [Line Items]
Depreciation								$ 100,000	$ 240,000	$ 100,000
Alta Mesa
Property, Plant and Equipment [Line Items]
Property, plant and equipment, held-for-sale								$ 8,210,000

PROPERTY, PLANT AND EQUIPMENT_5

PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Summary of Mineral Properties (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Mineral properties	$ 119,581	$ 83,539
Sheep Mountain
Property, Plant and Equipment [Line Items]
Mineral properties	34,183	34,183
Bahia Project
Property, Plant and Equipment [Line Items]
Mineral properties	29,130	0
Nichols Ranch ISR Project
Property, Plant and Equipment [Line Items]
Mineral properties	25,974	25,974
Roca Honda
Property, Plant and Equipment [Line Items]
Mineral properties	22,095	22,095
Pinyon Plain
Property, Plant and Equipment [Line Items]
Mineral properties	6,512	0
Other
Property, Plant and Equipment [Line Items]
Mineral properties	$ 1,687	$ 1,287

ASSET RETIREMENT OBLIGATIONS _3

ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH - Schedule of Change in Asset Retirement Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligations, beginning of period	$ 9,595	$ 13,687
Revision of estimate	214	(238)
Accretion of liabilities	1,192	1,556	$ 1,284
Held for sale	0	5,410
Disposal of Alta Mesa asset retirement obligations(1)	(79)	0
Asset retirement obligations, end of period	$ 10,922	$ 9,595	$ 13,687

ASSET RETIREMENT OBLIGATIONS _4

ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 27, 2021	Dec. 31, 2023	Dec. 31, 2022
Schedule of Asset Retirement Obligations [Line Items]
Undiscounted decommissioning liability		$ 33,380	$ 42,910
Revision of estimate		$ (214)	$ 238
Settlement of Asset Retirement Obligations Through Noncash Payments, Amount	$ 270
Minimum
Schedule of Asset Retirement Obligations [Line Items]
Risk Free Rate		11.62%
Inflation rate		2.25%
Maximum
Schedule of Asset Retirement Obligations [Line Items]
Risk Free Rate		12.88%
Inflation rate		3.97%

ASSET RETIREMENT OBLIGATIONS _5

ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH - Schedule of Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restricted Cash And Cash Equivalents [Roll Forward]
Restricted cash, beginning of period	$ 17,449	$ 20,305
Additional collateral posted	130	734
Held for sale	0	(3,590)	$ 0
Restricted cash, end of period	$ 17,579	$ 17,449	$ 20,305

CAPITAL STOCK - Narrative (Deta

CAPITAL STOCK - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 20, 2021
Class of Warrant or Right [Line Items]
Number of warrants outstanding (in shares)				149,807
At The Market Sale Of Stock
Class of Warrant or Right [Line Items]
Number of shares issued (in shares)	4,047,832	769,779	16,627,512
Sale of stock consideration received	$ 31,810	$ 7,890	$ 106,210

CAPITAL STOCK - Schedule of Sto

CAPITAL STOCK - Schedule of Stockholders' Equity Note, Warrants or Rights (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Sep. 20, 2021
Class of Warrant or Right [Line Items]
Number of warrants outstanding (in shares)		149,807
Share Purchase Warrants Denominated in United States Dollars \| September 20, 2021 Expiration Date
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share)	$ 2.45
Number of warrants outstanding (in shares)	0
Fair value of warrants	$ 0

BASIC AND DILUTED INCOME (LOS_2

BASIC AND DILUTED INCOME (LOSS) PER COMMON SHARE - Schedule of Weighted Average Shares (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Issued common shares at beginning of period (in shares)	157,682,531	156,262,199	134,311,033
Effect of stock options exercised	105,819	155,509	474,072
Effect of shares issued for settlement of vesting of restricted stock units	290,390	335,546	443,364
Effect of shares issued for settlement of exercises of stock appreciation rights	120,291	2,679	2,316
Effect of shares issued for exercise of share purchase warrants	0	0	1,737,981
Effect of shares issued for consulting services	42,202	16,064	35,933
Basic weighted average number of common shares outstanding (in shares)	159,107,039	157,343,250	146,904,524
Public Offerings
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Effect of shares issued in public offerings	865,806	571,253	9,899,825

