NexGen Energy (NXE) 40-F 6 Mar 24 2023 FY Annual report (Canada) Financial data

Cover

Cover	12 Months Ended
	Dec. 31, 2023 shares
Document Information [Line Items]
Document Type	40-F
Amendment Flag	false
Entity Interactive Data Current	Yes
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
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	525,340,525
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
Document Financial Statement Error Correction [Flag]	false
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, 2023	Dec. 31, 2022
Current Assets
Cash	$ 290,743	$ 134,447
Marketable securities (Note 5)	0	5,775
Amounts receivable	1,940	1,801
Prepaid expenses and other assets	13,770	2,165
Lease receivable (Note 11(b))	512	0
Total Current Assets	306,965	144,188
Non-Current Assets
Exploration and evaluation assets (Note 6)	451,356	405,248
Property and equipment (Note 7)	5,404	5,048
Investment in associate (Note 8)	240,116	0
Deposits	82	76
Lease receivable (Note 11(b))	3,502	0
Total assets	1,007,425	554,560
Current Liabilities
Accounts payable and accrued liabilities	26,986	13,723
Lease liabilities (Note 11(c))	926	775
Flow-through share premium liability (Note 9)	0	2,069
Total Current Liabilities	27,912	16,567
Non-current Liabilities
Convertible debentures (Note 10)	158,478	80,021
Long-term lease liabilities (Note 11(c))	1,016	1,688
Deferred income tax liabilities (Note 19)	0	867
Total liabilities	187,406	99,143
Equity
Share capital (Note 12)	1,009,130	712,603
Reserves (Note 12)	116,934	94,680
Accumulated other comprehensive income(loss)	(2,041)	460
Accumulated deficit	(304,004)	(389,867)
Equity attributable to NexGen Energy Ltd. shareholders	820,019	417,876
Non-controlling interests (Note 17)	0	37,541
Total equity	820,019	455,417
Total liabilities and equity	$ 1,007,425	$ 554,560

Consolidated Statements of Net

Consolidated Statements of Net Income (Loss) and Comprehensive Income (Loss) $ in Thousands	12 Months Ended
	Dec. 31, 2023 CAD ($) $ / shares shares	Dec. 31, 2022 CAD ($) $ / shares shares
Profit or loss [abstract]
Salaries, benefits and directors' fees	$ 12,704	$ 9,306
Office, administrative, and travel	15,616	7,853
Professional fees and insurance	17,469	5,661
Depreciation (Note 7)	1,804	1,814
Share-based payments (Note 12)	37,142	35,146
Total value	(84,735)	(59,780)
Finance income	6,030	2,787
Mark-to-market loss on convertible debentures (Note 10)	(48,745)	(2,863)
Interest expense on convertible debentures (Note 10)	(6,098)	(2,179)
Interest on lease liabilities (Note 11(c))	(153)	(207)
Share of net income from associate (Note 8)	920	0
Gain on loss of control of IsoEnergy (Note 17)	204,038	0
Other expense	(1,378)	(85)
Foreign exchange gain (loss)	(1,123)	1,017
Income (loss) before taxes	68,756	(61,310)
Deferred income tax recovery (Note 19)	1,412	1,042
Net income (loss)	70,168	(60,268)
Items that may not be reclassified subsequently to profit or loss:
Change in fair value of convertible debenture attributable to the change in credit risk of the Company (Note 10)	(1,432)	149
Change in fair value of marketable securities (Note 5)	(900)	(3,540)
Deferred income tax recovery	449	461
Share of other comprehensive income (loss) of associate (Note 8)	(539)	0
Net comprehensive income (loss)	67,746	(63,198)
Net income (loss) attributable to:
Shareholders of NexGen Energy Ltd.	80,816	(56,587)
Non-controlling interests	(10,648)	(3,681)
Net income (loss)	70,168	(60,268)
Net comprehensive income (loss) attributable to:
Shareholders of NexGen Energy Ltd.	78,898	(58,022)
Non-controlling interests	(11,152)	(5,176)
Net comprehensive income (loss)	$ 67,746	$ (63,198)
Earnings (loss) per share attributable to NexGen Energy Ltd.
Basic earnings (loss) per share | (per share)	$ 0.16	$ (0.12)
Diluted earnings (loss) per share | (per share)	$ 0.16	$ (0.12)
Weighted average common shares outstanding
Basic | shares	498,243,824	479,680,438
Diluted | shares	529,214,619	479,680,438

