NexGen Energy (NXE) 40-F24 Feb 232022 FY Annual report (Canada)Financial data

Company Profile

Cover

Cover	12 Months Ended
Cover	Dec. 31, 2022 shares
Document Information [Line Items]
Document Type	40-F
Amendment Flag	false
Entity Interactive Data Current	Yes
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Trading Symbol	NXE
Entity Registrant Name	NexGen Energy Ltd
Entity Central Index Key	0001698535
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Address, Country	CA
Entity Incorporation, State or Country Code	A1
Entity Common Stock, Shares Outstanding	482,530,145
Title of 12(b) Security	Common Shares
Security Exchange Name	NYSE
Entity Address, Address Line One	Suite 3150, 1021 West Hastings Street
Entity Address, City or Town	Vancouver, B.C.
Entity Address, Postal Zip Code	V6E 0C3
City Area Code	604
Local Phone Number	428-4112
Document Registration Statement	false
Document Annual Report	true
Entity File Number	001-38072
ICFR Auditor Attestation Flag	true
Entity Primary SIC Number	1090
Annual Information Form	true
Audited Annual Financial Statements	true
Auditor Name	KPMG LLP
Auditor Firm ID	85
Auditor Location	Vancouver, Canada
Business Contact [Member]
Document Information [Line Items]
Contact Personnel Name	Puglisi & Associates
Entity Address, Address Line One	850 Library Avenue
Entity Address, Address Line Two	Suite 204
Entity Address, City or Town	Newark
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19711
City Area Code	302
Local Phone Number	738-6680

Consolidated Statements of Fina

Consolidated Statements of Financial Position - CAD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current Assets
Cash	$ 134,447	$ 201,804
Marketable securities (Note 5)	5,775	9,315
Amounts receivable	1,801	1,178
Prepaid expenses and other assets	2,165	1,028
Total Current Assets	144,188	213,325
Non-Current Assets
Exploration and evaluation assets (Note 6)	405,248	326,543
Property and equipment (Note 7)	5,048	6,619
Deposits	76	76
Total assets	554,560	546,563
Current Liabilities
Accounts payable and accrued liabilities	13,723	7,499
Lease liabilities (Note 10)	775	706
Flow-through share premium liability (Note 8)	2,069	0
Total Current Liabilities	16,567	8,205
Non-current Liabilities
Convertible debentures (Note 9)	80,021	72,011
Long-term lease liabilities (Note 10)	1,688	2,463
Deferred income tax liabilities (Note 17)	867	2,536
Total liabilities	99,143	85,215
Equity
Share capital (Note 11)	712,603	695,856
Reserves (Note 11)	94,680	68,837
Accumulated other comprehensive income	460	1,895
Accumulated deficit	(389,867)	(332,980)
Equity attributable to NexGen Energy Ltd. shareholders	417,876	433,608
Non-controlling interests (Note 16)	37,541	27,740
Total equity	455,417	461,348
Total liabilities and equity	$ 554,560	$ 546,563

Consolidated Statements of Net

Consolidated Statements of Net Loss and Comprehensive Loss $ in Thousands	12 Months Ended
	Dec. 31, 2022 CAD ($) shares	Dec. 31, 2022 $ / shares	Dec. 31, 2021 CAD ($) shares	Dec. 31, 2021 $ / shares
Profit or loss [abstract]
Salaries, benefits and directors' fees	$ 9,306		$ 10,352
Office, administrative, and travel	7,853		3,325
Professional fees and insurance	5,661		3,983
Depreciation (Note 7)	1,814		2,126
Share-based payments (Note 11)	35,146		31,389
Total value	59,780		51,175
Finance income	(2,787)		(910)
Mark-to-market loss on convertible debentures (Note 9)	2,863		75,123
Interest expense on convertible debentures (Note 9)	2,179		3,729
Interest on lease liabilities (Note 10)	207		265
Loss (gain) on sale of assets (Note 5, 6)	85		(3,595)
Foreign exchange (gain) loss	(1,017)		68
Other income	0		(29)
Loss before taxes	61,310		125,826
Deferred income tax (recovery) expense (Note 17)	(1,042)		1,122
Net loss	60,268		126,948
Items that may not be reclassified subsequently to profit or loss:
Change in fair value of convertible debentures attributable to the change in credit risk (Note 9)	(149)		336
Change in fair value of marketable securities (Note 5)	3,540		(5,772)
Deferred income tax expense (recovery) (Note 17)	(461)		701
Net comprehensive loss	63,198		122,213
Net loss attributable to:
Shareholders of NexGen Energy Ltd.	56,587		119,087
Non-controlling interests	3,681		7,861
Net loss	60,268		126,948
Net comprehensive loss attributable to:
Shareholders of NexGen Energy Ltd.	58,022		116,869
Non-controlling interests	5,176		5,344
Net comprehensive loss	$ 63,198		$ 122,213
Loss per share attributable to NexGen Energy Ltd. shareholders
Basic and diluted loss per share \| $ / shares		$ 0.12		$ 0.26
Weighted average common shares outstanding
Basic and diluted \| shares	479,680,438		459,287,424

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from (used in) from operating activities
Net loss for the year:	$ (60,268)	$ (126,948)
Adjust for:
Depreciation (Note 7)	1,814	2,126
Share-based payments (Note 11)	35,146	31,389
Mark-to-market loss on convertible debenture (Note 9)	2,863	75,123
Interest expense on convertible debentures (Note 9)	2,179	3,729
Interest on lease liabilities (Note 10)	207	265
Deferred income tax (recovery) expense (Note 17)	(1,042)	1,122
Unrealized foreign exchange (gain) loss	(1,017)	68
Loss (gain) on sale of assets (Note 5, 6)	85	(3,595)
Other non-cash items	0	(16)
Operating cash flows before working capital	(20,033)	(16,737)
Changes in working capital items:
Amounts receivable	(623)	(873)
Prepaid expenses and other	(1,137)	(329)
Accounts payable and accrued liabilities	1,617	1,151
Cash used in operating activities	(20,176)	(16,788)
Cash flows used in investing activities
Expenditures on exploration and evaluation assets (Note 6)	(67,699)	(45,733)
Proceeds on sale of assets	0	192
Acquisition of equipment, net of disposals	(354)	(1,181)
Deposits	0	9
Cash used in investing activities	(68,053)	(46,713)
Cash flows from (used in) financing activities
Proceeds from bought-deal financing, net of share issuance costs (Note 11)	0	163,290
Proceeds from common share issuance on ASX, net of share issuance costs (Note 11)	0	1,039
Shares issued from IsoEnergy Ltd. for cash from private placements, net of share issuance costs	6,244	0
Issuance of convertible debentures from IsoEnergy Ltd., net of issue costs (Note 9)	5,296	0
Proceeds from exercise of options and warrants (Note 11)	10,717	30,988
Payment of lease liabilities (Note 10)	(913)	(1,003)
Interest paid on convertible debentures (Note 9)	(1,489)	(2,963)
Cash provided by financing activities	19,855	191,351
Foreign exchange gain (loss) on cash	1,017	(68)
(Decrease) increase in cash	(67,357)	127,782
Cash, beginning of year	201,804	74,022
Cash, end of year	$ 134,447	$ 201,804

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - CAD ($) $ in Thousands	Total	Share Capital [member]	Reserves [member]	Accumulated Other Comprehensive Income (loss)	Retained earnings [member]	Attributable to shareholder's of NexGen Energy Ltd [member]	Non-controlling Interests [member]
Beginning balance at Dec. 31, 2020	$ 119,252	$ 255,953	$ 54,939	$ (4,339)	$ (212,302)	$ 94,251	$ 25,001
Beginning balance, shares at Dec. 31, 2020		381,830,205
Statement [LineItems]
Shares issued on exercise of stock options (Note 11)	25,962	$ 43,084	(17,122)			25,962
Shares issued on exercise of stock options (Note 11) shares		10,020,001
Shares issued for convertible debenture interest payments	1,289	$ 1,289				1,289
Shares issued for convertible debenture interest payments, shares		254,692
Share-based payments	36,646		31,346			31,346	5,300
Ownership changes relating to non-controlling interests	5,208				2,425	2,425	2,783
Net loss for the period	(126,948)				(119,087)	(119,087)	(7,861)
Other comprehensive loss	4,735			2,218		2,218	2,517
Shares issued on converted debentures (Note 9)	230,301	$ 230,301				230,301
Shares issued on converted debentures (Note 9), shares		48,083,335
Shares issued on bought-deal financing, net of share issue costs (Note 11)	163,290	$ 163,290				163,290
Shares issued on bought-deal financing, net of share issue costs (Note 11), shares		38,410,000
Shares issued on ASX, net of share issue costs (Note 11)	1,039	$ 1,039				1,039
Shares issued on ASX, net of share issue costs (Note 11), shares		400,000
Shares issued for the Rook 1 property development (Note 11)	574	$ 900	(326)			574
Shares issued for the Rook 1 property development (Note 11), shares		200,000
Reclass accumulated other comprehensive income related to converted debentures (Note 8)				4,016	(4,016)
Ending balance at Dec. 31, 2021	461,348	$ 695,856	68,837	1,895	(332,980)	433,608	27,740
Ending balance, shares at Dec. 31, 2021		479,198,233
Statement [LineItems]
Shares issued on exercise of stock options (Note 11)	$ 10,001	$ 16,261	(6,260)			10,001
Shares issued on exercise of stock options (Note 11) shares	3,247,332	3,247,332
Shares issued for convertible debenture interest payments	$ 486	$ 486				486
Shares issued for convertible debenture interest payments, shares		84,580
Share-based payments	41,510		32,103			32,103	9,407
Ownership changes relating to non-controlling interests	5,270				(300)	(300)	5,570
Net loss for the period	(60,268)				(56,587)	(56,587)	(3,681)
Other comprehensive loss	(2,930)			(1,435)		(1,435)	(1,495)
Ending balance at Dec. 31, 2022	$ 455,417	$ 712,603	$ 94,680	$ 460	$ (389,867)	$ 417,876	$ 37,541
Ending balance, shares at Dec. 31, 2022		482,530,145

REPORTING ENTITY

REPORTING ENTITY	12 Months Ended
REPORTING ENTITY	Dec. 31, 2022
Text block [abstract]
REPORTING ENTITY	1. REPORTING ENTITY NexGen Energy Ltd. (“NexGen” or the “Company”) is a development stage entity engaged in the acquisition, exploration and evaluation and development of uranium properties in Canada. The Company was incorporated pursuant to the provisions of the British Columbia Business Corporations Act on March 8, 2011. The Company’s registered records office is located on the 25th Floor, 700 West Georgia Street, Vancouver, B.C., V7Y 1B3. The Company is listed on the Toronto Stock Exchange (the “ TSX “ASX” up-listed NYSE American NYSE In February 2016, the Company incorporated four wholly owned subsidiaries: NXE Energy Royalty Ltd., NXE Energy SW1 Ltd., NXE Energy SW3 Ltd., and IsoEnergy Ltd. (collectively, the “Subsidiaries”). The Subsidiaries were incorporated to hold certain exploration assets of the Company. In 2016, certain exploration and evaluation assets were transferred to each of IsoEnergy Ltd. (“IsoEnergy”), NXE Energy SW1 Ltd. and NXE Energy SW3 Ltd. Subsequent to the transfer, IsoEnergy shares were listed on the TSX-V.

NATURE OF OPERATIONS

NATURE OF OPERATIONS	12 Months Ended
NATURE OF OPERATIONS	Dec. 31, 2022
Text block [abstract]
NATURE OF OPERATIONS	2. NATURE OF OPERATIONS As a development stage company, NexGen does not have revenues and historically has recurring operating losses. As at December 31, 2022, the Company had an accumulated deficit of $ and working capital of $ . The Company will be required to obtain additional funding in order to continue with the exploration and development of its mineral properties. The business of exploring for minerals and development of projects involves a high degree of risk. NexGen is an exploration and development company and is subject to risks and challenges similar to companies in a comparable stage. These risks include, but are not limited to, the challenges of securing adequate capital; development and operational risks inherent in the mining industry; changes in government policies and regulations; the ability to obtain the necessary environmental permits or, alternatively NexGen’s ability to dispose of its exploration and evaluation assets on an advantageous basis; as well as global economic and uranium price volatility; all of which are uncertain. The underlying value of the exploration and evaluation assets is dependent upon the existence and economic recovery of mineral reserves and is subject to, but not limited to, the risks and challenges identified above. Changes in future conditions could require material write-downs of the carrying value of exploration and evaluation assets.

BASIS OF PREPARATION

BASIS OF PREPARATION	12 Months Ended
BASIS OF PREPARATION	Dec. 31, 2022
Text block [abstract]
BASIS OF PREPARATION	3. BASIS OF PREPARATION Statement of Compliance These consolidated financial statements for the year ended December 31, 2022, including comparatives, have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”) and interpretations of the International Financial Reporting Interpretations Committee (“IFRIC”). The consolidated financial statements were authorized for issue by the Board of Directors on February 23, 2023. Basis of Presentation These consolidated financial statements have been prepared on a historical cost basis, except for certain financial instruments which have been measured at fair value, including the convertible debentures issued by the Company and IsoEnergy (Note 9) and the marketable securities (Note 5). In addition, these consolidated financial statements have been prepared using the accrual basis of accounting, except for cash flow information. All monetary references expressed in these notes are references to Canadian dollar amounts (“$”), except as otherwise noted. These financial statements are presented in Canadian dollars, which is the functional currency of the Company and its subsidiaries. Critical accounting judgments, estimates and assumptions The preparation of the consolidated financial statements requires management to make judgments, estimates and assumptions that affect the reported amounts of assets, liabilities and contingent liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Estimates and assumptions are continuously evaluated and are based on management’s experience and other factors, including expectations of future events that are believed to be reasonable in the circumstances. Uncertainty about these judgments, estimates and assumptions could result in a material adjustment to the carrying amount of the asset or liability affected in future periods. Where the fair value of financial assets and financial liabilities recorded in the financial statements cannot be derived from active markets, their fair value is determined using valuation models. The inputs to these models are taken from observable markets where possible, but where this is not feasible, a degree of judgment is required in establishing fair values. The judgments include considerations of inputs such as liquidity risk, credit risk and volatility. Changes in assumptions about these factors could affect the reported fair value of financial instruments. The information about significant areas of estimation uncertainty considered by management in preparing the financial statements is as follows: (i) Impairment At the end of each financial reporting period the carrying amounts of the Company’s non-financial (ii) Share-based payments The Company uses the Black-Scholes option pricing model to determine the fair value of options and warrants in order to calculate share-based payments expense and the fair value of broker warrants. The Black-Scholes model involves six key inputs to determine fair value of an option: risk-free interest rate, exercise price, market price at date of issue, expected dividend yield, expected life, and expected volatility. Certain of the inputs are estimates that involve considerable judgment and are or could be affected by significant factors that are out of the Company’s control. The Company is also required to estimate the future forfeiture rate of options based on historical information in its calculation of share-based payments expense. Refer to Note 11 for further details. (iii) Convertible debentures The Company uses a model based on a system of two coupled Black-Scholes equations to determine the fair value of the convertible debentures. This model involves five key inputs to determine the fair value of the convertible debentures: risk-free interest rate, credit spread, market price at valuation date, expected dividend yield and historical volatility. Certain inputs are estimates that involve considerable judgment and are, or could be, affected by significant factors that are out of the Company’s control. Refer to Note 9 for further details. The information about significant areas of judgment considered by management in preparing the financial statements is as follows: (i) Deferred tax assets Deferred tax assets are recognized in respect of tax losses and other temporary differences to the extent it is probable that taxable income will be available against which the losses can be utilized. Judgment is required to determine the amount of deferred tax assets that can be recognized based upon the likely timing and level of future taxable income together with future tax planning strategies. Refer to Note 17 for further details. (ii) Exploration and evaluation assets The application of the Company’s accounting policy for exploration and evaluation expenditures requires judgment to determine whether future economic benefits are likely, from either future exploitation or sale, or whether activities have reached a stage which permits a reasonable assessment of the existence of reserves. The determination of reserves and resources is itself an estimation process that requires varying degrees of uncertainty depending on how the resources are classified.