BASIC AND DILUTED INCOME (LOS_3

BASIC AND DILUTED INCOME (LOSS) PER COMMON SHARE - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income (loss) attributable to owners of the Company	$ 99,862	$ (59,849)	$ 1,541
Basic weighted average number of common shares outstanding (in shares)	159,107,039	157,343,250	146,904,524
Dilutive impact of stock options, restricted stock units, and warrants (in shares)	1,047,001	0	2,816,593
Diluted weighted average number of common shares outstanding (in shares)	160,154,040	157,343,250	149,721,117
Net income (loss) per Basic share (in dollars per share)	$ 0.63	$ (0.38)	$ 0.01
Diluted net income (loss) per common share (in dollars per share)	$ 0.62	$ (0.38)	$ 0.01

BASIC AND DILUTED INCOME (LOS_4

BASIC AND DILUTED INCOME (LOSS) PER COMMON SHARE - Narrative (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	110	60	6,870
Stock Appreciation Rights (SARs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,850	2,450	1,670

SHARE-BASED PAYMENTS - Narrativ

SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable options, weighted average remaining contractual term	1 year 6 months 18 days
Stock exercised, intrinsic value	$ 1,530	$ 2,230	$ 2,880
Grants in period, weighted average exercise price (in dollars per share)	$ 7.20	$ 6.52	$ 3.99
Exercised during the period, intrinsic value	$ 3,550	$ 50	$ 260
Number of options (in shares)	523,469	767,678	942,882	1,609,087
Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)	16,265,915
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Award exercise period	5 years
Unrecognized compensation costs related to unvested stock options	$ 190
Recognition period for unrecognized compensation costs	1 year 10 days	1 year 10 months 13 days	8 months 1 day
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Grants in period, grant date intrinsic value (in dollars per share)	$ 3,000,000	$ 2,930,000	$ 2,670,000
Unrecognized compensation costs related to RSU awards	$ 840
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years	5 years	5 years
Grants in period, weighted average exercise price (in dollars per share)				$ 1.25
Exercised in period (in shares)	90 days
Unrecognized compensation costs related to RSU awards	$ 310
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average exercise price (in dollars per share)	$ 5.34	$ 5.84	$ 3.89
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average exercise price (in dollars per share)	$ 8.60	10.03	8.41
Maximum \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable options, weighted average remaining contractual term	10 years
Common Stock \| Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average exercise price (in dollars per share)	$ 7.36	6.47	2.92
Share-based Compensation Award, Tranche One \| Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average exercise price (in dollars per share)	$ 12	$ 12	5
Exercised in period (in shares)	90 days	90 days
Share-based Compensation Award, Tranche Two \| Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average exercise price (in dollars per share)	$ 14	$ 14	$ 7
Exercised in period (in shares)			90 days
Share-based Compensation Award, Tranche Three \| Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average exercise price (in dollars per share)	$ 16	$ 16	$ 10
Exercised in period (in shares)			90 days

SHARE-BASED PAYMENTS - Schedule

SHARE-BASED PAYMENTS - Schedule of Valuation Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	3.98%	2.43%	0.44%
Expected life	3 years 2 months 12 days	3 years 2 months 12 days	5 years
Expected volatility	74%	73.21%	61.96%
Expected dividend yield	0%	0%	0%
Weighted average grant date fair value	$ 3.80	$ 4.93	$ 2.06
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	3.58%	1.68%
Expected life	5 years	4 years 11 months 23 days
Expected volatility	55%	72.81%
Expected dividend yield	0%	0%
Weighted average grant date fair value	$ 3.45	$ 3.99