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from (used in) from operating activities
Net income (loss) for the year:	$ 70,168	$ (60,268)
Adjust for:
Depreciation (Note 7)	1,804	1,814
Share-based payments (Note 12)	37,142	35,146
Mark-to-market loss on convertible debenture (Note 10)	48,745	2,863
Interest expense on convertible debentures (Note 10)	6,098	2,179
Interest on lease liabilities (Note 11(c))	153	207
Share of net income from associate (Note 8)	(920)	0
Gain on loss of control of IsoEnergy (Note 17)	(204,038)	0
Deferred income tax recovery	(1,412)	(1,042)
Unrealized foreign exchange (gain) loss	964	(1,017)
Other expense	1,378	85
Operating cash flows before working capital	(39,918)	(20,033)
Changes in working capital items:
Amounts receivable	(132)	(623)
Prepaid expenses and other	(13,893)	(1,137)
Accounts payable and accrued liabilities	1,332	1,617
Deposits	(5)	0
Cash used in operating activities	(52,616)	(20,176)
Cash flows used in investing activities
Expenditures on exploration and evaluation assets (Note 6)	(109,741)	(67,699)
Disposal of cash due to deconsolidation of Iso Energy	(42,329)	0
Acquisition of marketable securities (Note 5)	(2,000)	0
Acquisition of equipment (Note 7)	(6,066)	(354)
Cash used in investing activities	(160,136)	(68,053)
Cash flows from (used in) financing activities
Proceeds from at-the-market equity program, net of issuance costs (Note 12)	175,858	0
Shares issued from IsoEnergy Ltd. for cash from private placements, net of share issuance costs	21,605	6,244
Issuance of convertible debentures, net of issuance costs (Note 10)	147,955	5,296
Proceeds from exercise of options	27,609	10,717
Payment of lease liabilities (Note 11(c))	(928)	(913)
Interest paid on convertible debentures	(3,209)	(1,489)
Cash provided by financing activities	368,890	19,855
Foreign exchange loss on cash	158	1,017
Increase (decrease) in cash	156,296	(67,357)
Cash, beginning of year	134,447	201,804
Cash, end of year	$ 290,743	$ 134,447

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, 2021	$ 461,348	$ 695,856	$ 68,837	$ 1,895	$ (332,980)	$ 433,608	$ 27,740
Beginning balance, shares at Dec. 31, 2021		479,198,233
Statement [LineItems]
Share-based payments (Note 12)	41,510		32,103			32,103	9,407
Shares issued on exercise of stock options (Note 12)	$ 10,001	$ 16,261	(6,260)			10,001
Shares issued on exercise of stock options (Note 12) shares	3,247,332	3,247,332
Shares issued for convertible debenture interest payments (Note 10)	$ 486	$ 486				486
Shares issued for convertible debenture interest payments (Note 10), shares		84,580
Ownership changes relating to non-controlling interests	5,270				(300)	(300)	5,570
Net income (loss) for the year	(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
Statement [LineItems]
At-the-market equity program, net of issuance costs (Note 12)	175,176	$ 175,176				175,176
At-the-market equity program, net of issuance costs (Note 12), shares		24,724,125
Share-based payments (Note 12)	44,009		38,542			38,542	5,467
Shares issued on exercise of stock options (Note 12)	26,349	$ 42,637	(16,288)			26,349
Shares issued on exercise of stock options (Note 12) shares		8,608,816
Shares issued on convertible debentures conversion (Note 10)	72,773	$ 72,773				72,773
Shares issued on convertible debentures conversion (Note 10), shares		8,663,461
Shares issued for convertible debenture interest payments (Note 10)	1,498	$ 1,498				1,498
Shares issued for convertible debenture interest payments (Note 10), shares		179,363
Shares issued for convertible debenture establishment fee (Note 10)	4,443	$ 4,443				4,443
Shares issued for convertible debenture establishment fee (Note 10). shares		634,615
Ownership changes relating to non-controlling interests	(27,392)				5,408	5,408	(32,800)
Net income (loss) for the year	70,168				80,816	80,816	(10,648)
Reclass accumulated other comprehensive income related to converted debentures (Note 10)				361	(361)
Other comprehensive loss	(2,422)			(2,862)		(2,862)	440
Ending balance at Dec. 31, 2023	$ 820,019	$ 1,009,130	$ 116,934	$ (2,041)	$ (304,004)	$ 820,019	$ 0
Ending balance, shares at Dec. 31, 2023		525,340,525

REPORTING ENTITY

REPORTING ENTITY	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
REPORTING ENTITY	1. REPORTING ENTITY NexGen Energy Ltd. (“NexGen” or the “Company”) is an exploration and 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. On December 5, 2023, NexGen deconsolidated IsoEnergy due to the completion of a merger between IsoEnergy and Consolidated Uranium Inc. (Notes 4(b), 8, 17) which resulted in NexGen losing control of IsoEnergy. The Company owns approximately