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SIGNIFICANT ACCOUNTING POLICIES	Dec. 31, 2022
Text block [abstract]
SIGNIFICANT ACCOUNTING POLICIES	4. SIGNIFICANT ACCOUNTING POLICIES The significant accounting policies set out below have been applied consistently to all years presented in these financial statements: (a) Functional and presentation currency These financial statements are presented in Canadian dollars, which is the functional currency of the Company and its subsidiaries. Translation of transactions and balances Foreign currency transactions are translated into the functional currency using the exchange rates prevailing at the dates of the transactions or valuation where items are re-measured. Non-monetary (b) Consolidation These consolidated financial statements include the accounts of the Company and its subsidiaries: NXE Energy Royalty Ltd., NXE Energy SW1 Ltd., NXE Energy SW3 Ltd. and IsoEnergy. Shares of IsoEnergy were issued to third parties as part of financings since its inception, thereby resulting in the recognition of non-controlling interests. The financial results of the subsidiaries are included in these consolidated financial statements from the date of incorporation. Intercompany balances and transactions are eliminated on consolidation. Name of Subsidiary Percentage Ownership as at December 31, 2022 Percentage Ownership as at December 31, 2021 NXE Energy Royalty Ltd. 100% 100% NXE Energy SW1 Ltd. 100% 100% NXE Energy SW3 Ltd. 100% 100% IsoEnergy Ltd. 50.1% 50.5% (c) Cash Cash includes deposits held with banks that are available on demand. (d) Exploration and evaluation assets Once the legal rights to explore a property have been obtained, exploration and evaluation costs are capitalized as exploration and evaluation assets on an area of interest basis pending determination of the technical feasibility and the commercial viability of the project. Capitalized costs include costs directly related to exploration and evaluation activities in the area of interest. When a claim is relinquished or a project is abandoned, the related costs are recognized in the statement of net loss and comprehensive loss immediately. Proceeds received from the sale of any interest in a property will be credited against the carrying value of the property, with any excess included in operations for the period. If a property is abandoned, the acquisition and deferred exploration costs will be written off to operations. Although the Company has taken steps to verify title to exploration and evaluation assets in which it has an interest, in accordance with industry standards for the current stage of exploration of such properties, these procedures do not guarantee the Company’s title. A property may be subject to unregistered prior agreements or inadvertent non-compliance Management regularly assesses exploration and evaluation assets for events or circumstances that may indicate possible impairment. Once the technical feasibility and commercial viability of the extraction of mineral resources in an area of interest are demonstrable, exploration and evaluation assets attributable to that area of interest are first tested for impairment and then reclassified to mining assets and development assets within property, plant and equipment. (e) Equipment (i) Recognition and measurement Items of equipment are stated at cost less accumulated depreciation and impairment losses. Cost includes expenditures that are directly attributable to the acquisition of the asset. (ii) Subsequent costs The cost of replacing a part of an item in the carrying amount of equipment is recognized when that cost is incurred, if it is probable that the future economic benefits embodied within the item will flow to the Company and the cost of the item can be measured reliably. (iii) Depreciation The carrying amounts of equipment (including initial and subsequent capital expenditures) are amortized to their estimated residual value over the estimated useful lives of the specific assets concerned. Depreciation is calculated over the estimated useful lives of each significant component as follows: - Computing equipment 55% declining balance basis - Software 55% declining balance basis - Field equipment 20% declining balance basis - Leasehold improvements Lease term straight-line basis - Road 5-year - Lease right-of-use Lease term straight-line basis - Vehicles 2-year Depreciation methods, useful lives, and residual values are reviewed at least annually and adjusted if appropriate. (iv) Disposal Gains and losses on disposal of an item of equipment are determined by comparing the proceeds from disposal with the carrying amount of the item of equipment and are recognized in the statement of net loss and comprehensive loss. (f) Leases At inception of a contract, the Company assesses whether a contract is, or contains, a lease. A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. To assess whether a contract conveys the right to control the use of an identified asset, the Company assesses whether: ● The contract involves the use of an identified asset. This may be specific, explicitly or implicitly, and should be physically distinct or represent substantially all of the capacity of a physically distinct asset. If the supplier has a substantive substitution right, then the asset is not identified; ● The Company has the right to obtain substantially all of the economic benefit from use of the asset throughout the period of use; and ● The Company has the right to direct the use of the asset. The Company has this right when it has the decision-making rights that are most relevant to changing how and for what purpose the asset is used. The Company recognizes a right-of-use right-of-use The right-of-use right-of-use right-of-use right-of-use The lease liability is initially measured at the present value of the lease payments that are not paid at the commencement date, discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, the Company’s incremental borrowing rate. Generally, the Company uses its incremental borrowing rate as the discount rate. The lease liability is measured at amortized cost using the effective interest method. It is remeasured when there is a change in future lease payments arising from a change in index or rate, if there is a change in the Company’s estimate of the amount expected to be payable under a residual value guarantee, or if the Company changes its assessment of whether it will exercise a purchase, extension or termination option. When the lease liability is remeasured in this way, a corresponding adjustment is made to the carrying amount of the right-of-use right-of-use The Company has elected to apply the recognition exemption not to recognize right-of-use low-value (g) Impairment An impairment loss is recognized when the carrying amount of an asset, or its cash generating unit (“CGU”), exceeds its recoverable amount. A CGU is the smallest identifiable group of assets that generates cash inflows that are largely independent of the cash inflows from other assets or groups of assets. Impairment losses are recognized in profit and loss for the period. Impairment losses recognized in respect of CGUs are allocated first to reduce the carrying amount of any goodwill allocated to CGUs and then to reduce the carrying amount of the other assets in the unit on a pro-rata The recoverable amount of assets is the greater of an asset’s fair value less cost to sell and value in use. In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax An impairment loss is only reversed if there is an indication that the impairment loss may no longer exist and there has been a change in the estimates used to determine the recoverable amount, however, not to an amount higher than the carrying amount that would have been determined had no impairment loss been recognized in previous years. (h) Decommissioning and restoration provisions Decommissioning and restoration provisions are recorded when a present legal or constructive obligation exists as a result of past events where it is probable that an outflow of resources embodying economic benefits will be required to settle the obligation, and a reliable estimate of the amount of the obligation can be made. The amount recognized as a provision is the best estimate of the consideration required to settle the present obligation at the reporting date, taking into account the risks and uncertainties surrounding the obligation and discount rates. Where a provision is measured using the cash flows estimated to settle the present obligation, its carrying amount is the present value of those cash flows discounted at the market discount rate. Over time the carrying value of the liability is increased for the changes in the present value based on the current market discount rates and liability risks. When some or all of the economic benefits required to settle a provision are expected to be recovered from a third party, the receivable is recognized as an asset if it is virtually certain that reimbursement will be received, and the amount receivable can be measured reliably. Changes in reclamation estimates are accounted for prospectively as a change in the corresponding capitalized cost. The Company did not have any decommissioning and restoration provisions for the years presented. (i) Share capital Common shares are classified as equity. Incremental costs directly attributable to the issue of common shares are recognized as a deduction from equity. Common shares issued for consideration other than cash, are valued based on their market value at the date the shares are issued. The Company has adopted a residual value method with respect to the measurement of shares and warrants issued as private placement units. The residual value method first allocates value to the more easily measurable component based on fair value and then the residual value, if any, to the less easily measurable component. The Company considers the fair value of common shares issued in the private placements to be the more easily measurable component and the common shares are valued at their fair value, as determined by the closing market price on the announcement date. The balance, if any, is allocated to the attached warrants. Any fair value attributed to the warrants is recorded as reserves. (j) Share-based payments The Company’s stock option plan allows Company employees, directors, officers and consultants to acquire shares of the Company. The fair value of options granted is recognized as share-based payments expense with a corresponding increase in equity reserves. The fair value of the options granted is measured using the Black-Scholes option pricing model, taking into account the terms and conditions upon which the options were granted. Fair value is measured at grant date, and each tranche is recognized using the graded vesting method over the period during which the options vest. At each financial reporting date, the amount recognized as an expense is adjusted to reflect the actual number of stock options that are expected to vest. In situations where equity instruments are issued to non-employees non-employees (k) Flow-through shares Resource expenditure deductions for income tax purposes related to exploration activities funded by flow-through share arrangements are renounced to investors under Canadian income tax legislation. On issuance, the Company separates the flow-through share into i) a flow-through share premium, equal to the estimated premium, if any, investors paid for the flow-through feature, which is recognized as a liability due to the obligation to incur eligible expenditures and ii) share capital. Upon eligible exploration expenditures being incurred, the Company recognizes a deferred tax liability for the amount of tax deduction renounced to shareholders. To the extent that eligible deferred income tax assets are available, the Company will reduce the deferred income tax liability and records a deferred income tax recovery. Proceeds received from the issuance of flow-through shares must be expended on Canadian resource property exploration within a period of . Failure to expend such funds as required under the Canadian income tax legislation will result in a Part XII. tax to the Company on flow-through proceeds renounced under the “Look-back” Rule. If applicable, this tax is classified as an administration expense. (l) Loss per share Basic loss per share is calculated by dividing the loss attributable to the Company’s common shareholders for the year by the weighted average number of common shares outstanding during the year. The Company uses the treasury stock method to compute the dilutive effect of options, warrants and other similar instruments. Under this method, the weighted average number of shares outstanding used in the calculation of diluted loss per share assumes that the deemed proceeds received from the exercise of stock options, share purchase warrants and their equivalents would be used to repurchase common shares of the Company at the average market price during the period. Shares to be issued on existing stock options, warrants and convertible debentures have not been included in the computation of diluted loss per share as to do so would be anti-dilutive. Accordingly, basic and diluted loss per share is the same for the years presented. (m) Income taxes Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in the statement of net loss except to the extent that it relates to items recognized directly in equity or in other comprehensive income. Current tax is the expected tax payable or receivable on the taxable income or loss for the year, using tax rates enacted at the reporting date, and any adjustment to tax payable in respect of previous years. Deferred tax is recognized in respect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. Deferred tax is not recognized for the following temporary differences: the initial recognition of assets or liabilities in a transaction that is not a business combination and that affects neither accounting nor taxable profit or loss, and differences relating to investments in subsidiaries and jointly controlled entities to the extent that it is probable that they will not reverse in the foreseeable future. In addition, deferred tax is not recognized for taxable temporary differences arising on the initial recognition of goodwill. Deferred tax is measured at the tax rates that are expected to be applied to temporary differences when they reverse, based on the laws that have been enacted or substantively enacted by the reporting date. Deferred tax assets and liabilities are offset if there is a legally enforceable right to offset current tax liabilities and assets, and they relate to income taxes levied by the same tax authority on the same taxable entity, or on different tax entities, but they intend to settle current tax liabilities and assets on a net basis or their tax assets and liabilities will be realized simultaneously. A deferred tax asset is recognized for unused tax losses, tax credits and deductible temporary differences, to the extent that it is probable that future taxable profits will be available against which they can be utilized. Future taxable profits are determined based on the reversal of relevant taxable temporary differences. If the amount of taxable temporary differences is insufficient to recognize a deferred tax asset in full, then future taxable profits, adjusted for reversals of existing temporary differences, are considered, based on the business plan for the Company. Deferred tax assets are reviewed at each reporting date and are reduced to the extent that it is no longer probable that the related tax benefit will be realized. (n) Financial instruments (i) Classification The Company classifies its financial assets in the following categories: at fair value through profit or loss (“FVTPL”), at fair value through other comprehensive income (“FVTOCI”) or at amortized cost. The Company determines the classification of financial assets at initial recognition. The classification of debt instruments is driven by the Company’s business model for managing the financial assets and their contractual cash flow characteristics. Equity instruments that are held for trading (including all equity derivative instruments) are classified as FVTPL. For other equity instruments, on the day of acquisition the Company can make an irrevocable election (on an instrument-by-instrument The Company has the following financial instruments, which are classified under IFRS 9 in the table below: Financial assets/liabilities Classification Cash Amortized cost Amounts receivable Amortized cost Marketable securities FVTOCI Accounts payable and accrued liabilities Amortized cost Convertible debentures FVTPL (ii) Measurement Financial assets at FVTOCI Elected investments in equity instruments at FVTOCI are initially recognized at fair value plus transaction costs. Subsequently they are measured at fair value, with gains and losses arising from changes in fair value recognized in other comprehensive loss. The Company’s Marketable Securities have been recognized at FVTOCI (Note 5). Financial assets and liabilities at amortized cost Financial assets and liabilities at amortized cost are initially recognized at fair value, and subsequently carried at amortized cost less any impairment. Financial assets and liabilities at FVTPL Financial assets and liabilities carried at FVTPL are initially recorded at fair value and transaction costs are expensed in the consolidated statements of net loss. Realized and unrealized gains and losses arising from changes in the fair value of the financial assets and liabilities held at FVTPL are included in the consolidated statements of net loss in the period in which they arise. Where management has opted to recognize a financial liability at FVTPL, any changes associated with the Company’s own credit risk will be recognized in other comprehensive loss. The convertible debentures have been recognized at FVTPL (Note 9). (iii) Impairment of financial assets at amortized cost Under IFRS 9, the Company recognizes a loss allowance using the expected credit loss model on financial assets that are measured at amortized cost. At each reporting date, the Company measures the loss allowance for the financial asset at an amount equal to the lifetime expected credit losses if the credit risk on the financial asset has increased significantly since initial recognition. If at the reporting date, the financial asset has not increased significantly since initial recognition, the Company measures the loss allowance for the financial asset at an amount equal to twelve month expected credit losses. Impairment losses on financial assets carried at amortized cost are reversed in subsequent periods if the amount of the loss decreases and the decrease can be objectively related to an event occurring after the impairment was recognized. (iv) Derecognition Financial assets The Company derecognizes financial assets only when the contractual rights to cash flows from the financial assets expire, or when it transfers the financial assets and substantially all the associated risks and rewards of ownership to another entity. Gains and losses on derecognition are generally recognized in the consolidated statements of net loss. However, gains and losses on derecognition of financial assets classified as FVTOCI remain within the accumulated other comprehensive loss. Financial liabilities The Company derecognizes financial liabilities only when its obligations under the financial liabilities are discharged, cancelled or expired. The difference between the carrying amount of the financial liability derecognized and the consideration paid and payable, including any non-cash (o) Future accounting pronouncements The following standard has not been adopted by the Company and is being evaluated: Amendments to IAS 1 related to the Classification of Liabilities as Current or Non-Current, non-current, When a liability includes a counterparty conversion option that involves a transfer of the company’s own equity instruments, the conversion option is recognised as either equity or a liability separately from the host liability under IAS 32 Financial Instruments: Presentation. The IASB has now clarified that when a company classifies the host liability as current or non-current, non-current.

MARKETABLE SECURITIES

MARKETABLE SECURITIES	12 Months Ended
MARKETABLE SECURITIES	Dec. 31, 2022
Text block [abstract]
MARKETABLE SECURITIES	5. MARKETABLE SECURITIES a) Clover, Gemini, and Tower uranium properties sale In April 2021, the Company’s subsidiary, IsoEnergy, sold its interest in the Clover, Gemini and Tower uranium properties (“Properties”). IsoEnergy received cash of AUD $ ($ ) and common shares of 92 Energy Pty Ltd. (“92 Energy”) at a price of $ Australian Dollars (“AUD”) for a total value of AUD $ ($ ). In addition, IsoEnergy will retain a % Net Smelter Return (“NSR”) on the Properties. The Properties had a book value of $ , which resulted in a gain of $ in 2021. Disposition of Properties Marketable securities received $ 2,068 Cash 192 Proceeds – disposition of properties 2,260 Cost – disposition of properties (35) Gain on sale of assets $ 2,225 b) Mountain Lake Option Agreement In August 2021, IsoEnergy completed an option agreement (the “Option Agreement”) with International Consolidated Uranium Inc. (which subsequently changed its name to Consolidated Uranium Inc. (“CUR”)) to grant CUR the option to acquire a 100% interest in IsoEnergy’s Mountain Lake uranium property in Nunavut, Canada (the “Option”). Under the terms of the Option Agreement and as consideration, CUR issued common shares of CUR at a price of $ per share for a total value of $ , and paid cash of $ . The Option is exercisable, at CUR’s election, on or before the second anniversary of receipt of TSXV approval (August 3, 2023) for additional consideration of $ payable in cash or CUR shares. If the Option is exercised, IsoEnergy will be entitled to receive the following contingent payments in cash or CUR shares: ● If the uranium spot price reaches US$50 per pound, IsoEnergy will receive an additional $410 ● If the uranium spot price reaches US$75 per pound, IsoEnergy will receive an additional $615 ● If the uranium spot price reaches US$100 per pound, IsoEnergy will receive an additional $820 The spot price contingent payments will expire years following the date the Option is exercised. As at December 31, 2022, the Option has not been exercised by CUR. The Mountain Lake property had a book value of $126, which resulted in a gain of $1,370 in 2021. Disposition of Properties Marketable securities received $ 1,476 Cash 20 Proceeds – disposition of properties 1,496 Cost – disposition of properties (126) Gain on sale of assets $ 1,370 On February 22, 2022, CUR completed its spin-out pro-rata During the year ended December 31, 2022, the Company recognized a loss of $3,540 (December 31, 2021 – gain of $5,772) associated with the mark to market valuation of the 10,755,000 shares of 92 Energy, 900,000 shares of CUR and 193,300 shares of LUR, which is recorded in the consolidated statement of net loss and comprehensive loss. The fair value at December 31, 2022, of the marketable securities held in 92 Energy shares was $ (December 31, 2021 - $ ), CUR shares was $ (December 31, 2021 - $ ) and LUR shares was $ (December 31, 2021 - $ ), for a total marketable securities value at December 31, 2022, of $ (December 31, 2021 - $ ).

EXPLORATION AND EVALUATION ASSE

EXPLORATION AND EVALUATION ASSETS	12 Months Ended
EXPLORATION AND EVALUATION ASSETS	Dec. 31, 2022
Text block [abstract]
EXPLORATION AND EVALUATION ASSETS	6. EXPLORATION AND EVALUATION ASSETS (a) Rook I Project The Rook I Project is located in Northern Saskatchewan, approximately 40 kilometres (km) east of the Saskatchewan – Alberta border, approximately 150 km north of the town of La Loche and 640 km northwest of the City of Saskatoon and consists of contiguous mineral claims totaling hectares. The Rook I Project hosts the 100% owned Arrow deposit discovered by NexGen NexGen has a 100% interest in the claims subject only to: (i) a 2% net smelter return royalty (“NSR”); and (ii) a 10% production carried interest, in each case, only on claims S-113928 to S-113933, which are north, east, and outside of the Arrow deposit. (b) Other Athabasca Basin Properties The Other Athabasca Basin Properties are a portfolio of early-stage mineral properties in the Athabasca Basin. The properties are grouped geographically as “SW1”, “SW2” and “SW3”. The SW2 properties are held directly by NexGen. The SW1 and SW3 properties are held by NXE Energy SW1 Ltd. and NXE Energy SW3 Ltd., respectively, each a wholly owned subsidiary. (c) IsoEnergy Properties The IsoEnergy Properties consist of the following properties located in the Athabasca region of Saskatchewan: (i) a 100% interest in the Radio Project, Saskatchewan (subject to a 2% NSR and 2% gross overriding royalty on diamonds); (ii) a 100% interest in the Thorburn Lake Project (subject to a 1% NSR and a 10% carried interest which can be converted to a 1% NSR at the holder’s option upon completion of a bankable feasibility study); (iii) a 100% interest, in each of the Madison, 2Z, Carlson Creek and North Thorburn properties, Saskatchewan; (iv) a 100% interest in the Geiger property; (v) a 100% interest in the Larocque East property that constitutes 18,980 hectares and includes the Hurricane Zone; (vi) a 100% interest in the Evergreen Property that constitutes 35,362 hectares; and (vii) a portfolio of staked claims in Saskatchewan, all of which are early stage exploration properties. Rook I Other Athabasca IsoEnergy Total Acquisition cost Balance at December 31, 2021 $ 235 1,458 $ 26,660 28,353 Additions - - 10 10 Dispositions - - (42) (42) Balance as at December 31, 2022 $ 235 1,458 $ 26,628 28,321 Deferred exploration costs Balance at December 31, 2021 $ 260,941 9,180 $ 28,069 298,190 Additions: General exploration and drilling 7,705 - 5,613 13,318 Environmental, permitting, and engagement 12,005 - - 12,005 Technical, engineering and design 32,703 - - 32,703 Geochemistry and assays - - 190 190 Geological and geophysical 1,941 423 1,593 3,957 Labour and wages 8,818 - 836 9,654 Share-based payments (Note 11) 4,532 - 1,832 6,364 Travel 367 - 178 545 Total Additions 68,071 423 10,243 78,737 Balance as at December 31, 2022 $ 329,012 9,603 $ 38,312 376,927 Total costs, December 31, 2022 $ 329,247 11,061 $ 64,940 405,248 Rook I Other Athabasca IsoEnergy Total Acquisition cost Balance at December 31, 2020 $ 235 1,458 $ 26,778 28,471 Additions - - 27 27 Dispositions - - (145) (145) Balance as at December 31, 2021 $ 235 1,458 $ 26,660 28,353 Deferred exploration costs Balance at December 31, 2020 216,350 9,173 20,728 246,251 Additions: General exploration and drilling 6,502 - 3,615 10,117 Environmental, permitting, and engagement 15,154 - 2 15,156 Technical, engineering and design 13,893 - 1 13,894 Geochemistry and assays - - 333 333 Geological and geophysical 116 7 775 898 Labour and wages 4,925 - 815 5,740 Share-based payments (Note 11) 3,696 - 1,561 5,257 Travel 305 - 239 544 Total Additions 44,591 7 7,341 51,939 Balance as at December 31, 2021 $ 260,941 9,180 $ 28,069 298,190 Total costs, December 31, 2021 $ 261,176 10,638 $ 54,729 326,543