SHARE-BASED PAYMENTS - Schedu_2

SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options, Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning of period (in dollars per share)	$ 3.24	$ 2.79	$ 2.91
Grants in period, weighted average exercise price (in dollars per share)	7.20	6.52	3.99
Exercises in period, weighted average exercise price (in dollars per share)	2.83	2.93	2.95
Forfeitures in period, weighted average exercise price (in dollars per share)	6.74	5.91	3.16
Expirations in period, weighted average exercise price (in dollars per share)	3.75	2.52	8.14
Weighted average exercise price, end of period (in dollars per share)	4.48	$ 3.24	$ 2.79
Exercisable options, weighted average exercise price (in dollars per share)	$ 3.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares)	767,678	942,882	1,609,087
Granted (in shares)	153,299	118,318	169,310
Exercised (in shares)	(348,538)	(256,315)	(775,814)
Forfeited (in shares)	(32,250)	(20,700)	(8,048)
Expired (in shares)	(16,720)	(16,507)	(51,653)
Ending balance (in shares)	523,469	767,678	942,882
Number of exercisable options (in shares)	354,286
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, weighted average remaining contractual life	2 years 3 months 21 days
Exercisable options, weighted average remaining contractual term	1 year 6 months 18 days
Options outstanding, intrinsic value	$ 1,448
Exercisable options, intrinsic value	$ 1,400
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning of period (in dollars per share)	$ 1.70	$ 1.70	$ 1.70
Grants in period, weighted average exercise price (in dollars per share)	5.34	5.84	3.89
Exercises in period, weighted average exercise price (in dollars per share)	1.70	1.70	1.70
Forfeitures in period, weighted average exercise price (in dollars per share)	3.89	3.06	1.76
Expirations in period, weighted average exercise price (in dollars per share)	1.76	1.76	1.70
Weighted average exercise price, end of period (in dollars per share)	1.76	1.70	1.70
Exercisable options, weighted average exercise price (in dollars per share)	1.76
Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning of period (in dollars per share)	8.41	8.41	15.61
Grants in period, weighted average exercise price (in dollars per share)	8.60	10.03	8.41
Exercises in period, weighted average exercise price (in dollars per share)	6.47	5.46	7.42
Forfeitures in period, weighted average exercise price (in dollars per share)	7.36	10.03	5.91
Expirations in period, weighted average exercise price (in dollars per share)	6.47	5.18	15.61
Weighted average exercise price, end of period (in dollars per share)	8.60	$ 8.41	$ 8.41
Exercisable options, weighted average exercise price (in dollars per share)	$ 8.41

SHARE-BASED PAYMENTS - Schedu_3

SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options and Restricted Stock Units Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock-option
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Number of nonvested shares, beginning of period (in shares)	140,586	213,317	403,990
Granted, nonvested, number of shares (in shares)	153,299	118,318	169,310
Vested, number of shares (in shares)	(92,453)	(170,349)	(351,934)
Nonvested options forfeited, number of shares (in shares)	(32,250)	(20,700)	(8,049)
Number of nonvested shares, end of period (in shares)	169,182	140,586	213,317
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share)	$ 4.12	$ 1.34	$ 0.94
Granted, nonvested, weighted average grant date fair value (in dollars per share)	3.71	4.93	2.06
Vested, weighted average grant date fair value (in dollars per share)	3.57	1.15	1.23
Nonvested options forfeited, weighted average grant date fair value (in dollars per share)	3.78	4.54	1.60
Nonvested, weighted average grant date fair value, end of period (in dollars per share)	$ 4.11	$ 4.12	$ 1.34
RSU
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Number of nonvested shares, beginning of period (in shares)	747,425	900,064	1,094,056
Granted, nonvested, number of shares (in shares)	450,232	411,467	441,241
Vested, number of shares (in shares)	(448,883)	(518,856)	(635,233)
Nonvested options forfeited, number of shares (in shares)	(106,935)	(45,250)	0
Number of nonvested shares, end of period (in shares)	641,839	747,425	900,064
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share)	$ 4.77	$ 2.94	$ 1.98
Granted, nonvested, weighted average grant date fair value (in dollars per share)	7.36	6.52	3.89
Vested, weighted average grant date fair value (in dollars per share)	4.24	2.93	1.94
Nonvested options forfeited, weighted average grant date fair value (in dollars per share)	7.03	5.40	0
Nonvested, weighted average grant date fair value, end of period (in dollars per share)	$ 6.57	$ 4.77	$ 2.94

SHARE-BASED PAYMENTS - Schedu_4

SHARE-BASED PAYMENTS - Schedule of Stock Appreciation Rights (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock Appreciation Rights (SARs)
Number of Shares
Beginning balance (in shares)	2,452,768	1,672,422	1,720,623
Granted (in shares)	308,333	833,315
Exercised (in shares)	(842,107)	(6,730)	(48,201)
Forfeited (in shares)	(79,466)	(46,239)
Expired (in shares)	0
Ending balance (in shares)	1,839,528	2,452,768	1,672,422
Exercisable (in shares)	250,036
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 4.07	$ 2.92	$ 2.92
Granted (in dollars per share)	7.36	6.47
Exercised (in dollars per shares)	2.92	2.92	2.92
Forfeited (in dollars per share)	7.30	5.95
Expired (in dollars per share)	0
Ending balance (in dollars per share)	5.01	$ 4.07	$ 2.92
Exercisable (in dollars per share)	$ 2.92
Weighted Average Remaining Contractual Life (Years), Outstanding	1 year 10 months 9 days
Weighted Average Remaining Contractual Life (Years), Exercisable	21 days
Intrinsic Value Outstanding	$ 4,056
Intrinsic Value, Exercisable	$ 1,068
Stock Appreciation Rights, Non-vested
Number of Shares
Beginning balance (in shares)	1,360,625	573,549	1,720,623
Granted (in shares)	308,333	833,315	0
Vested (in dollars per share)	$ 0	$ 0	$ 1.27
Vested (in shares)	0	0	1,147,074
Forfeited (in shares)	(79,466)	(46,239)	0
Ending balance (in shares)	1,589,492	1,360,625	573,549
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 2.81	$ 1.19	$ 1.25
Granted (in dollars per share)	3.45	3.99	0
Forfeited (in dollars per share)	3.58	4.13	0
Ending balance (in dollars per share)	$ 2.89	$ 2.81	$ 1.19