NATURE OF OPERATIONS

NATURE OF OPERATIONS	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
NATURE OF OPERATIONS	2. NATURE OF OPERATIONS As an exploration and development stage company, the Company does not have revenues and historically has recurring operating losses. As at December 31, 2023, the Company had an accumulated deficit of $304,004 and working capital of $279,053. Although the Company will be required to obtain additional funding in order to continue with the exploration and development of its mineral properties, the Company has sufficient working capital to meet its current obligations for at least the next fifteen months. 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
	Dec. 31, 2023
Text block [abstract]
BASIS OF PREPARATION	3. BASIS OF PREPARATION Statement of Compliance These consolidated financial statements for the year ended December 31, 2023, 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 March 6, 2024. 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 10) the marketable securities (Note 5), and the investment in associate under the equity method as of December 5, 2023 (Notes 8 and 17). 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) 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 12 for further details. (ii) 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 10 for further details. The information about significant areas of judgment considered by management in preparing the financial statements is as follows: (iii) 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. (iv) Assessment of Control Control is achieved when the Company is exposed to variable returns from its involvement with an investee, and has the ability to affect those returns through its power over the investee. When evaluating whether the Company has power over an investee, factors beyond holding the majority of the voting rights are considered, including the size of the investor’s holding of voting rights relative to the size and dispersion of other vote holders, substantive potential voting rights, rights arising from other contractual arrangements, and rights sufficient to unilaterally direct the relevant activities of the investee (i.e. de facto control). Where it is not clear, having considered these additional factors, that the Company has power, the Company does not control the investee. Judgment is required in determining whether the Company has power over the investee when the Company does not hold the majority of the voting rights of the investee.

MATERIAL ACCOUNTING POLICIES

MATERIAL ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
MATERIAL ACCOUNTING POLICIES	4. MATERIAL ACCOUNTING POLICIES The material 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 The accounts of the subsidiaries controlled by the Company are included in the consolidated financial statements from the date that control commenced until the date that control ceases. Control is achieved when the Company is exposed to variable returns from its involvement with an investee, and has the ability to affect those returns through its power over the investee. The subsidiaries of the Company and their geographic locations at December 31, 2023 are as follows: Name of Subsidiary Location Percentage Ownership    NXE Energy Royalty Ltd. Canada 100% NXE Energy SW1 Ltd. Canada 100% NXE Energy SW3 Ltd. Canada 100% Intercompany balances, transactions, income and expenses arising from intercompany transactions are eliminated in full on consolidation. On September 27, 2023, IsoEnergy and Consolidated Uranium Inc. (“CUR”) announced that they entered into a definitive arrangement agreement for a share-for-share TSX-V. On December 5, 2023, upon completion of the Merger, NexGen’s ownership in IsoEnergy decreased from 48.7% immediately prior to the transaction to %, resulting in NexGen’s loss of control of IsoEnergy (Notes 8 and 17). NexGen retained significant influence over IsoEnergy, and the investment was recorded at its fair value on December 5, 2023, upon initial recognition. As at December 31, 2023 NexGen’s ownership in IsoEnergy was %. (c) Investments in Associates Investments over which the Company exercises significant influence but does not control are associates. Investments in associates are accounted for using the equity method, except when classified as held for sale. The equity method involves recording the initial investment at cost and subsequently adjusting the carrying value of the investment for our proportionate share of the profit (loss), other comprehensive income (loss), and any other changes in the associates’ net assets, such as further investments or dividends. The proportionate share of the associate’s profit (loss) and other comprehensive income (loss) is based on the associate’s If the share of the associate’s losses were equal to or exceeded the investment in the associate, recognition of further losses would be discontinued. After the interest is reduced to zero, additional losses would be provided for and a liability recognized only to the extent that incurred legal or constructive obligations to provide additional funding or to make payments on behalf of the associate or joint venture exist. If the associate or joint venture subsequently reports profits, the Company would resume recognizing our share of those profits once there is a positive interest in the entity. At each balance sheet date, the Company considers whether there is objective evidence of an impairment in associates. (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 income (loss) and comprehensive income (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 income (loss) and comprehensive income (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. (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 two years. Failure to expend such funds as required under the Canadian income tax legislation will result in a Part XII.6 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) Earnings (loss) per share Basic earnings (loss) per share is calculated by dividing the earnings 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 earnings (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. (m) Income taxes Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in the statement of net income (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 income (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 Company has elected to combine the host debt and conversion option and to measure the combined convertible debenture instruments at FVTPL (Note 10). (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 income (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 recogni z non-current, z