PROPERTY AND EQUIPMENT

PROPERTY AND EQUIPMENT	12 Months Ended
PROPERTY AND EQUIPMENT	Dec. 31, 2022
Text block [abstract]
PROPERTY AND EQUIPMENT	7. PROPERTY AND EQUIPMENT Computer Software Field Office, Road Total Cost At December 31, 2020 $ 451 $ 1,060 6,822 $ 5,142 $ 2,079 $ 15,554 Reclassification - - (275) 275 - - Additions 46 295 98 858 - 1,297 Disposals - - - (494) - (494) At December 31, 2021 $ 497 $ 1,355 6,645 $ 5,781 $ 2,079 $ 16,357 Additions 122 4 20 110 - 256 Balance as at December 31, 2022 $ 619 $ 1,359 6,665 $ 5,891 $ 2,079 $ 16,613 Accumulated Depreciation At December 31, 2020 $ 370 $ 841 3,761 $ 1,420 $ 1,583 $ 7,975 Reclassification - - (193) 193 - - Depreciation 57 202 612 885 389 2,145 Disposals - - - (382) - (382) At December 31, 2021 $ 427 $ 1,043 4,180 $ 2,116 $ 1,972 $ 9,738 Depreciation 89 172 523 982 61 1,827 Balance as at December 31, 2022 $ 516 $ 1,215 4,703 $ 3,098 $ 2,033 $ 11,565 Net book value at December 31, 2021 $ 70 $ 312 2,465 $ 3,665 $ 107 $ 6,619 Net book value at December 31, 2022 $ 103 $ 144 1,962 $ 2,793 $ 46 $ 5,048

FLOW-THROUGH SHARE PREMIUM LIAB

FLOW-THROUGH SHARE PREMIUM LIABILITY	12 Months Ended
FLOW-THROUGH SHARE PREMIUM LIABILITY	Dec. 31, 2022
Text block [abstract]
FLOW-THROUGH SHARE PREMIUM LIABILITY	8. FLOW-THROUGH SHARE PREMIUM LIABILITY IsoEnergy has raised funds through the issuance of flow-through shares. Based on Canadian tax law, IsoEnergy is required to spend this amount on eligible exploration expenditures by December 31 of the year following the year in which the shares were issued. The premium received for a flow-through share, which is the price received for the share in excess of the market price of the share, is recorded as a flow-through share premium liability. This liability is subsequently reduced when the required exploration expenditures are made, on a pro rata basis, and accordingly, a recovery of flow-through premium is then recorded as a reduction in the deferred tax expense to the extent that deferred income tax assets are available. As of December 31, 2022, IsoEnergy is obligated to spend $ by December 31, 2023 on eligible exploration expenditures. As the commitment is satisfied, the remaining balance of the flow-through premium liability is derecognized. The flow-through share premium liability for the years ended December 31, is comprised of: 2022 2021 Balance, beginning of year $ - $ - Liability incurred on flow-through shares issued 2,115 - Settlement of flow-though share liability on expenditures (46) - Balance, end of year $ 2,069 $ -

CONVERTIBLE DEBENTURES

CONVERTIBLE DEBENTURES	12 Months Ended
CONVERTIBLE DEBENTURES	Dec. 31, 2022
Text block [abstract]
CONVERTIBLE DEBENTURES	9. CONVERTIBLE DEBENTURES 2016 2017 2020 IsoEnergy IsoEnergy Total Fair value at December 31, 2020 $ 94,768 $ 86,568 $ 31,483 $ 14,034 $ - $ 226,853 Fair value adjustment 30,291 18,674 15,427 11,067 - 75,459 Settlement with shares (125,059) (105,242) - - - (230,301) Fair value at December 31, 2021 $ - $ - $ 46,910 $ 25,101 $ - $ 72,011 Fair value on issuance - - - - 5,296 5,296 Fair value adjustment - - 5,705 (2,832) (159) 2,714 Fair Value at December 31, 2022 $ - $ - $ 52,615 $ 22,269 $ 5,137 $ 80,021 The fair value of the debentures increased from $72,011 on December 31, 2021 to $80,021 at December 31, 2022, resulting from the issuance of the 2022 IsoEnergy Debentures and a mark-to-market 2016 and 2017 Convertible Debentures On February 18, 2021 and February 23, 2021, the holders of the 2016 and 2017 Debentures elected to convert their respective US$60 million aggregate principal amount of 7.5% unsecured convertible debentures, both due to mature on July 22, 2022, into common shares of the Company. The Company issued 25,794,247 and 22,289,088 common shares relating to the conversion of the principal of the 2016 and 2017 Debentures, respectively, and 89,729 and 87,316 common shares at a value of $849 relating to the accrued and unpaid interest up to the date of conversion for the 2016 and 2017 Debentures, respectively. The amounts recorded in other comprehensive income as a result of changes in credit risks of the 2016 and 2017 Debentures from inception through to conversion totaling losses of $4,016 were reclassified to accumulated deficit. The fair value of the 2016 and 2017 Debentures at conversion was based on the number of shares issued at the closing share price on the conversion date. The closing share price on February 18, 2021 was $4.69 and $4.88 on February 23, 2021 and the conversion price for the 2016 Debentures was US$2.33 and US$2.69 for the 2017 Debentures. The fair value of the shares issued for interest was based on the closing share price on the date of issuance and recorded as interest expense in the consolidated statement of net loss and comprehensive loss. 2020 Convertible Debentures On May 27, 2020, the Company issued US$ 15 ) associated with the interest payment. The fair value of the shares issued for interest was based on the closing share price on the dates of issuance and recorded as interest expense in the consolidated statement of net loss and comprehensive loss. The 2020 Debentures bear interest at a rate of 7.5% per annum, payable semi-annually in US dollars on June 10 and December 10 in each year. Two thirds of the interest (equal to 5% per annum) is payable in cash and one third of the interest (equal to 2.5% per annum) is payable, subject to any required regulatory approval, in common shares of the Company, using the volume-weighted average trading price (“VWAP”) of the common shares on the exchange or market that has the greatest trading volume in the Company’s common shares for the 20 consecutive trading days ending three trading days preceding the date on which such interest payment is due. The 2020 Debentures are convertible, from time to time, into common shares of the Company at the option of the debenture holders under certain conditions. The 2020 Debentures were valued using a convertible bond pricing model based on a system of two coupled Black-Scholes equations where the debt and equity components are separately valued based on different default risks and assumptions. The inputs used in the pricing model as at December 31, 2022 and December 31, 2021 are as follows: December 31, 2022 December 31, 2021 Volatility 46.00% 40.00% Expected life in years 2.41 years 3.41 years Risk free interest rate 4.35% 1.78% Expected dividend yield 0% 0% Credit spread 17.96% 16.88% Underlying share price of the Company $5.99 $5.54 Conversion exercise price $2.34 $2.34 Exchange rate (C$:US$) $0.738 $0.791 2020 IsoEnergy Debentures On August 18, 2020, IsoEnergy entered into a US$6 million private placement of unsecured convertible debentures (the “2020 IsoEnergy Debentures”). The 2020 IsoEnergy Debentures are convertible at the holder’s option at a conversion price of $0.88 into a maximum of 9,206,311 common shares of IsoEnergy. IsoEnergy received gross proceeds of $7,902 (US$6,000). A 3% establishment fee of $272 (US$180) was also paid to the debenture holders through the issuance of 219,689 common shares in IsoEnergy. The fair value of the 2020 IsoEnergy Debentures on issuance date was determined to be $7,630 (US$5,820). During the year ended December 31, 2022, IsoEnergy incurred interest expense of $670, of which $476 was settled in cash and the balance through the issuance of 63,890 IsoEnergy shares. The 2020 IsoEnergy Debentures were valued using a convertible bond pricing model based on a system of two coupled Black-Scholes equations where the debt and equity components are separately valued based on different default risks and assumptions. The inputs used in the pricing model as at December 31, 2022 and December 31, 2021 are as follows: December 31, 2022 December 31, 2021 Volatility 52.80% 50.00% Expected life in years 2.6 years 3.6 years Risk free interest rate 4.27% 1.78% Expected dividend yield 0% 0% Credit spread 23.85% 21.86% Underlying share price of IsoEnergy $2.91 $3.74 Conversion exercise price $0.88 $0.88 Exchange rate (C$:US$) $0.738 $0.791 2022 IsoEnergy Debentures On December 6, 2022, IsoEnergy entered into a US$4 million private placement of unsecured convertible debentures (the “2022 IsoEnergy Debentures”). The 2022 IsoEnergy Debentures are convertible at the holder’s option at a conversion price of $4.33 into a maximum of 1,464,281 common shares of IsoEnergy. IsoEnergy received gross proceeds of $5,460 (US$4,000). A 3% establishment fee of $164 (US$120) was paid in cash to the debenture holders. The fair value of the IsoEnergy Debentures on issuance date was determined to be $ (US$ ). During the year ended December 31, 2022, IsoEnergy incurred interest expense of $ , of which $ was settled in cash and the balance through the issuance of IsoEnergy shares. The 2022 IsoEnergy Debentures were valued using a convertible bond pricing model based on a system of two coupled Black-Scholes equations where the debt and equity components are separately valued based on different default risks and assumptions. December 31, 2022 December 6, 2022 Volatility 52.80% 52.41% Expected life in years 4.9 years 5.0 years Risk free interest rate 3.76% 3.35% Expected dividend yield 0% 0% Credit spread 23.85% 23.91% Underlying share price of IsoEnergy $2.91 $3.10 Conversion exercise price $4.33 $4.33 Exchange rate (C$:US$) $0.738 $0.732

LEASES

LEASES	12 Months Ended
LEASES	Dec. 31, 2022
Presentation of leases for lessee [abstract]
LEASES	10. LEASES (a) Right-of-use December 31, 2022 December 31, 2021 Right-of-use $ 2,640 $ 3,544 Additions - 29 Disposals - (147) Depreciation (707) (786) Balance, end of period $ 1,933 $ 2,640 The right-of-use (b) Lease liabilities December 31, 2022 December 31, 2021 Lease liabilities, beginning of period $ 3,169 $ 4,031 Terminations - (124) Interest expense on lease liabilities 207 265 Payment of lease liabilities (913) (1,003) Balance, end of period $ 2,463 $ 3,169 Current portion 775 706 Non-current 1,688 2,463 Balance, end of period $ 2,463 $ 3,169 The undiscounted values of the lease liabilities as at December 31, 2022 was $ (December 31, 2021 - $ ). (c) Amounts relating to short-term and variable leases Year ended December 31, 2022 2021 Expense relating to short-term leases $ 3,205 $ 1,975 Expense relating to variable lease payments $ 417 $ 417 The Company engages drilling companies to carry out its drilling programs on its exploration and evaluation properties. The drilling companies provide all required equipment for these drilling programs. These contracts are short-term in nature and the Company has elected not to recognize right-of-use assets and associated lease liabilities in respect to these contracts but rather to recognize lease payments associated with these leases as incurred over the lease term. Payments to the drilling companies for the year ended December 31, 2022 were $ (December 31, 2021 - $ ).

SHARE CAPITAL

SHARE CAPITAL	12 Months Ended
SHARE CAPITAL	Dec. 31, 2022
Text block [abstract]
SHARE CAPITAL	11. SHARE CAPITAL (a) Authorized capital Unlimited common shares without par value. Unlimited preferred shares without par value. For the year ended December 31, 2022: Share issuances during the year ended December 31, 2022 were: During the year ended December 31, 2022, the Company issued 3,247,332 shares on the exercise of stock options for gross proceeds of $10,001 ( Note 11(b)). As a result of the exercises, $6,260 was reclassified from reserves to share capital. On June 10, 2022, the Company issued 42,252 shares relating to the interest payment on the 2020 Debentures at a fair value of $251 (Note 9). On December 9, 2022, the Company issued 42,328 shares relating to the interest payment on the 2020 Debentures at a fair value of $235 (Note 9). For the year ended December 31, 2021: Share issuances during the year ended December 31, 2021 were: On February 3, 2021 and February 23, 2021, the Company issued an aggregate of 200,000 common shares to arm’s length parties to advance the development of the Rook 1 property at a fair value of $900. On February 18, 2021 and February 23, 2021, the Company issued 25,794,247 and 22,289,088 common shares relating to the conversion of the principal of the 2016 and 2017 Debentures at a fair value of $125,059 and $105,242, respectively. In addition, 89,729 and 87,316 common shares were issued relating to the accrued and unpaid interest up to the date of conversion for the 2016 and 2017 Debentures at a fair value of $407 and $442, respectively. On March 11, 2021, the Company completed a bought deal financing where 33,400,000 common shares of the Company were issued at a price of $4.50 per common share (the “Offering Price”) for gross proceeds of approximately $150,300. On March 16, 2021, the Company closed the over-allotment of 5,010,000 common shares of the Company at the Offering Price for additional proceeds of $22,545. In connection with the financing, $9,555 was incurred for share issue costs. On June 10, 2021, the Company issued shares relating to the interest payment on the 2020 Debentures at a fair value of $ . On June 30, 2021, the Company issued 400,000 common shares at a price of AUD $5.60 for total proceeds of $2,074 in relation to its public listing on the ASX. In connection with the financing, $1,035 was incurred for share issuance costs. On December 10, 2021, the Company issued 36,818 shares relating to the interest payment on the 2020 Debentures at a fair value of $202. During the year ended December 31, 2021, the Company issued 10,020,001 shares on the exercise of stock options for gross proceeds of $25,962 (Note 11(b)). As a result of the exercises, $17,122 was reclassified from reserves to share capital. (b) Share options Pursuant to the Company’s stock option plan, directors may, from time to time, authorize the issuance of options to directors, officers, employees and consultants of the Company, enabling them to acquire up to % of the issued and outstanding common shares of the Company. The options can be granted for a maximum term of 10 years and are subject to vesting provisions as determined by the Board of Directors of the Company. A summary of the changes in the share options is presented below: Options outstanding Weighted average At December 31, 2020 36,473,162 $ 2.47 Granted 17,400,000 5.61 Exercised (10,020,001) 2.59 Expired (266,666) 2.18 Forfeited (150,001) 5.84 At December 31, 2021 43,436,494 $ 3.69 Granted 9,744,729 5.47 Exercised (3,247,332) 3.08 Expired (65,000) 5.52 Forfeited (230,001) 5.33 At December 31, 2022 – Outstanding 49,638,890 $ 4.07 At December 31, 2022 – Exercisable 37,499,176 $ 3.59 The following table summarizes information about the exercisable share options outstanding as at December 31, 2022: Number of share options outstanding Number of share options exercisable Exercise prices (C$) Remaining contractual life (years) Expiry date 75,000 75,000 2.39 0.28 April 13, 2023 3,450,000 3,450,000 2.85 0.44 June 8, 2023 100,000 100,000 2.66 0.47 June 20, 2023 720,482 720,482 2.49 0.64 August 21, 2023 2,300,000 2,300,000 2.41 1.00 December 31, 2023 500,000 500,000 2.27 1.22 March 21, 2024 250,000 250,000 2.22 1.24 March 27, 2024 3,250,000 3,250,000 1.92 1.45 June 12, 2024 188,679 188,679 1.59 1.63 August 16, 2024 3,533,334 3,533,334 1.59 1.98 December 24, 2024 3,875,000 3,875,000 1.80 2.45 June 12, 2025 4,796,666 4,796,666 3.24 2.95 December 11, 2025 250,000 166,667 5.16 3.13 February 16, 2026 650,000 433,335 4.53 3.25 April 1, 2026 8,900,000 5,933,334 5.84 3.44 June 10, 2026 7,130,000 4,753,346 5.44 3.96 December 14, 2026 94,277 - 5.76 4.05 January 18, 2027 3,565,000 1,188,333 5.31 4.63 August 17, 2027 55,452 - 5.41 4.76 October 4, 2027 5,955,000 1,985,000 5.57 4.97 December 18, 2027 49,638,890 37,499,176 3.59 2.60 The following weighted average assumptions were used for Black-Scholes valuation of the share options granted: For the year ended December 31, 2022 December 31, 2021 Expected stock price volatility 62.38% 60.42% Expected life of options 5.00 years 5.00 years Risk free interest rate 2.87% 1.03% Expected forfeitures 0% 0% Expected dividend yield 0% 0% Weighted average fair value per option granted in period $3.01 $2.88 Weighted average exercise price $5.47 $5.61 Share-based payments for options vested for the year ended December 31, 2022 amounted to $ (December 31, 2021 – $ ) of which $ (December 31, 2021 – $ ) was expensed to the statement of net loss a nd comprehensive loss and $ (December 31, 2021 - $ ) was capitalized to exploration and evaluation assets (Note 6).

SUPPLEMENTAL CASH FLOW INFORMAT

SUPPLEMENTAL CASH FLOW INFORMATION	12 Months Ended
SUPPLEMENTAL CASH FLOW INFORMATION	Dec. 31, 2022
Text block [abstract]
SUPPLEMENTAL CASH FLOW INFORMATION	12. SUPPLEMENTAL CASH FLOW INFORMATION The Company did not have any cash equivalents as at December 31, 2022 and December 31, 2021. a) Schedule of non-cash Year ended December 31 2022 Capitalized share-based payments $ Exploration and evaluation asset expenditures included in accounts payable and accrued liabilities 4,711 5,681 Interest expense included in accounts payable and accrued liabilities 85 79 Share consideration on sale of properties (Note 5) - 3,544

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	12 Months Ended
RELATED PARTY TRANSACTIONS	Dec. 31, 2022
Text block [abstract]
RELATED PARTY TRANSACTIONS	13. RELATED PARTY TRANSACTIONS The remuneration of key management which includes directors and management personnel responsible for planning, directing, and controlling the activities of the Company during the period was as follows: For the year ended December 31 2022 Short-term compensation (1) $ $ Share-based payments (2) 32,210 29,231 Consulting fees (3) (4) 231 212 $ $ (1) (2) Share-based payments to key management personnel for the year ended December 31, 2022 amounted to $ (2021 - $ ) of which $ (2021 - $ ) was expensed and $ (2021 - $ ) was capitalized to exploration and evaluation assets. (3) (4) As at December 31, 2022, there was $ (December 31, 2021 - $ ) included in accounts payable and accrued liabilities owing to its directors and officers for compensation.