SHARE-BASED PAYMENTS - Schedu_5

SHARE-BASED PAYMENTS - Schedule of Compensation Costs for Share-based Payment Arrangements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 4,625	$ 4,641	$ 2,158
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	447	359	323
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	2,595	2,244	1,562
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1,583	$ 2,038	$ 273

INCOME TAXES - Schedule of Inco

INCOME TAXES - Schedule of Income (Loss) Before Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments, Owned, Federal Income Tax Note [Line Items]
Income (loss) before income taxes	$ 100,032	$ (59,944)	$ 1,448
Canada
Investments, Owned, Federal Income Tax Note [Line Items]
Income (loss) before income taxes	(5,229)	(23,964)	(7,549)
Foreign Tax Authorit
Investments, Owned, Federal Income Tax Note [Line Items]
Income (loss) before income taxes	$ 105,261	$ (35,980)	$ 8,997

INCOME TAXES - Schedule of Effe

INCOME TAXES - Schedule of Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 100,032	$ (59,944)	$ 1,448
Combined federal and provincial rate	26.50%	26.50%	26.50%
Expected income tax (benefit)	$ 26,508	$ (15,885)	$ 384
Share-based compensation	(893)	572	(89)
Other non-deductible/non-taxable items	2,015	3,977	159
Unrecognized deferred tax assets	(27,354)	11,336	(454)
Income tax expense	$ 276	$ 0	$ 0

INCOME TAXES - Schedule of Defe

INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Components of Deferred Tax Assets [Abstract]
Inventories	$ 547	$ 5,984
Short-term investments	209	209
Operating loss carry forwards	93,241	108,827
Capital loss carry forwards	849	881
Deferred revenue and other	2,431	5,433
Mineral properties and deferred costs, United States	16,872	18,727
Mineral properties and deferred costs, Canada	1,726	1,815
Asset retirement obligations	2,894	3,976
Property, plant and equipment	986	1,079
Total deferred tax assets	119,755	146,931
Less: valuation allowance	(119,755)	(146,931)
Net deferred tax assets	$ 0	$ 0

INCOME TAXES - Valuation Allowa

INCOME TAXES - Valuation Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance, Beginning Balance	$ 146,931
Valuation allowance, additions	0	$ 11,927
Valuation allowance, deductions	(27,176)	(499)
Valuation allowance, Ending Balance	119,755	146,931
Valuation Allowance of Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance, Beginning Balance	146,931	135,503
Valuation allowance, Ending Balance	$ 119,755	$ 146,931

INCOME TAXES - Schedule of Capi

INCOME TAXES - Schedule of Capital Losses and Net Operating Losses (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Canada \| Non-capital losses \| Canada
Operating Loss Carryforwards [Line Items]
Amount	$ 51,555
Canada \| Capital losses \| Canada
Operating Loss Carryforwards [Line Items]
Amount	3,204
Canada \| Investment tax credits \| Canada
Operating Loss Carryforwards [Line Items]
Amount	1,165
UNITED STATES \| Pre-2018 Net Operating Losses \| United States
Operating Loss Carryforwards [Line Items]
Amount	194,499
UNITED STATES \| Post-2017 Net Operating Losses \| United States
Operating Loss Carryforwards [Line Items]
Amount	$ 105,802