MARKETABLE SECURITIES

MARKETABLE SECURITIES	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
MARKETABLE SECURITIES	5. MARKETABLE SECURITIES At December 31, 2022, marketable securities consisted Labrador Uranium Inc.) (“Latitude Uranium”). On February 22, 2022, CUR completed its spin-out pro-rata one-half The carrying value of marketable securities is based on the estimated fair value of the common shares and warrants, respectively determined using published closing share prices and the Black-Scholes option pricing model. 92 Energy Consolidated Uranium Latitude Uranium Shares Latitude Uranium Warrants Total  Fair value at December 31, 2022 $  4,253 $   1,458 $  64 $  - $ 5,775  Acquired during the period - - 1,581 419 2,000  Fair value adjustment (492) 378 (581) (205) (900)  Disposals due to deconsolidation of IsoEnergy (3,761) (1,836) (1,064) (214) (6,875)  Fair Value at December 31, 2023 $ -    $ -  $ - $  - $ -

EXPLORATION AND EVALUATION ASSE

EXPLORATION AND EVALUATION ASSETS	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
EXPLORATION AND EVALUATION ASSETS	6. EXPLORATION AND EVALUATION ASSETS Rook I Other Athabasca Basin Properties  IsoEnergy  Properties Total  Acquisition Cost  Balance at December 31, 2022  $ 235 $ 1,458 $ 26,628 $ 28,321  Additions - 1 4 5  Disposals due to deconsolidation of IsoEnergy - - (26,632) (26,632)  Balance as at December 31, 2023  $ 235 $ 1,459   $ -  $ 1,694  Deferred exploration costs  Balance at December 31, 2022 329,012 9,603 38,312 376,927   Additions:  General exploration and drilling 6,488 7,574 5,514 19,576  Environmental, permitting, and engagement 17,583 - - 17,583  Technical, engineering and design 59,863 - 54 59,917  Geochemistry and assays - - 143 143  Geological and geophysical 323 2,978 2,732 6,033  Labour and wages 14,796 1,109 1,048 16,953  Share-based payments (Note 12) 5,605 - 1,262 6,867  Travel 954 - 303 1,257   Total Additions 105,612 11,661 11,056 128,329 Disposals due to deconsolidation of IsoEnergy (6,226) - (49,368) (55,594)  Balance as at December 31, 2023 $ 428,398  $ 21,264    $ -  $ 449,662  Total costs, December 31, 2023 $   428,633  $   22,723    $ -  $   451,356 Rook I Other Athabasca Basin Properties  IsoEnergy  Properties 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 - 837 9,655  Share-based payments (Note 12) 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

PROPERTY AND EQUIPMENT

PROPERTY AND EQUIPMENT	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
PROPERTY AND EQUIPMENT	7. PROPERTY AND EQUIPMENT Computer Equipment  Software Field Equipment and Vehicles Office, Furniture and Leasehold Improvements Road Total Cost As at December 31, 2021    $ 497 $  1,355   $ 6,645    $ 5,781  $ 2,079  $ 16,357 Additions 122 4 20 110 - 256 As at December 31, 2022    $ 619 $  1,359   $ 6,665    $ 5,891  $  2,079  $ 16,613 Additions 66 - 6,009 253 - 6,328 Disposals - - (101) - - (101) Transfer to lease receivable (Note 11(b)) - - (4,100) - - (4,100) Disposals due to deconsolidation of IsoEnergy - (65) (107) - - (172) Balance as at December 31, 2023    $ 685 $  1,294   $ 8,366    $ 6,144  $ 2,079  $  18,568 Accumulated Depreciation As at December 31, 2021   $ 427 $ 1,043   $ 4,180    $ 2,116   $ 1,972   $ 9,738 Depreciation 89 172 523 982 61 1,827 As at December 31, 2022   $ 516 $ 1,215   $ 4,703    $ 3,098   $ 2,033   $ 11,565 Depreciation 83 79 626 980 46 1,814 Disposals - - (81) - - (81) Disposals due to deconsolidation of IsoEnergy - (65) (69) - - (134) Balance as at December 31, 2023   $ 599 $ 1,229   $ 5,179     $ 4,078   $ 2,079   $ 13,164 Net book value at December 31,2022   $ 103 $ 144   $ 1,962     $ 2,793   $ 46    $ 5,048 Net book value at December 31, 2023   $ 86 $  65   $ 3,187     $ 2,066   $ -    $ 5,404