CAPITAL MANAGEMENT

CAPITAL MANAGEMENT	12 Months Ended
CAPITAL MANAGEMENT	Dec. 31, 2022
Text block [abstract]
CAPITAL MANAGEMENT	14. CAPITAL MANAGEMENT The Company manages its capital structure and adjusts it, based on the funds available to the Company, to support the acquisition, exploration, development and evaluation of assets. To effectively manage the entity’s capital requirements, the Company has in place a planning, budgeting, and forecasting process to help determine the funds required to ensure the Company has the appropriate liquidity to meet its operating and growth objectives. The Board of Directors does not establish quantitative return on capital criteria for management, but rather relies on the expertise of the Company’s management to sustain the future development of the business. In the management of capital, the Company considers all components of equity and debt, net of cash, and is dependent on third party financing, whether through debt, equity, or other means. Although the Company has been successful in raising funds to date, there is no assurance that the Company will be successful in obtaining required financing in the future or that such financing will be available on terms acceptable to the Company. The properties in which the Company currently has an interest are in the exploration and development stage. As such, the Company has historically relied on the equity markets and convertible debt to fund its activities. The Company will continue to assess new properties and seek to acquire an interest in additional properties if it determines that there is sufficient geologic or economic potential and if it has adequate financial resources to do so. The Company is not subject to externally imposed capital requirements. There were no changes in the Company’s approach to capital management during the period. In the management of capital, the Company includes the components of equity, and convertible debentures, net of cash. Capital, as defined above, is summarized in the following table: December 31, 2022 December 31, 2021 Equity $ $ Convertible debentures (Note 9) 80,021 72,011 535,438 533,359 Less: Cash (134,447) (201,804) $ $

FINANCIAL INSTRUMENTS AND RISK

FINANCIAL INSTRUMENTS AND RISK MANAGEMENT	12 Months Ended
FINANCIAL INSTRUMENTS AND RISK MANAGEMENT	Dec. 31, 2022
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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT	15. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT The Company’s financial instruments consist of cash, marketable securities, amounts receivable, accounts payable and accrued liabilities and convertible debentures. Financial instruments measured at fair value are classified into one of three levels in the fair value hierarchy according to the relative reliability of the inputs used to estimate the fair values. The three levels of the fair value hierarchy are: ● Level 1 – unadjusted quoted prices in active markets for identical assets or liabilities ● Level 2 – inputs other than quoted prices that are observable for the asset or liability either directly or indirectly; and ● Level 3 – inputs that are not based on observable market data. The fair values of the Company’s cash, amounts receivable, and accounts payable and accrued liabilities approximate their carrying values due to their short-term nature. The marketable securities are re-measured The convertible debentures are re-measured Financial Risk The Company is exposed to varying degrees of a variety of financial instrument-related risks. The Board approves and monitors the risk management processes, controlling and reporting structures. The type of risk exposure and the way in which such exposure is managed is provided as follows: Credit Risk Credit risk is the risk that one party to a financial instrument will fail to discharge an obligation and cause the other party to incur a financial loss. Financial instruments potentially subject to credit risk are cash and amounts receivable. The Company’s maximum exposure to credit risk is as follows: December 31, 2022 December 31, 2021 Cash $ 134,447 $ 201,804 Amounts receivable 1,801 1,178 $ 136,248 $ 202,982 Liquidity Risk Liquidity risk is the risk that an entity will encounter difficulty in raising funds to meet commitments associated with financial instruments. Liquidity requirements are managed based on expected cash flows to ensure that there is sufficient capital to meet short-term obligations. The Company’s approach to managing liquidity risk is to ensure that it will have sufficient liquidity to meet liabilities when due. As at December 31, 2022, NexGen had cash of $134,447 to settle current liabilities of $16,567. The Company’s significant undiscounted commitments at December 31, 2022 are as follows: Less than 1 year 1 to 3 years 4 to 5 years Over 5 years Total Trade and other payables $ $ $ $ - $ 13,723 Convertible debentures (Note 9) - 74,884 5,137 - 80,021 Lease liabilities (Note 10) 1,346 2,574 - - 3,920 $ $ $ $ - $ Foreign Currency Risk The functional currency of the Company and its subsidiaries is the Canadian dollar. The Company is affected by currency transaction risk and currency translation risk. Consequently, fluctuations of the Canadian dollar in relation to other currencies impact the fair value of financial assets, liabilities and operating results. Financial assets and liabilities subject to currency translation risk primarily includes US dollar denominated cash, US dollar accounts payable, 2020 Debentures and IsoEnergy Debentures. The Company maintains Canadian and US dollar bank accounts in Canada. The Company is exposed to foreign exchange risk on its US dollar denominated 2020 Debentures, 2020 IsoEnergy Debentures and 2022 IsoEnergy Debentures. At maturity, the US$25 million principal amount of the 2020 Debentures, 2020 IsoEnergy Debentures and 2022 IsoEnergy Debentures is due in full, and prior to maturity, at a premium upon the occurrence of certain events. The Company holds sufficient US dollars to make all cash interest payments due under the 2020 Debentures, 2020 IsoEnergy Debentures and 2022 IsoEnergy Debentures until maturity but not to pay the principal amount. Accordingly, the Company is subject to risks associated with fluctuations in the Canadian/US dollar exchange rate that may make the 2020 Debentures, 2020 IsoEnergy Debentures and 2022 IsoEnergy Debentures more costly to repay. As at December 31, 2022, the Company’s US dollar net financial liabilities were US$ . Thus a % change in the Canadian dollar versus the US dollar exchange rates would give rise to a $ change in net loss and comprehensive loss. The Company has not entered into any agreements or purchased any instruments to hedge possible currency risks at this time. Equity and Commodity Price Risk The Company is exposed to price risk with respect to commodity and equity prices. Equity price risk is defined as the potential adverse impact on the Company’s earnings due to movements in individual equity prices or general movements in the level of the stock market. Accordingly, significant movements in share price may affect the valuation of the Marketable Securities and Convertible Debentures which may adversely impact its earnings. Commodity price risk is defined as the potential adverse impact on earnings and economic value due to commodity price movements and volatility. Future declines in commodity prices may impact the valuation of long-lived assets. The Company closely monitors commodity prices of uranium, individual equity movements, and the stock market to determine the appropriate course of action, if any, to be taken by the Company. Interest Rate Risk Interest rate risk is the risk that the future cash flows of a financial instrument will fluctuate due to changes in market interest rates. The Company holds its cash in bank accounts that earn variable interest rates. Due to the short-term short-term

NON-CONTROLLING INTERESTS

NON-CONTROLLING INTERESTS	12 Months Ended
NON-CONTROLLING INTERESTS	Dec. 31, 2022
Text block [abstract]
NON-CONTROLLING INTERESTS	16. NON-CONTROLLING As at December 31, 2022, NexGen held 100% ownership of the subsidiaries with the exception of IsoEnergy, where it retained 50.1% of IsoEnergy’s outstanding common shares (December 31, 2021 – 50.5%) (Note 4(b)). For financial reporting purposes, the assets, liabilities, results of operations, and cash flows of the Company’s wholly owned subsidiaries and non-wholly owned subsidiary, IsoEnergy, are included in NexGen’s consolidated financial statements. Third party investors’ share of the net earnings of IsoEnergy is reflected in the loss and comprehensive loss attributable to non-controlling interests in the consolidated statements of loss and comprehensive loss. Summarized financial information for IsoEnergy Ltd. is as follows: 2022 2021 Cash $ 19,913 $ 13,617 Other current assets 212 236 Marketable securities 5,775 9,315 Non-current 71,215 61,022 Total assets $ $ Current liabilities 2,622 641 Non-current 28,273 27,636 Total liabilities $ 30,895 $ 28,277 Loss from operations $ 7,375 $ 15,781 Loss and comprehensive loss $ 10,368 $ 10,819 Net cash flow from operating activities (2,766) (2,751) Net cash flow from investing activities (8,694) (5,336) Net cash flow from financing activities 17,756 7,669 Net increase (decrease) in cash $ 6,296 $ (418) On December Also on December 6, 2022, IsoEnergy completed an additional private placement with third party investors for gross proceeds of $7,027 and issued the 2022 IsoEnergy Debentures for gross proceeds of US $4,000 (Note 9). As at December 31, 2022, the non-controlling

INCOME TAXES

INCOME TAXES	12 Months Ended
INCOME TAXES	Dec. 31, 2022
Text block [abstract]
INCOME TAXES	17. INCOME TAXES A reconciliation of income taxes at statutory rates with the reported taxes is as follows: 2022 2021 Net loss for the year $ (61,310) $ (125,826) Statutory rate 27.00% 27.00% Expected income tax recovery $ (16,554) $ (33,973) Permanent differences 9,662 8,348 Impact of flow-through shares 30 1,080 Impact of (gain) loss recognized in other comprehensive income (17) 79 Impact of loss on convertible debt 422 20,572 Change in unrecognized deductible temporary differences 5,412 5,064 Other 3 (48) Deferred income tax expense (recovery) $ (1,042) $ 1,122 The Company’s income tax expense is comprised of the following: 2022 2021 Deferred income tax expense (recovery) $ (1,042) $ 1,122 Total $ (1,042) $ 1,122 The Company’s deferred tax items recognized in OCI during the year: 2022 2021 Change in fair value of convertible debentures attributable to the change in credit risk $ 17 $ (79) Change in fair value of marketable securities (478) 780 Total $ $ 701 The tax effects of temporary differences between amounts recorded in the Company’s accounts and the corresponding amounts as calculated for income tax purposes give rise to the following deferred tax (assets) and liabilities: 2022 2021 Exploration and evaluation assets $ 39,120 $ 26,258 Convertible debentures 66 241 Non-capital (38,333) (24,501) Share issuance costs (208) (168) Equipment (79) (74) Marketable securities 301 780 Net deferred tax liabilities $ 867 $ 2,536 Movement in the Company’s deferred tax liability balance in the year is as follows: 2022 2021 Opening balance $ $ 712 Recognized in income tax expense (996) 1,122 Recognized in OCI/equity (673) 702 Net deferred tax liabilities $ 867 $ The significant components of the Company’s temporary differences, unused tax credits and unused tax losses that have not been included on the consolidated statement of financial position are as follows: Temporary Differences 2022 Expiry Date Range 2021 Expiry Date Range Non-capital $ 144,633 2029 to 2042 $ 121,471 2029 to 2041 Share issuance costs 7,156 - 9,672 - Equipment 911 - 765 - Donations 153 2023 to 2027 133 2022 to 2026 Tax attributes are subject to review, and potential adjustment, by tax authorities.

SEGMENT INFORMATION

SEGMENT INFORMATION	12 Months Ended
SEGMENT INFORMATION	Dec. 31, 2022
Text block [abstract]
SEGMENT INFORMATION	18. SEGMENTED INFORMATION The Company operates in one reportable segment, being the acquisition, exploration and development of uranium properties. All of the Company’s non-current assets are located in Canada.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2022
Text block [abstract]
SUBSEQUENT EVENTS	19. SUBSEQUENT EVENTS Subsequent to December 31, 2022, stock options were exercised for gross proceeds of and 500,000 On January 6, 2023, NexGen established an at-the-market

SIGNIFICANT ACCOUNTING POLICI_2

SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SIGNIFICANT ACCOUNTING POLICIES (Policies)	Dec. 31, 2022
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Functional and presentation currency	(a) Functional and presentation currency These financial statements are presented in Canadian dollars, which is the functional currency of the Company and its subsidiaries. Translation of transactions and balances Foreign currency transactions are translated into the functional currency using the exchange rates prevailing at the dates of the transactions or valuation where items are re-measured. Non-monetary
Consolidation	(b) Consolidation These consolidated financial statements include the accounts of the Company and its subsidiaries: NXE Energy Royalty Ltd., NXE Energy SW1 Ltd., NXE Energy SW3 Ltd. and IsoEnergy. Shares of IsoEnergy were issued to third parties as part of financings since its inception, thereby resulting in the recognition of non-controlling interests. The financial results of the subsidiaries are included in these consolidated financial statements from the date of incorporation. Intercompany balances and transactions are eliminated on consolidation. Name of Subsidiary Percentage Ownership as at December 31, 2022 Percentage Ownership as at December 31, 2021 NXE Energy Royalty Ltd. 100% 100% NXE Energy SW1 Ltd. 100% 100% NXE Energy SW3 Ltd. 100% 100% IsoEnergy Ltd. 50.1% 50.5%
Cash	(c) Cash Cash includes deposits held with banks that are available on demand.
Exploration and evaluation assets	(d) Exploration and evaluation assets Once the legal rights to explore a property have been obtained, exploration and evaluation costs are capitalized as exploration and evaluation assets on an area of interest basis pending determination of the technical feasibility and the commercial viability of the project. Capitalized costs include costs directly related to exploration and evaluation activities in the area of interest. When a claim is relinquished or a project is abandoned, the related costs are recognized in the statement of net loss and comprehensive loss immediately. Proceeds received from the sale of any interest in a property will be credited against the carrying value of the property, with any excess included in operations for the period. If a property is abandoned, the acquisition and deferred exploration costs will be written off to operations. Although the Company has taken steps to verify title to exploration and evaluation assets in which it has an interest, in accordance with industry standards for the current stage of exploration of such properties, these procedures do not guarantee the Company’s title. A property may be subject to unregistered prior agreements or inadvertent non-compliance Management regularly assesses exploration and evaluation assets for events or circumstances that may indicate possible impairment. Once the technical feasibility and commercial viability of the extraction of mineral resources in an area of interest are demonstrable, exploration and evaluation assets attributable to that area of interest are first tested for impairment and then reclassified to mining assets and development assets within property, plant and equipment.
Equipment	(e) Equipment (i) Recognition and measurement Items of equipment are stated at cost less accumulated depreciation and impairment losses. Cost includes expenditures that are directly attributable to the acquisition of the asset. (ii) Subsequent costs The cost of replacing a part of an item in the carrying amount of equipment is recognized when that cost is incurred, if it is probable that the future economic benefits embodied within the item will flow to the Company and the cost of the item can be measured reliably. (iii) Depreciation The carrying amounts of equipment (including initial and subsequent capital expenditures) are amortized to their estimated residual value over the estimated useful lives of the specific assets concerned. Depreciation is calculated over the estimated useful lives of each significant component as follows: - Computing equipment 55% declining balance basis - Software 55% declining balance basis - Field equipment 20% declining balance basis - Leasehold improvements Lease term straight-line basis - Road 5-year - Lease right-of-use Lease term straight-line basis - Vehicles 2-year Depreciation methods, useful lives, and residual values are reviewed at least annually and adjusted if appropriate. (iv) Disposal Gains and losses on disposal of an item of equipment are determined by comparing the proceeds from disposal with the carrying amount of the item of equipment and are recognized in the statement of net loss and comprehensive loss. (f) Leases
Leases	At inception of a contract, the Company assesses whether a contract is, or contains, a lease. A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. To assess whether a contract conveys the right to control the use of an identified asset, the Company assesses whether: ● The contract involves the use of an identified asset. This may be specific, explicitly or implicitly, and should be physically distinct or represent substantially all of the capacity of a physically distinct asset. If the supplier has a substantive substitution right, then the asset is not identified; ● The Company has the right to obtain substantially all of the economic benefit from use of the asset throughout the period of use; and ● The Company has the right to direct the use of the asset. The Company has this right when it has the decision-making rights that are most relevant to changing how and for what purpose the asset is used. The Company recognizes a right-of-use right-of-use The right-of-use right-of-use right-of-use right-of-use The lease liability is initially measured at the present value of the lease payments that are not paid at the commencement date, discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, the Company’s incremental borrowing rate. Generally, the Company uses its incremental borrowing rate as the discount rate. The lease liability is measured at amortized cost using the effective interest method. It is remeasured when there is a change in future lease payments arising from a change in index or rate, if there is a change in the Company’s estimate of the amount expected to be payable under a residual value guarantee, or if the Company changes its assessment of whether it will exercise a purchase, extension or termination option. When the lease liability is remeasured in this way, a corresponding adjustment is made to the carrying amount of the right-of-use right-of-use The Company has elected to apply the recognition exemption not to recognize right-of-use low-value
Impairment	(g) Impairment An impairment loss is recognized when the carrying amount of an asset, or its cash generating unit (“CGU”), exceeds its recoverable amount. A CGU is the smallest identifiable group of assets that generates cash inflows that are largely independent of the cash inflows from other assets or groups of assets. Impairment losses are recognized in profit and loss for the period. Impairment losses recognized in respect of CGUs are allocated first to reduce the carrying amount of any goodwill allocated to CGUs and then to reduce the carrying amount of the other assets in the unit on a pro-rata The recoverable amount of assets is the greater of an asset’s fair value less cost to sell and value in use. In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax An impairment loss is only reversed if there is an indication that the impairment loss may no longer exist and there has been a change in the estimates used to determine the recoverable amount, however, not to an amount higher than the carrying amount that would have been determined had no impairment loss been recognized in previous years.
Decommissioning and restoration provisions	(h) Decommissioning and restoration provisions Decommissioning and restoration provisions are recorded when a present legal or constructive obligation exists as a result of past events where it is probable that an outflow of resources embodying economic benefits will be required to settle the obligation, and a reliable estimate of the amount of the obligation can be made. The amount recognized as a provision is the best estimate of the consideration required to settle the present obligation at the reporting date, taking into account the risks and uncertainties surrounding the obligation and discount rates. Where a provision is measured using the cash flows estimated to settle the present obligation, its carrying amount is the present value of those cash flows discounted at the market discount rate. Over time the carrying value of the liability is increased for the changes in the present value based on the current market discount rates and liability risks. When some or all of the economic benefits required to settle a provision are expected to be recovered from a third party, the receivable is recognized as an asset if it is virtually certain that reimbursement will be received, and the amount receivable can be measured reliably. Changes in reclamation estimates are accounted for prospectively as a change in the corresponding capitalized cost. The Company did not have any decommissioning and restoration provisions for the years presented.
Share capital	(i) Share capital Common shares are classified as equity. Incremental costs directly attributable to the issue of common shares are recognized as a deduction from equity. Common shares issued for consideration other than cash, are valued based on their market value at the date the shares are issued. The Company has adopted a residual value method with respect to the measurement of shares and warrants issued as private placement units. The residual value method first allocates value to the more easily measurable component based on fair value and then the residual value, if any, to the less easily measurable component. The Company considers the fair value of common shares issued in the private placements to be the more easily measurable component and the common shares are valued at their fair value, as determined by the closing market price on the announcement date. The balance, if any, is allocated to the attached warrants. Any fair value attributed to the warrants is recorded as reserves.
Share-based payments	(j) Share-based payments The Company’s stock option plan allows Company employees, directors, officers and consultants to acquire shares of the Company. The fair value of options granted is recognized as share-based payments expense with a corresponding increase in equity reserves. The fair value of the options granted is measured using the Black-Scholes option pricing model, taking into account the terms and conditions upon which the options were granted. Fair value is measured at grant date, and each tranche is recognized using the graded vesting method over the period during which the options vest. At each financial reporting date, the amount recognized as an expense is adjusted to reflect the actual number of stock options that are expected to vest. In situations where equity instruments are issued to non-employees non-employees
Flow-through shares	(k) Flow-through shares Resource expenditure deductions for income tax purposes related to exploration activities funded by flow-through share arrangements are renounced to investors under Canadian income tax legislation. On issuance, the Company separates the flow-through share into i) a flow-through share premium, equal to the estimated premium, if any, investors paid for the flow-through feature, which is recognized as a liability due to the obligation to incur eligible expenditures and ii) share capital. Upon eligible exploration expenditures being incurred, the Company recognizes a deferred tax liability for the amount of tax deduction renounced to shareholders. To the extent that eligible deferred income tax assets are available, the Company will reduce the deferred income tax liability and records a deferred income tax recovery. Proceeds received from the issuance of flow-through shares must be expended on Canadian resource property exploration within a period of . Failure to expend such funds as required under the Canadian income tax legislation will result in a Part XII. tax to the Company on flow-through proceeds renounced under the “Look-back” Rule. If applicable, this tax is classified as an administration expense.
Loss per share	(l) Loss per share Basic loss per share is calculated by dividing the loss attributable to the Company’s common shareholders for the year by the weighted average number of common shares outstanding during the year. The Company uses the treasury stock method to compute the dilutive effect of options, warrants and other similar instruments. Under this method, the weighted average number of shares outstanding used in the calculation of diluted loss per share assumes that the deemed proceeds received from the exercise of stock options, share purchase warrants and their equivalents would be used to repurchase common shares of the Company at the average market price during the period. Shares to be issued on existing stock options, warrants and convertible debentures have not been included in the computation of diluted loss per share as to do so would be anti-dilutive. Accordingly, basic and diluted loss per share is the same for the years presented.
Income taxes	(m) Income taxes Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in the statement of net loss except to the extent that it relates to items recognized directly in equity or in other comprehensive income. Current tax is the expected tax payable or receivable on the taxable income or loss for the year, using tax rates enacted at the reporting date, and any adjustment to tax payable in respect of previous years. Deferred tax is recognized in respect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. Deferred tax is not recognized for the following temporary differences: the initial recognition of assets or liabilities in a transaction that is not a business combination and that affects neither accounting nor taxable profit or loss, and differences relating to investments in subsidiaries and jointly controlled entities to the extent that it is probable that they will not reverse in the foreseeable future. In addition, deferred tax is not recognized for taxable temporary differences arising on the initial recognition of goodwill. Deferred tax is measured at the tax rates that are expected to be applied to temporary differences when they reverse, based on the laws that have been enacted or substantively enacted by the reporting date. Deferred tax assets and liabilities are offset if there is a legally enforceable right to offset current tax liabilities and assets, and they relate to income taxes levied by the same tax authority on the same taxable entity, or on different tax entities, but they intend to settle current tax liabilities and assets on a net basis or their tax assets and liabilities will be realized simultaneously. A deferred tax asset is recognized for unused tax losses, tax credits and deductible temporary differences, to the extent that it is probable that future taxable profits will be available against which they can be utilized. Future taxable profits are determined based on the reversal of relevant taxable temporary differences. If the amount of taxable temporary differences is insufficient to recognize a deferred tax asset in full, then future taxable profits, adjusted for reversals of existing temporary differences, are considered, based on the business plan for the Company. Deferred tax assets are reviewed at each reporting date and are reduced to the extent that it is no longer probable that the related tax benefit will be realized.
Financial instruments	(n) Financial instruments (i) Classification The Company classifies its financial assets in the following categories: at fair value through profit or loss (“FVTPL”), at fair value through other comprehensive income (“FVTOCI”) or at amortized cost. The Company determines the classification of financial assets at initial recognition. The classification of debt instruments is driven by the Company’s business model for managing the financial assets and their contractual cash flow characteristics. Equity instruments that are held for trading (including all equity derivative instruments) are classified as FVTPL. For other equity instruments, on the day of acquisition the Company can make an irrevocable election (on an instrument-by-instrument The Company has the following financial instruments, which are classified under IFRS 9 in the table below: Financial assets/liabilities Classification Cash Amortized cost Amounts receivable Amortized cost Marketable securities FVTOCI Accounts payable and accrued liabilities Amortized cost Convertible debentures FVTPL (ii) Measurement Financial assets at FVTOCI Elected investments in equity instruments at FVTOCI are initially recognized at fair value plus transaction costs. Subsequently they are measured at fair value, with gains and losses arising from changes in fair value recognized in other comprehensive loss. The Company’s Marketable Securities have been recognized at FVTOCI (Note 5). Financial assets and liabilities at amortized cost Financial assets and liabilities at amortized cost are initially recognized at fair value, and subsequently carried at amortized cost less any impairment. Financial assets and liabilities at FVTPL Financial assets and liabilities carried at FVTPL are initially recorded at fair value and transaction costs are expensed in the consolidated statements of net loss. Realized and unrealized gains and losses arising from changes in the fair value of the financial assets and liabilities held at FVTPL are included in the consolidated statements of net loss in the period in which they arise. Where management has opted to recognize a financial liability at FVTPL, any changes associated with the Company’s own credit risk will be recognized in other comprehensive loss. The convertible debentures have been recognized at FVTPL (Note 9). (iii) Impairment of financial assets at amortized cost Under IFRS 9, the Company recognizes a loss allowance using the expected credit loss model on financial assets that are measured at amortized cost. At each reporting date, the Company measures the loss allowance for the financial asset at an amount equal to the lifetime expected credit losses if the credit risk on the financial asset has increased significantly since initial recognition. If at the reporting date, the financial asset has not increased significantly since initial recognition, the Company measures the loss allowance for the financial asset at an amount equal to twelve month expected credit losses. Impairment losses on financial assets carried at amortized cost are reversed in subsequent periods if the amount of the loss decreases and the decrease can be objectively related to an event occurring after the impairment was recognized. (iv) Derecognition Financial assets The Company derecognizes financial assets only when the contractual rights to cash flows from the financial assets expire, or when it transfers the financial assets and substantially all the associated risks and rewards of ownership to another entity. Gains and losses on derecognition are generally recognized in the consolidated statements of net loss. However, gains and losses on derecognition of financial assets classified as FVTOCI remain within the accumulated other comprehensive loss. Financial liabilities The Company derecognizes financial liabilities only when its obligations under the financial liabilities are discharged, cancelled or expired. The difference between the carrying amount of the financial liability derecognized and the consideration paid and payable, including any non-cash
Future accounting pronouncements	(o) Future accounting pronouncements The following standard has not been adopted by the Company and is being evaluated: Amendments to IAS 1 related to the Classification of Liabilities as Current or Non-Current, non-current, When a liability includes a counterparty conversion option that involves a transfer of the company’s own equity instruments, the conversion option is recognised as either equity or a liability separately from the host liability under IAS 32 Financial Instruments: Presentation. The IASB has now clarified that when a company classifies the host liability as current or non-current, non-current.