SUPPLEMENTAL FINANCIAL INFORM_3

SUPPLEMENTAL FINANCIAL INFORMATION - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue, Major Customer [Line Items]
Revenue	$ 37,928	$ 12,515	$ 3,184
Accounts Receivable, after Allowance for Credit Loss	406	92
Sales Revenue, Net \| Customer Concentration Risk \| Customer 1
Revenue, Major Customer [Line Items]
Revenue	18,470	0	0
Sales Revenue, Net \| Customer Concentration Risk \| Customer 2
Revenue, Major Customer [Line Items]
Revenue	10,472	0	0
Sales Revenue, Net \| Customer Concentration Risk \| Customer 3
Revenue, Major Customer [Line Items]
Revenue	4,335	0	0
Sales Revenue, Net \| Customer Concentration Risk \| Customer 4
Revenue, Major Customer [Line Items]
Revenue	2,848	2,592	1,385
Sales Revenue, Net \| Customer Concentration Risk \| Customer 5
Revenue, Major Customer [Line Items]
Revenue	866	8,778	0
Sales Revenue, Net \| Customer Concentration Risk \| Customer 6
Revenue, Major Customer [Line Items]
Revenue	0	445	1,571
Sales Revenue, Net \| United States \| Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue	34,514	9,473	1,721
Sales Revenue, Net \| ESTONIA \| Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue	2,848	2,592	1,385
Sales Revenue, Net \| Other \| Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue	566	450	$ 78
Accounts Receivable Benchmark \| Customer Concentration Risk \| Customer 1
Revenue, Major Customer [Line Items]
Accounts Receivable, after Allowance for Credit Loss	291	0
Accounts Receivable Benchmark \| United States \| Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Accounts Receivable, after Allowance for Credit Loss	115	92
Accounts Receivable Benchmark \| ESTONIA \| Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Accounts Receivable, after Allowance for Credit Loss	$ 291	$ 0

SUPPLEMENTAL FINANCIAL INFORM_4

SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Unrealized gain (loss) on investments	$ 15,472
Realized loss on investments	(10,491)	$ 0	$ 0
Unrealized gain (loss) on marketable securities	(530)	(456)	795
Realized gain on marketable securities	1,141	0	0
Realized gain on convertible note redemptions and sale	1,430	0	0
Change in value of warrant liabilities	0	0	(8,078)
Foreign exchange gain (loss)	423	2,058	(128)
Department of Energy awards	0	0	1,900
Interest income, net and other	5,697	(166)	340
Other income (loss)	$ 13,142	$ (15,372)	$ 1,140

SUPPLEMENTAL FINANCIAL INFORM_5

SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable	$ 1,006	$ 1,850
Accrued operating expenses	4,391	1,783
Accrued payroll liabilities	4,162	2,929
Accrued capital expenditures	205	22
Accrued taxes	393	240
Other accrued liabilities	4	105
Total accounts payable and accrued liabilities	$ 10,161	$ 6,929

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Asset retirement obligation	$ 10,922	$ 9,595	$ 13,687
Canyon Project
Other Commitments [Line Items]
Loss contingency, estimate of possible loss	17,580	21,040
Asset retirement obligation	$ 33,380	$ 42,910

FAIR VALUE ACCOUNTING - Narrati

FAIR VALUE ACCOUNTING - Narrative (Details) $ in Thousands	Nov. 29, 2023 USD ($)	Nov. 09, 2023 USD ($)	Feb. 14, 2023 percentagepoint
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible Notes Receivable, Sold		$ 20,000
Convertible Note Receivable, Consideration Received		21,000
Convertible Note Receivable, Unpaid Accrued Interest		1,500
Convertible Note Receivable, Sales Commission	$ 100
Proceeds From Convertible Note Receivable		22,400
Convertible Note Receivable, Redeemed		$ 40,000
Measurement Input, Price Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Receivable, Fair Value Measurement Input \| percentagepoint			0.60
Measurement Input, Yield
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Receivable, Fair Value Measurement Input \| percentagepoint			0.095

FAIR VALUE ACCOUNTING - Fair Va

FAIR VALUE ACCOUNTING - Fair Value Measurements, Recurring and Nonrecurring (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents(1)	$ 40,512	$ 30,336
Investments accounted for at fair value		19,329
Marketable equity securities	25,578	1,067
Marketable debt securities	107,466	11,125
Fair Value, Net Asset (Liability)	173,556	61,857
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents(1)	0	0
Investments accounted for at fair value		19,263
Marketable equity securities	25,554	1,033
Marketable debt securities	0	0
Fair Value, Net Asset (Liability)	25,554	20,296
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents(1)	40,512	30,336
Investments accounted for at fair value		66
Marketable equity securities	24	34
Marketable debt securities	107,466	11,125
Fair Value, Net Asset (Liability)	148,002	41,561
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents(1)	0	0
Investments accounted for at fair value		0
Marketable equity securities	0	0
Marketable debt securities	0	0
Fair Value, Net Asset (Liability)	$ 0	$ 0