SIGNIFICANT ACCOUNTING POLICI_3

SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
SIGNIFICANT ACCOUNTING POLICIES (Tables)	Dec. 31, 2022
Text block [abstract]
Summary of Company's Ownership Percentage in Each of Its Subsidiaries	The following table sets forth the Company’s ownership percentage in each of its subsidiaries as of December 31, 2022: Name of Subsidiary Percentage Ownership as at December 31, 2022 Percentage Ownership as at December 31, 2021 NXE Energy Royalty Ltd. 100% 100% NXE Energy SW1 Ltd. 100% 100% NXE Energy SW3 Ltd. 100% 100% IsoEnergy Ltd. 50.1% 50.5%
Summary of Depreciation Over the Estimated Useful Lives of Each Significant Component	Depreciation is calculated over the estimated useful lives of each significant component as follows: - Computing equipment 55% declining balance basis - Software 55% declining balance basis - Field equipment 20% declining balance basis - Leasehold improvements Lease term straight-line basis - Road 5-year - Lease right-of-use Lease term straight-line basis - Vehicles 2-year Depreciation methods, useful lives, and residual values are reviewed at least annually and adjusted if appropriate.
Schedule of accounting policy for financial instruments	The Company has the following financial instruments, which are classified under IFRS 9 in the table below: Financial assets/liabilities Classification Cash Amortized cost Amounts receivable Amortized cost Marketable securities FVTOCI Accounts payable and accrued liabilities Amortized cost Convertible debentures FVTPL

MARKETABLE SECURITIES (Tables)

MARKETABLE SECURITIES (Tables)	12 Months Ended
MARKETABLE SECURITIES (Tables)	Dec. 31, 2022
Clover, Gemini and Tower uranium properties [Member]
Statement1 [Line Items]
Summary of Detailed Information about Disposal of Marketable Securities	The Properties had a book value of $ , which resulted in a gain of $ in 2021. Disposition of Properties Marketable securities received $ 2,068 Cash 192 Proceeds – disposition of properties 2,260 Cost – disposition of properties (35) Gain on sale of assets $ 2,225
Mountain Lake property [Member]
Statement1 [Line Items]
Summary of Detailed Information about Disposal of Marketable Securities	The Mountain Lake property had a book value of $126, which resulted in a gain of $1,370 in 2021. Disposition of Properties Marketable securities received $ 1,476 Cash 20 Proceeds – disposition of properties 1,496 Cost – disposition of properties (126) Gain on sale of assets $ 1,370

EXPLORATION AND EVALUATION AS_2

EXPLORATION AND EVALUATION ASSETS (Tables)	12 Months Ended
EXPLORATION AND EVALUATION ASSETS (Tables)	Dec. 31, 2022
Text block [abstract]
Summary of Capitalized Costs on Projects	Rook I Other Athabasca IsoEnergy Total Acquisition cost Balance at December 31, 2021 $ 235 1,458 $ 26,660 28,353 Additions - - 10 10 Dispositions - - (42) (42) Balance as at December 31, 2022 $ 235 1,458 $ 26,628 28,321 Deferred exploration costs Balance at December 31, 2021 $ 260,941 9,180 $ 28,069 298,190 Additions: General exploration and drilling 7,705 - 5,613 13,318 Environmental, permitting, and engagement 12,005 - - 12,005 Technical, engineering and design 32,703 - - 32,703 Geochemistry and assays - - 190 190 Geological and geophysical 1,941 423 1,593 3,957 Labour and wages 8,818 - 836 9,654 Share-based payments (Note 11) 4,532 - 1,832 6,364 Travel 367 - 178 545 Total Additions 68,071 423 10,243 78,737 Balance as at December 31, 2022 $ 329,012 9,603 $ 38,312 376,927 Total costs, December 31, 2022 $ 329,247 11,061 $ 64,940 405,248 Rook I Other Athabasca IsoEnergy Total Acquisition cost Balance at December 31, 2020 $ 235 1,458 $ 26,778 28,471 Additions - - 27 27 Dispositions - - (145) (145) Balance as at December 31, 2021 $ 235 1,458 $ 26,660 28,353 Deferred exploration costs Balance at December 31, 2020 216,350 9,173 20,728 246,251 Additions: General exploration and drilling 6,502 - 3,615 10,117 Environmental, permitting, and engagement 15,154 - 2 15,156 Technical, engineering and design 13,893 - 1 13,894 Geochemistry and assays - - 333 333 Geological and geophysical 116 7 775 898 Labour and wages 4,925 - 815 5,740 Share-based payments (Note 11) 3,696 - 1,561 5,257 Travel 305 - 239 544 Total Additions 44,591 7 7,341 51,939 Balance as at December 31, 2021 $ 260,941 9,180 $ 28,069 298,190 Total costs, December 31, 2021 $ 261,176 10,638 $ 54,729 326,543

PROPERTY AND EQUIPMENT (Tables)

PROPERTY AND EQUIPMENT (Tables)	12 Months Ended
PROPERTY AND EQUIPMENT (Tables)	Dec. 31, 2022
Text block [abstract]
Summary of Detailed Information about Property, Plant and Equipment	Computer Software Field Office, Road Total Cost At December 31, 2020 $ 451 $ 1,060 6,822 $ 5,142 $ 2,079 $ 15,554 Reclassification - - (275) 275 - - Additions 46 295 98 858 - 1,297 Disposals - - - (494) - (494) At December 31, 2021 $ 497 $ 1,355 6,645 $ 5,781 $ 2,079 $ 16,357 Additions 122 4 20 110 - 256 Balance as at December 31, 2022 $ 619 $ 1,359 6,665 $ 5,891 $ 2,079 $ 16,613 Accumulated Depreciation At December 31, 2020 $ 370 $ 841 3,761 $ 1,420 $ 1,583 $ 7,975 Reclassification - - (193) 193 - - Depreciation 57 202 612 885 389 2,145 Disposals - - - (382) - (382) At December 31, 2021 $ 427 $ 1,043 4,180 $ 2,116 $ 1,972 $ 9,738 Depreciation 89 172 523 982 61 1,827 Balance as at December 31, 2022 $ 516 $ 1,215 4,703 $ 3,098 $ 2,033 $ 11,565 Net book value at December 31, 2021 $ 70 $ 312 2,465 $ 3,665 $ 107 $ 6,619 Net book value at December 31, 2022 $ 103 $ 144 1,962 $ 2,793 $ 46 $ 5,048

FLOW-THROUGH SHARE PREMIUM LI_2

FLOW-THROUGH SHARE PREMIUM LIABILITY (Tables)	12 Months Ended
FLOW-THROUGH SHARE PREMIUM LIABILITY (Tables)	Dec. 31, 2022
Text block [abstract]
Summary of Continuity of the Flow-through Share Premium Liability	The flow-through share premium liability for the years ended December 31, is comprised of: 2022 2021 Balance, beginning of year $ - $ - Liability incurred on flow-through shares issued 2,115 - Settlement of flow-though share liability on expenditures (46) - Balance, end of year $ 2,069 $ -

CONVERTIBLE DEBENTURES (Tables)

CONVERTIBLE DEBENTURES (Tables)	12 Months Ended
CONVERTIBLE DEBENTURES (Tables)	Dec. 31, 2022
Statement [LineItems]
Summary of Detailed Information about Convertible Debentures	2016 2017 2020 IsoEnergy IsoEnergy Total Fair value at December 31, 2020 $ 94,768 $ 86,568 $ 31,483 $ 14,034 $ - $ 226,853 Fair value adjustment 30,291 18,674 15,427 11,067 - 75,459 Settlement with shares (125,059) (105,242) - - - (230,301) Fair value at December 31, 2021 $ - $ - $ 46,910 $ 25,101 $ - $ 72,011 Fair value on issuance - - - - 5,296 5,296 Fair value adjustment - - 5,705 (2,832) (159) 2,714 Fair Value at December 31, 2022 $ - $ - $ 52,615 $ 22,269 $ 5,137 $ 80,021
2020 Debentures [member]
Statement [LineItems]
Summary of Detailed Information about Convertible Debentures, Valuation Assumptions	The inputs used in the pricing model as at December 31, 2022 and December 31, 2021 are as follows: December 31, 2022 December 31, 2021 Volatility 46.00% 40.00% Expected life in years 2.41 years 3.41 years Risk free interest rate 4.35% 1.78% Expected dividend yield 0% 0% Credit spread 17.96% 16.88% Underlying share price of the Company $5.99 $5.54 Conversion exercise price $2.34 $2.34 Exchange rate (C$:US$) $0.738 $0.791
ISO Energy Debentures [member]
Statement [LineItems]
Summary of Detailed Information about Convertible Debentures, Valuation Assumptions	The inputs used in the pricing model as at December 31, 2022 and December 31, 2021 are as follows: December 31, 2022 December 31, 2021 Volatility 52.80% 50.00% Expected life in years 2.6 years 3.6 years Risk free interest rate 4.27% 1.78% Expected dividend yield 0% 0% Credit spread 23.85% 21.86% Underlying share price of IsoEnergy $2.91 $3.74 Conversion exercise price $0.88 $0.88 Exchange rate (C$:US$) $0.738 $0.791
2022 IsoEnergy Debentures
Statement [LineItems]
Summary of Detailed Information about Convertible Debentures, Valuation Assumptions	The inputs used in the pricing model as at December 6, 2022 and December 31, 2022 are as follows: December 31, 2022 December 6, 2022 Volatility 52.80% 52.41% Expected life in years 4.9 years 5.0 years Risk free interest rate 3.76% 3.35% Expected dividend yield 0% 0% Credit spread 23.85% 23.91% Underlying share price of IsoEnergy $2.91 $3.10 Conversion exercise price $4.33 $4.33 Exchange rate (C$:US$) $0.738 $0.732

LEASES (Tables)

LEASES (Tables)	12 Months Ended
LEASES (Tables)	Dec. 31, 2022
Presentation of leases for lessee [abstract]
Schedule of Right-of-use asset	(a) Right-of-use December 31, 2022 December 31, 2021 Right-of-use $ 2,640 $ 3,544 Additions - 29 Disposals - (147) Depreciation (707) (786) Balance, end of period $ 1,933 $ 2,640
Schedule of Lease obligation adoption	(b) Lease liabilities December 31, 2022 December 31, 2021 Lease liabilities, beginning of period $ 3,169 $ 4,031 Terminations - (124) Interest expense on lease liabilities 207 265 Payment of lease liabilities (913) (1,003) Balance, end of period $ 2,463 $ 3,169 Current portion 775 706 Non-current 1,688 2,463 Balance, end of period $ 2,463 $ 3,169
Schedule of Minimum future lease payments relating to the leased assets	(c) Amounts relating to short-term and variable leases Year ended December 31, 2022 2021 Expense relating to short-term leases $ 3,205 $ 1,975 Expense relating to variable lease payments $ 417 $ 417

SHARE CAPITAL - (Tables)

SHARE CAPITAL - (Tables)	12 Months Ended
SHARE CAPITAL - (Tables)	Dec. 31, 2022
Text block [abstract]
Summary of Stock Option Transactions and the Number of Stock Options	A summary of the changes in the share options is presented below: Options outstanding Weighted average At December 31, 2020 36,473,162 $ 2.47 Granted 17,400,000 5.61 Exercised (10,020,001) 2.59 Expired (266,666) 2.18 Forfeited (150,001) 5.84 At December 31, 2021 43,436,494 $ 3.69 Granted 9,744,729 5.47 Exercised (3,247,332) 3.08 Expired (65,000) 5.52 Forfeited (230,001) 5.33 At December 31, 2022 – Outstanding 49,638,890 $ 4.07 At December 31, 2022 – Exercisable 37,499,176 $ 3.59
Summary of Company's Stock Options Outstanding and Exercisable	The following table summarizes information about the exercisable share options outstanding as at December 31, 2022: Number of share options outstanding Number of share options exercisable Exercise prices (C$) Remaining contractual life (years) Expiry date 75,000 75,000 2.39 0.28 April 13, 2023 3,450,000 3,450,000 2.85 0.44 June 8, 2023 100,000 100,000 2.66 0.47 June 20, 2023 720,482 720,482 2.49 0.64 August 21, 2023 2,300,000 2,300,000 2.41 1.00 December 31, 2023 500,000 500,000 2.27 1.22 March 21, 2024 250,000 250,000 2.22 1.24 March 27, 2024 3,250,000 3,250,000 1.92 1.45 June 12, 2024 188,679 188,679 1.59 1.63 August 16, 2024 3,533,334 3,533,334 1.59 1.98 December 24, 2024 3,875,000 3,875,000 1.80 2.45 June 12, 2025 4,796,666 4,796,666 3.24 2.95 December 11, 2025 250,000 166,667 5.16 3.13 February 16, 2026 650,000 433,335 4.53 3.25 April 1, 2026 8,900,000 5,933,334 5.84 3.44 June 10, 2026 7,130,000 4,753,346 5.44 3.96 December 14, 2026 94,277 - 5.76 4.05 January 18, 2027 3,565,000 1,188,333 5.31 4.63 August 17, 2027 55,452 - 5.41 4.76 October 4, 2027 5,955,000 1,985,000 5.57 4.97 December 18, 2027 49,638,890 37,499,176 3.59 2.60
Summary of Weighted Average Grant Date Fair Values	The following weighted average assumptions were used for Black-Scholes valuation of the share options granted: For the year ended December 31, 2022 December 31, 2021 Expected stock price volatility 62.38% 60.42% Expected life of options 5.00 years 5.00 years Risk free interest rate 2.87% 1.03% Expected forfeitures 0% 0% Expected dividend yield 0% 0% Weighted average fair value per option granted in period $3.01 $2.88 Weighted average exercise price $5.47 $5.61

SUPPLEMENTAL CASH FLOW INFORM_2

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)	12 Months Ended
SUPPLEMENTAL CASH FLOW INFORMATION (Tables)	Dec. 31, 2022
Text block [abstract]
Summary Of Detailed Information About Non Cash Investing And Financing Activities	a) Schedule of non-cash Year ended December 31 2022 Capitalized share-based payments $ Exploration and evaluation asset expenditures included in accounts payable and accrued liabilities 4,711 5,681 Interest expense included in accounts payable and accrued liabilities 85 79 Share consideration on sale of properties (Note 5) - 3,544

RELATED PARTY TRANSACTIONS (Tab

RELATED PARTY TRANSACTIONS (Tables)	12 Months Ended
RELATED PARTY TRANSACTIONS (Tables)	Dec. 31, 2022
Text block [abstract]
Disclosure of Information About Key Management Personnel	The remuneration of key management which includes directors and management personnel responsible for planning, directing, and controlling the activities of the Company during the period was as follows: For the year ended December 31 2022 Short-term compensation (1) $ $ Share-based payments (2) 32,210 29,231 Consulting fees (3) (4) 231 212 $ $ (1) (2) Share-based payments to key management personnel for the year ended December 31, 2022 amounted to $ (2021 - $ ) of which $ (2021 - $ ) was expensed and $ (2021 - $ ) was capitalized to exploration and evaluation assets. (3) (4) As at December 31, 2022, there was $ (December 31, 2021 - $ ) included in accounts payable and accrued liabilities owing to its directors and officers for compensation.

CAPITAL MANAGEMENT (Tables)

CAPITAL MANAGEMENT (Tables)	12 Months Ended
CAPITAL MANAGEMENT (Tables)	Dec. 31, 2022
Text block [abstract]
Disclosure Of Detailed Information About Management Capital Explanatory	Capital, as defined above, is summarized in the following table: December 31, 2022 December 31, 2021 Equity $ $ Convertible debentures (Note 9) 80,021 72,011 535,438 533,359 Less: Cash (134,447) (201,804) $ $

FINANCIAL INSTRUMENTS AND RIS_2

FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Tables)	12 Months Ended
FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Tables)	Dec. 31, 2022
Text block [abstract]
Summary Of Maximum Exposure To Credit Risk	The Company’s maximum exposure to credit risk is as follows: December 31, 2022 December 31, 2021 Cash $ 134,447 $ 201,804 Amounts receivable 1,801 1,178 $ 136,248 $ 202,982
Summary Of Detailed Information About Siginificant Undiscounted Commitments	The Company’s significant undiscounted commitments at December 31, 2022 are as follows: Less than 1 year 1 to 3 years 4 to 5 years Over 5 years Total Trade and other payables $ $ $ $ - $ 13,723 Convertible debentures (Note 9) - 74,884 5,137 - 80,021 Lease liabilities (Note 10) 1,346 2,574 - - 3,920 $ $ $ $ - $

NON-CONTROLLING INTERESTS (Tabl

NON-CONTROLLING INTERESTS (Tables)	12 Months Ended
NON-CONTROLLING INTERESTS (Tables)	Dec. 31, 2022
Text block [abstract]
Summary of Financial Information for IsoEnergy Ltd	Summarized financial information for IsoEnergy Ltd. is as follows: 2022 2021 Cash $ 19,913 $ 13,617 Other current assets 212 236 Marketable securities 5,775 9,315 Non-current 71,215 61,022 Total assets $ $ Current liabilities 2,622 641 Non-current 28,273 27,636 Total liabilities $ 30,895 $ 28,277 Loss from operations $ 7,375 $ 15,781 Loss and comprehensive loss $ 10,368 $ 10,819 Net cash flow from operating activities (2,766) (2,751) Net cash flow from investing activities (8,694) (5,336) Net cash flow from financing activities 17,756 7,669 Net increase (decrease) in cash $ 6,296 $ (418)

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
INCOME TAXES (Tables)	Dec. 31, 2022
Text block [abstract]
Summary of Income Tax (Recovery) Expense	The Company’s income tax expense is comprised of the following: 2022 2021 Deferred income tax expense (recovery) $ (1,042) $ 1,122 Total $ (1,042) $ 1,122
Disclosure Of Change In Fair Value of Convertible Debentures Attributable To Credit Risk Fluctuation	The Company’s deferred tax items recognized in OCI during the year: 2022 2021 Change in fair value of convertible debentures attributable to the change in credit risk $ 17 $ (79) Change in fair value of marketable securities (478) 780 Total $ $ 701
Summary of Deferred Tax (Assets) and Liabilities	The tax effects of temporary differences between amounts recorded in the Company’s accounts and the corresponding amounts as calculated for income tax purposes give rise to the following deferred tax (assets) and liabilities: 2022 2021 Exploration and evaluation assets $ 39,120 $ 26,258 Convertible debentures 66 241 Non-capital (38,333) (24,501) Share issuance costs (208) (168) Equipment (79) (74) Marketable securities 301 780 Net deferred tax liabilities $ 867 $ 2,536
Summary of Movement in Deferred Tax Liability	Movement in the Company’s deferred tax liability balance in the year is as follows: 2022 2021 Opening balance $ $ 712 Recognized in income tax expense (996) 1,122 Recognized in OCI/equity (673) 702 Net deferred tax liabilities $ 867 $
Significant Components of Temporary Differences, Unused Tax Credits and Unused Tax Losses	The significant components of the Company’s temporary differences, unused tax credits and unused tax losses that have not been included on the consolidated statement of financial position are as follows: Temporary Differences 2022 Expiry Date Range 2021 Expiry Date Range Non-capital $ 144,633 2029 to 2042 $ 121,471 2029 to 2041 Share issuance costs 7,156 - 9,672 - Equipment 911 - 765 - Donations 153 2023 to 2027 133 2022 to 2026

Reporting Entity - Additional I

Reporting Entity - Additional Information (Detail)	12 Months Ended
Reporting Entity - Additional Information (Detail)	Dec. 31, 2022	Dec. 31, 2021
IsoEnergy Ltd. [member]
Disclosure of reporting entity [line items]
Proportion of ownership interest in subsidiary	50.10%	50.50%

Nature of Operations - Addition

Nature of Operations - Additional Information (Detail) - CAD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Nature of operations [abstract]
Accumulated deficit	$ (389,867)	$ (332,980)
Working capital	$ 127,621

Significant Accounting Polici_4

Significant Accounting Policies - Summary of Company's Ownership Percentage in Each of Its Subsidiaries (Detail)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
NXE Energy Royalty Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100%	100%
NXE Energy SW1 Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100%	100%
NXE Energy SW3 Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100%	100%
IsoEnergy Ltd. [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	50.10%	50.50%

Significant Accounting Polici_5

Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022
Disclosure of significant accounting policies [line items]
Flow through shares expended on property exploration period	two years

Significant Accounting Polici_6

Significant Accounting Policies - Summary of Depreciation Over the Estimated Useful Lives of Each Significant Component (Detail)	12 Months Ended
	Dec. 31, 2022
Lease right-of-use assets
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives or depreciation rates	Lease term straight-line basis
Computing Equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives or depreciation rates	55%
Useful lives or amortisation rates, intangible assets other than goodwill	55% declining balance basis
Software [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives or amortisation rates	55%
Useful lives or amortisation rates, intangible assets other than goodwill	55% declining balance basis
Field Equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives or depreciation rates	20%
Estimated useful lives or depreciation rates	20% declining balance basis
Leasehold Improvements [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives or depreciation rates	Lease term straight-line basis
Road [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives or depreciation, straight-line basis	5 years
Estimated useful lives or depreciation rates	5-year straight-line basis
Vehicles [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives or depreciation, straight-line basis	2 years
Estimated useful lives or depreciation rates	2-year straight-line basis

Significant Accounting Polici_7

Significant Accounting Policies - Schedule Of Accounting Policy For Financial Instruments (Detail)	12 Months Ended
	Dec. 31, 2022
Financial assets at amortised cost, category [member]
Disclosure of detailed information about financial instruments [line items]
Financial instruments, classified under IFRS 9	Amortized cost
Amounts receivables [Member] \| Financial assets at amortised cost, category [member]
Disclosure of detailed information about financial instruments [line items]
Financial instruments, classified under IFRS 9	Amortized cost
Accounts Payable And Accrued Liabilitites [Member] \| Financial assets at amortised cost, category [member]
Disclosure of detailed information about financial instruments [line items]
Financial instruments, classified under IFRS 9	Amortized cost
Convertible debentures [member] \| Financial liabilities at fair value through profit or loss, category [member]
Disclosure of detailed information about financial instruments [line items]
Financial instruments, classified under IFRS 9	FVTPL
Marketable Securities [Member] \| Financial assets measured at fair value through other comprehensive income, category
Disclosure of detailed information about financial instruments [line items]
Financial instruments, classified under IFRS 9	FVTOCI

Marketable Securities - Summary

Marketable Securities - Summary of Detailed Information about Disposal of Marketable Securities (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Marketable Securities [line Items]
Cash	$ 0	$ 192
Gain on sale of assets	$ (85)	3,595
Clover, Gemini and Tower uranium properties [Member]
Disclosure Of Marketable Securities [line Items]
Marketable securities received		2,068
Cash		192
Proceeds – disposition of properties		2,260
Cost – disposition of properties		(35)
Gain on sale of assets		2,225
Mountain Lake property [Member]
Disclosure Of Marketable Securities [line Items]
Marketable securities received		1,476
Cash		20
Proceeds – disposition of properties		1,496
Cost – disposition of properties		(126)
Gain on sale of assets		$ 1,370

Marketable Securities - Summa_2

Marketable Securities - Summary of Detailed Information about Disposal of Marketable Securities (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 CAD ($)
Clover, Gemini and Tower uranium properties [Member]
Statement1 [Line Items]
Cost of disposition properties	$ 35
Gain on sale of assets	2,225
Mountain Lake property [Member]
Statement1 [Line Items]
Cost of disposition properties	126
Gain on sale of assets	$ 1,370

Marketable Securities - Additio

Marketable Securities - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands		1 Months Ended			12 Months Ended
	Feb. 22, 2022 shares	Aug. 31, 2021 CAD ($) $ / shares shares	Apr. 30, 2021 CAD ($) shares	Apr. 30, 2021 AUD ($) $ / shares shares	Dec. 31, 2022 CAD ($) shares	Dec. 31, 2021 CAD ($)
Disclosure Of Marketable Securities [line Items]
Cash received on sale of marketable securities					$ 0	$ 192
Sale of stock received price per share \| $ / shares		$ 1.64
Net Smelter Return Percentage					2%
Marketable securities					$ 5,775	9,315
International Consolidated Uranium Inc [Member]
Disclosure Of Marketable Securities [line Items]
Number of shares valuation \| shares					900,000
Number of shares to be issued to spinout entity for each share held by consolidated entity pm prorata allotment \| shares	0.214778
92 Energy [Member]
Disclosure Of Marketable Securities [line Items]
Number of shares valuation \| shares					10,755,000
Labrador Uranium [Member]
Disclosure Of Marketable Securities [line Items]
Number of shares valuation \| shares					193,300
Clover, Gemini and Tower Uranium Properties [Member]
Disclosure Of Marketable Securities [line Items]
Cash received on sale of marketable securities						192
Mountain Lake Property [member]
Disclosure Of Marketable Securities [line Items]
Cash received on sale of marketable securities						20
Expiration term of contingent payments		10 years
Mountain Lake Property [member] \| Metal Price Per Pound Fifty [Member]
Disclosure Of Marketable Securities [line Items]
Additional cash received from sale of properties		$ 410
Mountain Lake Property [member] \| Metal Price Per Pound Seventy Five [Member]
Disclosure Of Marketable Securities [line Items]
Additional cash received from sale of properties		615
Mountain Lake Property [member] \| Metal Price Per Pound Hundred [Member]
Disclosure Of Marketable Securities [line Items]
Additional cash received from sale of properties		$ 820
Mountain Lake Property [member] \| International Consolidated Uranium Inc [Member]
Disclosure Of Marketable Securities [line Items]
Stock shares received during the period shares \| shares		900,000
Stock shares received during the period value		$ 1,476			$ 1,458	2,583
Cash proceeds on sale of property plant and equipment		20
Mountain Lake Property [member] \| 92 Energy [Member]
Disclosure Of Marketable Securities [line Items]
Stock shares held during the period value					4,253	6,732
Gain on mark to mark valuation of shares					3,540	5,772
Mountain Lake Property [member] \| Labrador Uranium [Member]
Disclosure Of Marketable Securities [line Items]
Stock shares held during the period value					$ 64	$ 0
Iso Energy [Member]
Disclosure Of Marketable Securities [line Items]
Additional Cash Consideration Payable		$ 1,000
Iso Energy [Member] \| International Consolidated Uranium Inc [Member]
Disclosure Of Marketable Securities [line Items]
Number of shares received by spinout entity \| shares	193,300
Iso Energy [Member] \| Clover, Gemini and Tower Uranium Properties [Member]
Disclosure Of Marketable Securities [line Items]
Cash received on sale of marketable securities			$ 192	$ 200
Stock shares received during the period shares \| shares			10,755,000	10,755,000
Stock shares received during the period value			$ 2,068	$ 2,151
Sale of stock received price per share \| $ / shares				$ 0.2

Exploration and Evaluation As_3

Exploration and Evaluation Assets - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2022 CAD ($) ha Claims
Disclosure of exploration and expenditure assets [line items]
Ownership percentage of mineral property	100%
Rook I Property [member]
Disclosure of exploration and expenditure assets [line items]
Number of mineral claims \| Claims	32
Size of mineral property	35,065
Ownership percentage of mineral property	100%
Description about net smelter return royalty	The NSR may be reduced to 1% upon payment of $1 million.
IsoEnergy Ltd. [member] \| Evergreen Property [member]
Disclosure of exploration and expenditure assets [line items]
Size of mineral property	35,362
Ownership percentage of mineral property	100%
IsoEnergy Ltd. [member] \| Radio Project [member]
Disclosure of exploration and expenditure assets [line items]
Ownership percentage of mineral property	100%
Net smelter return royalty	2%
Description about net smelter return royalty	subject to a 2% NSR and 2% gross overriding royalty
Gross overriding royalty	2%
IsoEnergy Ltd. [member] \| Thorburn Lake Project [member]
Disclosure of exploration and expenditure assets [line items]
Ownership percentage of mineral property	100%
Net smelter return royalty	1%
Production carried interest	10%
Description about net smelter return royalty	subject to a 1% NSR and a 10% carried interest which can be converted to a 1% NSR at the holder’s option upon completion of a bankable feasibility study
Reduction percentage in holders option completion	1%
IsoEnergy Ltd. [member] \| Madison, 2Z, Carlson Creek and North Thorburn Properties [member]
Disclosure of exploration and expenditure assets [line items]
Ownership percentage of mineral property	100%
IsoEnergy Ltd. [member] \| Geiger Property [member]
Disclosure of exploration and expenditure assets [line items]
Ownership percentage of mineral property	100%
IsoEnergy Ltd. [member] \| Larocque East Property [member]
Disclosure of exploration and expenditure assets [line items]
Size of mineral property	18,980
Ownership percentage of mineral property	100%
S-113928 to S-113933 [member] \| Rook I Property [member]
Disclosure of exploration and expenditure assets [line items]
Net smelter return royalty	2%
Production carried interest	10%
Percentage decrease in return royalty	1%
Amount paid upon reduction of return royalty \| $	$ 1