FAIR VALUE ACCOUNTING - Measure

FAIR VALUE ACCOUNTING - Measured on Recurring Basis (Details) $ in Thousands	11 Months Ended
	Dec. 31, 2023 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal redeemed and sale	$ (60,887)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (loss) (Note 13)
Realized gain included in other income (loss)	$ 1,430
Notes Receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance, February 14, 2023	59,457
Ending balance, December 31, 2023	$ 0

RELATED PARTY TRANSACTIONS (Det

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Revenues	$ 37,928	$ 12,515	$ 3,184
Accounts Receivable, after Allowance for Credit Loss	406	92
Cash received from non-controlling interest	83	126	$ 311
Other long-term receivables	$ 1,534	1,537
Director \| Arkose Mining Venture
Related Party Transaction [Line Items]
Equity method, ownership percentage	81%
Director \| United Nuclear \| Arkose Mining Venture
Related Party Transaction [Line Items]
Equity method, ownership percentage	19%
CUR
Related Party Transaction [Line Items]
Revenues	$ 570	450
Accounts Receivable, after Allowance for Credit Loss	$ 50	$ 80

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, $ in Thousands		2 Months Ended	12 Months Ended
	Jan. 25, 2024	Feb. 23, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Exercise price (in USD per share)			$ 2.83	$ 2.93	$ 2.95
Shares issued (in shares)			162,659,155	157,682,531	156,262,199	134,311,033
Subsequent Event
Subsequent Event [Line Items]
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options And Non Equity Instruments, Exercises in Period, Weighted Average Exercise Price	$ 8.23
Subsequent Event \| At The Market Sale Of Stock
Subsequent Event [Line Items]
Shares issued (in shares)		620,000
Proceeds from Issuance of Common Stock		$ 4,790
Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Award vesting period			3 years
Restricted Stock Units (RSUs) \| Subsequent Event
Subsequent Event [Line Items]
Shares granted in share-based compensation awards (in shares)	2,780,000
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options And Non Equity Instruments, Exercises in Period, Weighted Average Exercise Price	$ 7.48
Restricted Stock Units (RSUs) \| Share-based Compensation Award, Tranche Four \| Subsequent Event
Subsequent Event [Line Items]
Award vesting rights, percentage	50%
Restricted Stock Units (RSUs) \| Share-based Compensation Award, Tranche Five \| Subsequent Event
Subsequent Event [Line Items]
Award vesting rights, percentage	25%
Restricted Stock Units (RSUs) \| Share-based Compensation Award, Tranche Six \| Subsequent Event
Subsequent Event [Line Items]
Award vesting rights, percentage	25%
Non-Incentive Stock Options \| Subsequent Event \| Transaction One
Subsequent Event [Line Items]
Stock options granted in period (in shares)	680,000
Exercise price (in USD per share)	$ 7.48
Non-Incentive Stock Options \| Subsequent Event \| Transaction Two
Subsequent Event [Line Items]
Stock appreciation rights, grants (in shares)	970,000
Employee Stock Option
Subsequent Event [Line Items]
Award vesting period			2 years
Employee Stock Option \| Subsequent Event
Subsequent Event [Line Items]
Award vesting period	5 years
Employee Stock Option \| Share-based Compensation Award, Tranche Two \| Subsequent Event
Subsequent Event [Line Items]
Award vesting rights, percentage	50%
Employee Stock Option \| Share-based Compensation Award, Tranche Three \| Subsequent Event
Subsequent Event [Line Items]
Award vesting rights, percentage	50%
Non-Incentive Stock Options, Consultant Options \| Subsequent Event
Subsequent Event [Line Items]
Stock options granted in period (in shares)	310,000
Award vesting period	3 years
Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options And Non Equity Instruments, Exercises in Period, Weighted Average Exercise Price	$ 7.48
Non-Incentive Stock Options, Consultant Options \| Share-based Compensation Award, Tranche One \| Subsequent Event
Subsequent Event [Line Items]
Award vesting rights, percentage	50%
Non-Incentive Stock Options, Consultant Options \| Share-based Compensation Award, Tranche Two \| Subsequent Event
Subsequent Event [Line Items]
Award vesting rights, percentage	50%