Exploration and Evaluation As_4

Exploration and Evaluation Assets - Summary of Capitalized Costs on Projects (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	$ 326,543
Exploration and evaluation assets, ending balance	405,248	$ 326,543
Acquisition cost [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	28,353	28,471
Additions	10	27
Dispositions	(42)	(145)
Exploration and evaluation assets, ending balance	28,321	28,353
Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	298,190	246,251
Expense arising from exploration for and evaluation of mineral resources	78,737	51,939
Exploration and evaluation assets, ending balance	376,927	298,190
Rook 1 Property [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	261,176
Exploration and evaluation assets, ending balance	329,247	261,176
Rook 1 Property [member] \| Acquisition cost [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	235	235
Additions	0	0
Dispositions	0	0
Exploration and evaluation assets, ending balance	235	235
Rook 1 Property [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	260,941	216,350
Expense arising from exploration for and evaluation of mineral resources	68,071	44,591
Exploration and evaluation assets, ending balance	329,012	260,941
Other Athabasca Basin Properties [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	10,638
Exploration and evaluation assets, ending balance	11,061	10,638
Other Athabasca Basin Properties [member] \| Acquisition cost [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	1,458	1,458
Additions	0	0
Dispositions	0	0
Exploration and evaluation assets, ending balance	1,458	1,458
Other Athabasca Basin Properties [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	9,180	9,173
Expense arising from exploration for and evaluation of mineral resources	423	7
Exploration and evaluation assets, ending balance	9,603	9,180
General exploration and drilling [Member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	13,318	10,117
General exploration and drilling [Member] \| Rook 1 Property [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	7,705	6,502
General exploration and drilling [Member] \| Other Athabasca Basin Properties [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	0	0
Environmental, permitting, and engagement [Member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	12,005	15,156
Environmental, permitting, and engagement [Member] \| Rook 1 Property [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	12,005	15,154
Environmental, permitting, and engagement [Member] \| Other Athabasca Basin Properties [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	0	0
Technical, engineering and design [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	32,703	13,894
Technical, engineering and design [member] \| Rook 1 Property [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	32,703	13,893
Technical, engineering and design [member] \| Other Athabasca Basin Properties [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	0	0
Geochemistry and assays [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	190	333
Geochemistry and assays [member] \| Rook 1 Property [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	0	0
Geochemistry and assays [member] \| Other Athabasca Basin Properties [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	0	0
Geological and Geophysical [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	3,957	898
Geological and Geophysical [member] \| Rook 1 Property [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	1,941	116
Geological and Geophysical [member] \| Other Athabasca Basin Properties [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	423	7
Labour and Wages [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	9,654	5,740
Labour and Wages [member] \| Rook 1 Property [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	8,818	4,925
Labour and Wages [member] \| Other Athabasca Basin Properties [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	0	0
Share-based Payments [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	6,364	5,257
Share-based Payments [member] \| Rook 1 Property [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	4,532	3,696
Share-based Payments [member] \| Other Athabasca Basin Properties [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	0	0
Travel [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	545	544
Travel [member] \| Rook 1 Property [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	367	305
Travel [member] \| Other Athabasca Basin Properties [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	0	0
IsoEnergy Ltd. [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	54,729
Exploration and evaluation assets, ending balance	64,940	54,729
IsoEnergy Ltd. [member] \| Acquisition cost [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	26,660	26,778
Additions	10	27
Dispositions	(42)	(145)
Exploration and evaluation assets, ending balance	26,628	26,660
IsoEnergy Ltd. [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	28,069	20,728
Expense arising from exploration for and evaluation of mineral resources	10,243	7,341
Exploration and evaluation assets, ending balance	38,312	28,069
IsoEnergy Ltd. [member] \| General exploration and drilling [Member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	5,613	3,615
IsoEnergy Ltd. [member] \| Environmental, permitting, and engagement [Member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	0	2
IsoEnergy Ltd. [member] \| Technical, engineering and design [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	0	1
IsoEnergy Ltd. [member] \| Geochemistry and assays [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	190	333
IsoEnergy Ltd. [member] \| Geological and Geophysical [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	1,593	775
IsoEnergy Ltd. [member] \| Labour and Wages [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	836	815
IsoEnergy Ltd. [member] \| Share-based Payments [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	1,832	1,561
IsoEnergy Ltd. [member] \| Travel [member] \| Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Expense arising from exploration for and evaluation of mineral resources	$ 178	$ 239

Property and Equipment - Summar

Property and Equipment - Summary of Detailed Information about Property, Plant and Equipment (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	$ 6,619
Balance at end of year	5,048	$ 6,619
At Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	16,357	15,554
Additions	256	1,297
Disposals		(494)
Balance at end of year	16,613	16,357
Accumulated Depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	9,738	7,975
Depreciation	1,827	2,145
Disposals		(382)
Balance at end of year	11,565	9,738
Software [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	312
Balance at end of year	144	312
Software [member] \| At Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	1,355	1,060
Additions	4	295
Balance at end of year	1,359	1,355
Software [member] \| Accumulated Depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	1,043	841
Depreciation	172	202
Balance at end of year	1,215	1,043
Computer Equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	70
Balance at end of year	103	70
Computer Equipment [member] \| At Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	497	451
Additions	122	46
Balance at end of year	619	497
Computer Equipment [member] \| Accumulated Depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	427	370
Depreciation	89	57
Balance at end of year	516	427
Field Equipment and Vehicles [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	2,465
Balance at end of year	1,962	2,465
Field Equipment and Vehicles [member] \| At Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	6,645	6,822
Reclassification		(275)
Additions	20	98
Disposals		0
Balance at end of year	6,665	6,645
Field Equipment and Vehicles [member] \| Accumulated Depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	4,180	3,761
Reclassification		(193)
Depreciation	523	612
Balance at end of year	4,703	4,180
Office Furniture and Leasehold Improvements [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	3,665
Balance at end of year	2,793	3,665
Office Furniture and Leasehold Improvements [Member] \| At Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	5,781	5,142
Reclassification		275
Additions	110	858
Disposals		(494)
Balance at end of year	5,891	5,781
Office Furniture and Leasehold Improvements [Member] \| Accumulated Depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	2,116	1,420
Reclassification		193
Depreciation	982	885
Disposals		(382)
Balance at end of year	3,098	2,116
Road [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	107
Balance at end of year	46	107
Road [member] \| At Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	2,079	2,079
Balance at end of year	2,079	2,079
Road [member] \| Accumulated Depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	1,972	1,583
Depreciation	61	389
Balance at end of year	$ 2,033	$ 1,972

Flow-through share premium li_3

Flow-through share premium liability - Additional Information (Detail) $ in Thousands	Dec. 31, 2022 CAD ($)
IsoEnergy Ltd. [member]
Commitments [line items]
Required exploration expenditures	$ 4,919

Flow-through share premium li_4

Flow-through share premium liability - Summary of Continuity of the Flow-through Share Premium Liability (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
FLOWTHROUGH SHARE PREMIUM LIABILITY [Abstract]
Balance, beginning of the year	$ 0	$ 0
Liability incurred on flow-through shares issued	2,115	0
Settlement of flow-though share liability on expenditures	(46)	0
Balance, end of the year	$ 2,069	$ 0

Convertible Debentures - Summar

Convertible Debentures - Summary of Detailed Information about Convertible Debentures (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Convertible debentures [line items]
Beginning	$ 72,011	$ 226,853
Fair value on issuance	5,296
Fair value adjustment	2,714	75,459
Settlement with shares		(230,301)
Ending	80,021	72,011
2016 Debentures [member]
Convertible debentures [line items]
Beginning		94,768
Fair value adjustment		30,291
Settlement with shares		(125,059)
2017 Debentures [member]
Convertible debentures [line items]
Beginning		86,568
Fair value adjustment		18,674
Settlement with shares		(105,242)
2020 Debentures [member]
Convertible debentures [line items]
Beginning	46,910	31,483
Fair value adjustment	5,705	15,427
Ending	52,615	46,910
2020 IsoEnergy Debentures
Convertible debentures [line items]
Beginning	25,101	14,034
Fair value adjustment	(2,832)	11,067
Ending	22,269	$ 25,101
2022 IsoEnergy Debentures
Convertible debentures [line items]
Fair value on issuance	5,296
Fair value adjustment	(159)
Ending	$ 5,137

Convertible Debentures - Additi

Convertible Debentures - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands														12 Months Ended
	Dec. 09, 2022 CAD ($) shares	Dec. 06, 2022 CAD ($) $ / shares shares	Dec. 06, 2022 USD ($)	Jun. 10, 2022 CAD ($) shares	Dec. 10, 2021 CAD ($) shares	Jun. 10, 2021 CAD ($) shares	Feb. 23, 2021 CAD ($) shares	Feb. 18, 2021 CAD ($) shares	Feb. 03, 2021 CAD ($) shares	Aug. 18, 2020 CAD ($) shares	Aug. 18, 2020 USD ($) shares	May 27, 2020 CAD ($) shares	May 27, 2020 USD ($) shares	Dec. 31, 2022 CAD ($) $ / shares shares	Dec. 31, 2021 CAD ($) $ / shares	Dec. 06, 2022 USD ($) shares	Feb. 23, 2021 $ / shares	Feb. 18, 2021 $ / shares	Aug. 18, 2020 $ / shares
Convertible debentures [line items]
Mark-to-market loss on convertible debentures (Note 9)														$ (2,863)	$ (75,123)
Interest rate														10%
Sale of stock issue price per share \| shares							22,289,088	25,794,247
Stock issued during period shares \| shares	42,328			42,252	36,818	40,829			200,000
Stock issued during value	$ 235			$ 251	$ 202	$ 238			$ 900					$ 486	$ 1,289
2016 Debentures [member]
Convertible debentures [line items]
Stock issued during period related to accrued and unpaid interest \| shares							89,729	89,729
Stock issued during period value related to accrued and unpaid interest								$ 407
Closing share price \| $ / shares																		$ 4.69
Convertible debt, conversion price \| $ / shares																	$ 2.33
2017 Debentures [member]
Convertible debentures [line items]
Stock issued during period related to accrued and unpaid interest \| shares							87,316
Stock issued during period value related to accrued and unpaid interest							$ 442
Closing share price \| $ / shares																		$ 4.88
Convertible debt, conversion price \| $ / shares																	$ 2.69
2020 Debentures [member]
Convertible debentures [line items]
Gross proceeds from issuance of convertible debentures												$ 20,889	$ 15,000
Establishment fee, percent												3%	3%
Establishment fee												$ 627	$ 450
Establishment fee (shares) \| shares												348,350	348,350
Interest rate												7.50%	7.50%
Borrowings, interest rate, payable in cash												5%	5%
Borrowings, interest rate, payable in common shares												2.50%	2.50%
Fair value on the issue date												$ 20,262	$ 14,550
Convertible debentures term														2.41 years	3.41 years
Stock issued during period shares \| shares												84,580	84,580
Stock issued during value												$ 486
Interest expense on bonds												985	$ 750
Convertible debt, conversion price \| $ / shares														$ 2.34	$ 2.34
2020 Debentures [member] \| Convertible Debenture Consent Fee [member]
Convertible debentures [line items]
Issue of equity												$ 355
Sale of stock issue price per share \| shares												180,270	180,270
2017 Debentures [member]
Convertible debentures [line items]
Comprehensive income (loss)														$ 149	$ 336
Debentures increased														80,021	72,011
Gains (losses) recognised in profit or loss, fair value measurement, liabilities														2,863	75,123
Mark-to-market loss on convertible debentures (Note 9)														2,714	75,459
Interest expense on convertible debentures														$ 2,179	$ 3,729
2016 and 2017 Debentures [member]
Convertible debentures [line items]
Gross proceeds from issuance of convertible debentures							$ 105,242	125,059
Debentures increased								$ 60
Interest rate															7.50%
Convertible debentures term														July 22, 2022
Sale of stock issue price per share \| shares							22,289,088	25,794,247
Stock issued during period value related to accrued and unpaid interest							$ 849
Loss on conversion reclassified to accumulated deficit							$ 4,016
2020 IsoEnergy Debentures
Convertible debentures [line items]
Gross proceeds from issuance of convertible debentures										$ 7,902	$ 6,000
Establishment fee, percent										3%	3%
Establishment fee										$ 272	$ 180
Establishment fee (shares) \| shares										219,689	219,689
Fair value on the issue date										$ 7,630	$ 5,820
Convertible debentures face value											$ 6,000
Convetible debentures conversion price per share \| $ / shares																			$ 0.88
Number of common shares issuable upon conversion of debentures. \| shares											9,206,311
Convertible debentures term														2.6 years	3.6 years
Interest expense														$ 670
Interest payment settled In cash														$ 476
Convertible debt, conversion price \| $ / shares														$ 0.88	$ 0.88
2020 IsoEnergy Debentures \| Queens Road Capital Investment Limited [Member]
Convertible debentures [line items]
Stock issued during period shares \| shares														63,890
2022 IsoEnergy Debentures
Convertible debentures [line items]
Gross proceeds from issuance of convertible debentures		$ 5,460	$ 4,000
Establishment fee, percent		3%	3%
Establishment fee		$ 164	$ 120
Debentures increased		$ 5,296														$ 3,880
Convertible debentures face value																$ 4,000
Convetible debentures conversion price per share \| $ / shares		$ 4.33
Number of common shares issuable upon conversion of debentures. \| shares		1,464,281														1,464,281
Convertible debentures term		5.0 years	5.0 years											4.9 years
Stock issued during period shares \| shares														3,168
Interest expense														$ 38
Interest payment settled In cash														$ 28
Convertible debt, conversion price \| $ / shares		$ 4.33												$ 4.33

Convertible Debentures - Summ_2

Convertible Debentures - Summary of Detailed Information about Convertible Debentures, Valuation Assumptions (Detail)		12 Months Ended
	Dec. 06, 2022 CAD ($) $ / shares	Dec. 31, 2022 CAD ($) $ / shares	Dec. 31, 2021 CAD ($) $ / shares
2020 Debentures [member]
Convertible debentures [line items]
Volatility		46%	40%
Expected life in years		2.41 years	3.41 years
Risk free interest rate		4.35%	1.78%
Expected dividend yield		0%	0%
Credit spread		17.96%	16.88%
Underlying share price of the Company \| $		5.99	5.54
Conversion exercise price \| $ / shares		$ 2.34	$ 2.34
Exchange rate (C$:US$)		0.738	0.791
2020 IsoEnergy Debentures
Convertible debentures [line items]
Volatility		52.80%	50%
Expected life in years		2.6 years	3.6 years
Risk free interest rate		4.27%	1.78%
Expected dividend yield		0%	0%
Credit spread		23.85%	21.86%
Underlying share price of the Company \| $		2.91	3.74
Conversion exercise price \| $ / shares		$ 0.88	$ 0.88
Exchange rate (C$:US$)		0.738	0.791
2022 IsoEnergy Debentures
Convertible debentures [line items]
Volatility	52.41%	52.80%
Expected life in years	5.0 years	4.9 years
Risk free interest rate	3.35%	3.76%
Expected dividend yield	0%	0%
Credit spread	23.91%	23.85%
Underlying share price of the Company \| $	3.1	2.91
Conversion exercise price \| $ / shares	$ 4.33	$ 4.33
Exchange rate (C$:US$)	0.732	0.738

Leases - Schedule of Right-of-u

Leases - Schedule of Right-of-use asset (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of quantitative information about right-of-use assets [line items]
Right-of-use assets, beginning of period	$ 2,640	$ 3,544
Additions	0	29
Disposals	0	(147)
Depreciation	(707)	(786)
Balance, end of period	$ 1,933	$ 2,640

Leases - Schedule of Lease obli

Leases - Schedule of Lease obligation adoption (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Detailed Information About Lease Liabilities [Line Items]
Lease liabilities, beginning of period	$ 3,169	$ 4,031
Terminations	0	(124)
Interest expense on lease liabilities	207	265
Payment of lease liabilities	(913)	(1,003)
Balance, end of period	2,463	3,169
Current portion	775	706
Non-current portion	$ 1,688	$ 2,463

Leases - Additional Information

Leases - Additional Information (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement [LineItems]
Payment of short term lease expenses	$ 3,205	$ 1,975
Right-of-use assets	1,933	2,640	$ 3,544
Undiscounted operating lease payments	3,920	5,268
Vehicles [member]
Statement [LineItems]
Right-of-use assets	0	1
Corporate Office Leases [Member]
Statement [LineItems]
Right-of-use assets	$ 1,933	$ 2,639

Leases - Summary of Amounts rec

Leases - Summary of Amounts recognized in consolidated statements of net loss (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Presentation of leases for lessee [abstract]
Expense relating to short-term leases	$ 3,205	$ 1,975
Expense relating to variable lease payments	$ 417	$ 417

Share Capital - Additional Info

Share Capital - Additional Information (Detail) $ / shares in Units, $ in Thousands											12 Months Ended
	Dec. 09, 2022 CAD ($) shares	Jun. 10, 2022 CAD ($) shares	Dec. 10, 2021 CAD ($) shares	Jun. 30, 2021 CAD ($)	Jun. 10, 2021 CAD ($) shares	Mar. 16, 2021 CAD ($) shares	Mar. 11, 2021 CAD ($) $ / shares shares	Feb. 23, 2021 CAD ($) shares	Feb. 18, 2021 CAD ($) shares	Feb. 03, 2021 CAD ($) shares	Dec. 31, 2022 CAD ($) shares	Dec. 31, 2021 CAD ($) shares	Jun. 30, 2021 $ / shares shares
Disclosure of classes of share capital [line items]
Stock Issued During Period, Shares, Stock Options Exercised \| shares												10,020,001
Proceeds from exercise of options												$ 25,962
Common shares issued \| shares													400,000
Proceeds from issue of stock				$ 2,074
Options exercised, shares \| shares											3,247,332
Exercise of options											$ (10,001)	(25,962)
Common shares issued \| shares	42,328	42,252	36,818		40,829					200,000
Issue of shares on convertible debenture interest payment	$ 235	$ 251	$ 202		$ 238					$ 900	486	$ 1,289
Percentage of issued and outstanding shares acquired												20%
Options granted, maximum term												10 years
Share-based payments (Note 11)											35,146	$ 31,389
Sale of stock issue price per share \| $ / shares													$ 5.6
Sale of stock issue price per share \| shares								22,289,088	25,794,247
Share issuance costs				$ 1,035
Initial Public Offering [Member]
Disclosure of classes of share capital [line items]
Sale of stock issue price per share \| $ / shares							$ 4.5
Stock issued during period value through bought deal financing							$ 150,300
Stock issued during period through bought deal financing \| shares							33,400,000
Overallotment [Member]
Disclosure of classes of share capital [line items]
Stock issued during period value through bought deal financing						$ 22,545
Stock issued during period through bought deal financing \| shares						5,010,000
Share issuance costs						$ 9,555
2016 and 2017 Debentures [member]
Disclosure of classes of share capital [line items]
Sale of stock issue price per share \| shares								22,289,088	25,794,247
Gross proceeds from issuance of convertible debentures								$ 105,242	$ 125,059
Stock issued during period value related to accrued and unpaid interest								$ 849
2016 Debentures [member]
Disclosure of classes of share capital [line items]
Stock issued during period related to accrued and unpaid interest \| shares								89,729	89,729
Stock issued during period value related to accrued and unpaid interest									$ 407
2017 Debentures [member]
Disclosure of classes of share capital [line items]
Stock issued during period related to accrued and unpaid interest \| shares								87,316
Stock issued during period value related to accrued and unpaid interest								$ 442
Included in exploration and evaluation assets [member]
Disclosure of classes of share capital [line items]
Capitalized to exploration and evaluation assets											6,364	5,257
Expensed to the statement of loss profit and comprehensive loss profit [member]
Disclosure of classes of share capital [line items]
Share-based payments (Note 11)											35,146	31,389
Reserves [member]
Disclosure of classes of share capital [line items]
Exercise of options											6,260	17,122
Expense from equity settled share based payment transactions											$ 41,510	$ 36,646

Share Capital - Summary of Stoc

Share Capital - Summary of Stock Option Transactions and the Number of Stock Options (Detail)	12 Months Ended
	Dec. 31, 2022 $ / shares	Dec. 31, 2021 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Number of Stock Options Outstanding, Beginning Balance	43,436,494	36,473,162
Number of Stock Options, Granted	9,744,729	17,400,000
Number of Stock Options, Exercised	(3,247,332)	(10,020,001)
Number of Stock Options, Expired	(65,000)	(266,666)
Number of Stock Options, Forfeited	(230,001)	(150,001)
Number of Stock Options Outstanding, Ending Balance	49,638,890	43,436,494
Number of Stock Options Outstanding, Number of options exercisable	37,499,176
Weighted Average Exercise Price Outstanding, Beginning Balance	$ 3.69	$ 2.47
Weighted Average Exercise Price, Granted	5.47	5.61
Weighted Average Exercise Price, Exercised	3.08	2.59
Weighted Average Exercise Price, Expired	5.52	2.18
Weighted Average Exercise Price, Forfeited	5.33	5.84
Weighted Average Exercise Price Outstanding, Ending Balance	4.07	$ 3.69
Weighted Average Exercise Price Outstanding, Number of options exercisable	$ 3.59

Share Capital - Summary of Comp

Share Capital - Summary of Company's Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
	Dec. 31, 2022 $ / shares	Dec. 31, 2021 $ / shares	Dec. 31, 2020 $ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	49,638,890	43,436,494	36,473,162
Number of share options exercisable	37,499,176
Exercise Price	$ 4.07	$ 3.69	$ 2.47
Exercise Price	$ 3.59
Remaining Contractual Life	2 years 7 months 6 days
2.39 Exercise Price Expire on April 13, 2023 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	75,000
Number of share options exercisable	75,000
Exercise Price	$ 2.39
Remaining Contractual Life	3 months 10 days
Expiry Date	Apr. 13, 2023
2.85 Exercise Price Expire on June 8, 2023 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	3,450,000
Number of share options exercisable	3,450,000
Exercise Price	$ 2.85
Remaining Contractual Life	5 months 8 days
Expiry Date	Jun. 08, 2023
2.66 Exercise Price Expire on June 20, 2023 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	100,000
Number of share options exercisable	100,000
Exercise Price	$ 2.66
Remaining Contractual Life	5 months 19 days
Expiry Date	Jun. 20, 2023
2.49 Exercise Price Expire on August21, 2023 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	720,482
Number of share options exercisable	720,482
Exercise Price	$ 2.49
Remaining Contractual Life	7 months 20 days
Expiry Date	Aug. 21, 2023
2.41 Exercise Price Expire on December31, 2023 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	2,300,000
Number of share options exercisable	2,300,000
Exercise Price	$ 2.41
Remaining Contractual Life	1 year
Expiry Date	Dec. 31, 2023
2.27 Exercise Price Expire on March 21, 2024 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	500,000
Number of share options exercisable	500,000
Exercise Price	$ 2.27
Remaining Contractual Life	1 year 2 months 19 days
Expiry Date	Mar. 21, 2024
2.22 Exercise Price Expire on March 27, 2024 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	250,000
Number of share options exercisable	250,000
Exercise Price	$ 2.22
Remaining Contractual Life	1 year 2 months 26 days
Expiry Date	Mar. 27, 2024
1.92 Exercise Price Expire on June 12, 2024 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	3,250,000
Number of share options exercisable	3,250,000
Exercise Price	$ 1.92
Remaining Contractual Life	1 year 5 months 12 days
Expiry Date	Jun. 12, 2024
1.59 Exercise Price Expire on August 16, 2024 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	188,679
Number of share options exercisable	188,679
Exercise Price	$ 1.59
Remaining Contractual Life	1 year 7 months 17 days
Expiry Date	Aug. 16, 2024
1.59 Exercise Price Expire on December 24,2024 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	3,533,334
Number of share options exercisable	3,533,334
Exercise Price	$ 1.59
Remaining Contractual Life	1 year 11 months 23 days
Expiry Date	Dec. 24, 2024
1.8 Exercise Price Expire on June 12, 2025 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	3,875,000
Number of share options exercisable	3,875,000
Exercise Price	$ 1.8
Remaining Contractual Life	2 years 5 months 12 days
Expiry Date	Jun. 12, 2025
3.24 Exercise Price Expire on December 11, 2025 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	4,796,666
Number of share options exercisable	4,796,666
Exercise Price	$ 3.24
Remaining Contractual Life	2 years 11 months 12 days
Expiry Date	Dec. 11, 2025
5.16 Exercise Price Expire on February 16, 2026 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	250,000
Number of share options exercisable	166,667
Exercise Price	$ 5.16
Remaining Contractual Life	3 years 1 month 17 days
Expiry Date	Feb. 16, 2026
4.53 Exercise Price Expire on April 1, 2026 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	650,000
Number of share options exercisable	433,335
Exercise Price	$ 4.53
Remaining Contractual Life	3 years 3 months
Expiry Date	Apr. 01, 2026
5.84 Exercise Price Expire on June 10, 2026 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	8,900,000
Number of share options exercisable	5,933,334
Exercise Price	$ 5.84
Remaining Contractual Life	3 years 5 months 8 days
Expiry Date	Jun. 10, 2026
5.44 Exercise Price Expire on December 14, 2026 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	7,130,000
Number of share options exercisable	4,753,346
Exercise Price	$ 5.44
Remaining Contractual Life	3 years 11 months 15 days
Expiry Date	Dec. 14, 2026
5.76 Exercise Price Expire on January 18,2027 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	94,277
Exercise Price	$ 5.76
Remaining Contractual Life	4 years 18 days
Expiry Date	Jan. 18, 2027
5.31 Exercise Price Expire on August 17,2027 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	3,565,000
Number of share options exercisable	1,188,333
Exercise Price	$ 5.31
Remaining Contractual Life	4 years 7 months 17 days
Expiry Date	Aug. 17, 2027
5.41 Exercise Price Expire on October 4,2027 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	55,452
Exercise Price	$ 5.41
Remaining Contractual Life	4 years 9 months 3 days
Expiry Date	Oct. 04, 2027
5.57 Exercise Price Expire on December 18,2027 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	5,955,000
Number of share options exercisable	1,985,000
Exercise Price	$ 5.57
Remaining Contractual Life	4 years 11 months 19 days
Expiry Date	Dec. 18, 2027

Share Capital - Summary of Weig

Share Capital - Summary of Weighted Average Grant Date Fair Values (Detail)	12 Months Ended
	Dec. 31, 2022 CAD ($) yr $ / shares	Dec. 31, 2021 CAD ($) yr $ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Expected stock price volatility	62.38%	60.42%
Expected life of options \| yr	5	5
Risk free interest rate	2.87%	1.03%
Expected forfeitures	0%	0%
Expected dividend yield	0%	0%
Weighted average fair value per option granted \| $	$ 3.01	$ 2.88
Weighted average exercise price \| $ / shares	$ 5.47	$ 5.61

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information -Summary Of Detailed Information About Non Cash Investing And Financing Activities (Detail ) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Text block [abstract]
Capitalized share-based payments	$ 6,364	$ 5,257
Exploration and evaluation asset expenditures included in accounts payable and accrued liabilities	4,711	5,681
Interest expense included in accounts payable and accrued liabilities	$ 85	79
Share consideration on sale of properties (Note 5)		$ 3,544

Supplemental Cash Flow Inform_4

Supplemental Cash Flow Information - Additional Information (Detail) - CAD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Text block [abstract]
Cash equivalents	$ 0	$ 0

Related Party Transactions - Di

Related Party Transactions - Disclosure of Information About Key Management Personnel (Detail) - CAD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [abstract]
Key management personnel compensation, short-term employee benefits	[1]	$ 5,379	$ 6,214
Key management personnel compensation, share-based payment	[2]	32,210	29,231
Key management personnel compensation, consulting fees	[3],[4]	231	212
Remuneration attributed to key management personnel		$ 37,820	$ 35,657

[1]Short-term compensation to key management personnel for the year ended December 31, 2022 amounted to $5,379 (2021 - $6,214) of which $5,148 (2021 - $5,954) was expensed and included in salaries, benefits, and directors’ fees on the statement of net loss and comprehensive loss. The remaining $231 (2021 - $260) was capitalized to exploration and evaluation assets.[2]Share-based payments to key management personnel for the year ended December 31, 2022 amounted to $32,210 (2021 - $29,231) of which $31,826 (2021 - $28,766) was expensed and $384 (2021 - $465) was capitalized to exploration and evaluation assets.[3]The Company used consulting services from a company associated with one of its directors in relation to advice on corporate matters for the year ended December 31, 2022 amounting to $130 (2021 - $130).[4]The Company used consulting services from a company associated with one of its employees in relation to various studies for the year ended December 31, 2022 amounting to $101 (2021 - $82).

Related Party Transactions - _2

Related Party Transactions - Disclosure of Information About Key Management Personnel (Parenthetical) (Detail) - CAD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items]
Key management personnel compensation, short-term employee benefits	[1]	$ 5,379	$ 6,214
Key management personnel compensation, share-based payment	[2]	32,210	29,231
Key management personnel compensation, consulting fees	[3],[4]	231	212
Director [Member]
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items]
Key management personnel compensation, consulting fees		130	130
Employees [Member]
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items]
Key management personnel compensation, consulting fees		101	82
Salaries, Employees Benefits and Directors Fee [member]
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items]
Key management personnel compensation, short-term employee benefits		5,148	5,954
Key management personnel compensation, share-based payment		31,826	28,766
Capitalized to Exploration and Evaluation Assets [member]
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items]
Key management personnel compensation, short-term employee benefits		231	260
Key management personnel compensation, share-based payment		$ 384	$ 465

[1]Short-term compensation to key management personnel for the year ended December 31, 2022 amounted to $5,379 (2021 - $6,214) of which $5,148 (2021 - $5,954) was expensed and included in salaries, benefits, and directors’ fees on the statement of net loss and comprehensive loss. The remaining $231 (2021 - $260) was capitalized to exploration and evaluation assets.[2]Share-based payments to key management personnel for the year ended December 31, 2022 amounted to $32,210 (2021 - $29,231) of which $31,826 (2021 - $28,766) was expensed and $384 (2021 - $465) was capitalized to exploration and evaluation assets.[3]The Company used consulting services from a company associated with one of its directors in relation to advice on corporate matters for the year ended December 31, 2022 amounting to $130 (2021 - $130).[4]The Company used consulting services from a company associated with one of its employees in relation to various studies for the year ended December 31, 2022 amounting to $101 (2021 - $82).

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - CAD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [abstract]
Amounts payable and accrued liabilities related party transactions	$ 43	$ 58

Capital Management - Summary of

Capital Management - Summary of Disclosure Of Detailed Information About Management Capital Explanatory (Detail) - CAD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Text block [abstract]
Equity	$ 455,417	$ 461,348	$ 119,252
Convertible debentures (Note 9)	80,021	72,011
Equity And Convertible Debentures	535,438	533,359
Less: Cash	(134,447)	(201,804)	$ (74,022)
Management Capital	$ 400,991	$ 331,555

Financial Instruments And Ris_3

Financial Instruments And Risk Management -Summary Of Maximum Exposure To Credit Risk (Detail) - CAD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of credit risk exposure [abstract]
Cash	$ 134,447	$ 201,804	$ 74,022
Amounts receivable	1,801	1,178
Maximum exposure to credit risk	$ 136,248	$ 202,982

Financial Instruments And Ris_4

Financial Instruments And Risk Management - Summary of Detailed Information About Significant Undiscounted Commitments (Detail) $ in Thousands	Dec. 31, 2022 CAD ($)
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	$ 97,664
Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	15,069
1 to 3 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	77,458
4 to 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	5,137
Over 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0
Trade And Other Payables
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	13,723
Trade And Other Payables \| Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	13,723
Trade And Other Payables \| 1 to 3 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0
Trade And Other Payables \| 4 to 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0
Trade And Other Payables \| Over 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0
Convertible debentures [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	80,021
Convertible debentures [member] \| Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0
Convertible debentures [member] \| 1 to 3 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	74,884
Convertible debentures [member] \| 4 to 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	5,137
Convertible debentures [member] \| Over 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0
Lease Liabilities
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	3,920
Lease Liabilities \| Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	1,346
Lease Liabilities \| 1 to 3 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	2,574
Lease Liabilities \| 4 to 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0
Lease Liabilities \| Over 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	$ 0

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022 CAD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CAD ($)
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	$ 134,447
Current liabilities	$ 16,567		$ 8,205
Convertible debentures, aggregate principal amount		$ 25,000
Borrowings, interest rate	10%	10%
Bottom of range [member]
Disclosure of detailed information about financial instruments [line items]
Borrowings, interest rate	7.50%	7.50%
Top of range [member]
Disclosure of detailed information about financial instruments [line items]
Borrowings, interest rate	8.50%	8.50%
Amounts held in foreign risk [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, net		$ 46,085
Percentage of reasonably possible change in currency rates	10%
Value at risk	$ 6,242

Non-controlling Interests - Add

Non-controlling Interests - Additional Information (Detail) $ / shares in Units, $ in Thousands, $ in Thousands		12 Months Ended
	Dec. 06, 2022 CAD ($) shares	Dec. 31, 2022 CAD ($)	Dec. 31, 2021 CAD ($) shares	Dec. 06, 2022 USD ($) $ / shares	Dec. 31, 2021 $ / shares
Disclosure of noncontrolling interests [line items]
Non-controlling interests		$ 37,541	$ 27,740
The subsidiaries with the exception of isoEnergy [member]
Disclosure of noncontrolling interests [line items]
Proportion of ownership interest in subsidiary		100%
IsoEnergy Ltd. [member]
Disclosure of noncontrolling interests [line items]
Proportion of ownership interest in subsidiary		50.10%	50.50%
Increase Decrease Through Warrants Exercised \| shares	1,801,802		5,223,689
Class Of Warrants Exercise Price Per Share \| $ / shares				$ 3.33	$ 0.6
Proceeds from exercise of warrants	$ 6,000		$ 3,134
Non-controlling interests	$ 7,027			$ 4,000

Non-controlling Interests - Sum

Non-controlling Interests - Summary of Financial Information for IsoEnergy Ltd (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of noncontrolling interests [line items]
Cash	$ 134,447
Marketable securities	5,775	$ 9,315
Total assets	554,560	546,563
Current liabilities	16,567	8,205
Total liabilities	99,143	85,215
Loss from operations	61,310	125,826
Loss and comprehensive loss	63,198	122,213
Net cash flow from operating activities	(20,176)	(16,788)
Net cash flow from investing activities	(68,053)	(46,713)
Net cash flow from financing activities	19,855	191,351
Net increase (decrease) in cash	(67,357)	127,782
Subsidiaries with material non-controlling interests [member]
Disclosure of noncontrolling interests [line items]
Cash	19,913	13,617
Other current assets	212	236
Marketable securities	5,775	9,315
Non-current assets	71,215	61,022
Total assets	97,115	84,190
Current liabilities	2,622	641
Non-current liabilities	28,273	27,636
Total liabilities	30,895	28,277
Loss from operations	7,375	15,781
Loss and comprehensive loss	10,368	10,819
Net cash flow from operating activities	(2,766)	(2,751)
Net cash flow from investing activities	(8,694)	(5,336)
Net cash flow from financing activities	17,756	7,669
Net increase (decrease) in cash	$ 6,296	$ (418)

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Income Taxes at Statutory Rates (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Net loss for the year	$ (61,310)	$ (125,826)
Statutory rate	27%	27%
Expected income tax recovery	$ (16,554)	$ (33,973)
Permanent differences	9,662	8,348
Impact of flow-through shares	30	1,080
Impact of (gain) loss recognized in other comprehensive income	(17)	79
Impact of loss on convertible debt	422	20,572
Change in unrecognized deductible temporary differences	5,412	5,064
Other	3	(48)
Deferred income tax expense (recovery)	$ (1,042)	$ 1,122

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax (Recovery) Expense (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Major components of tax expense (income) [abstract]
Deferred income tax expense (recovery)	$ (1,042)	$ 1,122

Income Taxes - Disclosure Of Ch

Income Taxes - Disclosure Of Change In Fair Value of Convertible Debentures Attributable To Credit Risk Fluctuation (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Change In Fair Value of Convertible Debentures Attributable To Credit Risk Fluctuation [Line Items]
Deferred income tax recovery	$ (461)	$ 701
Change In Fair Value Of Convertible Debentures Attributable To Change In Credit Risk
Disclosure Of Change In Fair Value of Convertible Debentures Attributable To Credit Risk Fluctuation [Line Items]
Deferred income tax recovery	17	(79)
Change in fair value of marketable securities
Disclosure Of Change In Fair Value of Convertible Debentures Attributable To Credit Risk Fluctuation [Line Items]
Deferred income tax recovery	$ (478)	$ 780

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Tax (Assets) and Liabilities (Detail) - CAD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	$ 867	$ 2,536	$ 712
Exploration and evaluation assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	39,120	26,258
Convertible debentures [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	66	241
Non-capital losses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	(38,333)	(24,501)
Share issuance costs [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	(208)	(168)
Equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	(79)	(74)
Marketable Securities [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Marketable securities	$ 301	$ 780

Income Taxes - Summary of Movem

Income Taxes - Summary of Movement in Deferred Tax Liability (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes in deferred tax liability (asset) [abstract]
Opening balance	$ 2,536	$ 712
Recognized in income tax expense	(996)	1,122
Recognized in OCI/equity	(673)	702
Net deferred tax liability	$ 867	$ 2,536

Income Taxes - Significant Comp

Income Taxes - Significant Components of Temporary Differences, Unused Tax Credits and Unused Tax Losses (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Non-capital losses available for future periods [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary Differences	$ 144,633	$ 121,471
Expiry Date	2029 to 2042	2029 to 2041
Share issuance costs [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary Differences	$ 7,156	$ 9,672
Equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary Differences	911	765
Donations [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary Differences	$ 153	$ 133
Expiry Date	2023 to 2027	2022 to 2026

Subsequent Event - Additional I

Subsequent Event - Additional Information (Detail) $ / shares in Units, $ in Thousands				12 Months Ended
	Jan. 06, 2023 CAD ($) $ / shares shares	Jan. 01, 2023 CAD ($) shares	Jun. 30, 2021 CAD ($) shares	Dec. 31, 2022	Dec. 31, 2021 CAD ($)
Subsequent Events [Line Items]
Number of share options exercised				3,247,332	10,020,001
Proceeds from exercise of stock options					$ 25,962
Number of share options granted				9,744,729	17,400,000
Net proceeds from issue of ordinary shares			$ 2,074
Shares issued during period \| shares			400,000
Major ordinary share transactions [member]
Subsequent Events [Line Items]
Number of share options exercised		60,000
Proceeds from exercise of stock options		$ 171
Number of share options granted \| shares		500,000
Net proceeds from issue of ordinary shares	$ 27,700
Common stock shares authorized value	$ 250,000
Shares issued during period \| shares	4,494,959
Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise \| $ / shares	$ 6.23
Gross Proceeds From Issue Of Ordinary Shares	$ 28,000
Commissions during shares issued	$ 280