INVESTMENT IN ASSOCIATE

INVESTMENT IN ASSOCIATE	12 Months Ended
	Dec. 31, 2023
Disclosure of associates [abstract]
INVESTMENT IN ASSOCIATE	8. INVESTMENT IN ASSOCIATE IsoEnergy Ltd.  Balance, December 31, 2022 $ -  Fair value of retained interest in IsoEnergy on December 5, 2023 239,735  Share of net income from associate 920  Share of other comprehensive income (loss) from associate (539)  Balance, December 31, 2023 $ 240,116  Fair value of investment in associate as at December 31, 2023 $  216,289  The fair value of the investment in associate as at December 31, 2023 is measured using the closing market price of IsoEnergy on December 29, 2023. Summarized financial information for IsoEnergy Ltd. is as follows:    December 31, 2023 December 31, 2022 Cash $ 37,033 $ 19,913 Other current assets 1,192 212 Marketable securities 17,036 5,775 Non-current 291,937 71,215 Total assets $     347,198 $     97,115 Current liabilities 3,617 2,622 Non-current 40,561 28,273 Total liabilities $ 44,178 $ 30,895 Loss from operations $ 18,689 $ 7,375 Other comprehensive loss $ 2,618 $ 2,993 Total comprehensive loss $ 21,307 $ 10,368 T he loss from operations and other comprehensive loss of IsoEnergy fo r t

FLOW-THROUGH SHARE PREMIUM LIAB

FLOW-THROUGH SHARE PREMIUM LIABILITY	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
FLOW-THROUGH SHARE PREMIUM LIABILITY	9. 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 was obligated to spend $4,919 by December 31, 2023 on eligible exploration expenditures. As the commitment was satisfied, the remaining balance of the flow-through premium liability was th The flow-through share premium liability for the years ended December 31, is comprised of:   2023     2022  Balance, beginning of year $   2,069 $ -  Liability incurred on flow-through shares issued - 2,115  Settlement of flow-though share liability on expenditures (2,069) (46)  Balance, end of year $ - $   2,069

CONVERTIBLE DEBENTURES

CONVERTIBLE DEBENTURES	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
CONVERTIBLE DEBENTURES	10. CONVERTIBLE DEBENTURES 2023 2020 2020 IsoEnergy Debentures 2022 IsoEnergy Debentures Total  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  Fair value on issuance 143,702 - - - 143,702  Fair value adjustment 14,776 20,158 13,938 1,305 50,177  Settlement with shares - (72,773) - - (72,773)  Disposals due to deconsolidation of IsoEnergy - - (36,207) (6,442) (42,649)  Fair Value at December 31, 2023 $ 158,478  $ -  $ -  $ - $  158,478 The fair value of the debentures increased from $80,021 on December 31, 2022 to $158,478 at December 31, 2023, due to the issuance of the 2023 Debentures offset by the conversion of the 2020 Debentures into common shares of the Company and the loss of control of IsoEnergy. The increase in fair value mark-to-market 2020 Debentures On September 28, 2023, the holders of the 2020 Debentures elected to convert their US$15 million principal amount of 7.5% unsecured convertible debentures, due to mature on May 27, 2025, into common shares of the Company. The Company issued 8,663,461 common shares relating to the conversion of the principal and 19,522 common shares relating to the accrued and unpaid interest up to the date of conversion for the 2020 Debentures. The amounts recorded in Other Comprehensive Income as a result of changes in credit risk of the 2020 Debentures from inception through to conversion totaling losses of $361 were reclassified to accumulated deficit. The fair value of the 2020 Debentures at conversion was based on the number of shares issued at the closing share price on the conversion date of 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. During the period ended December 4 , 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 debentures were marked to market up to immediately prior to the deconsolidation of IsoEnergy at December 4, 2023 December 31, 2022    Volatility 54.00% 52.80%  Expected life 1.7 years 2.6 years  Risk free interest rate 4.18% 4.27%  Expected dividend yield 0% 0%  Credit spread 22.22% 23.85%  Underlying share price of IsoEnergy $4.13 $2.91  Conversion exercise price $0.88 $0.88  Exchange rate (C$:US$) $0.739 $0.738 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 2022 4 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. The debentures were marked to market up to immediately prior to the deconsolidation of IsoEnergy at the close of business on December 4, 2023 . The inputs used in the pricing model as at December 4, 2023 and December 31, 2022 are as follows: December 4, 2023 December 31, 2022   Expected Volatility 54.00%   52.80%  Expected life in years 4.0 years 4.9 years  Risk free interest rate 3.96% 3.76%  Expected dividend yield 0% 0%  Credit spread 22.22% 23.85%  Underlying share price of IsoEnergy $4.13 $2.91  Conversion exercise price $4.33 $4.33  Exchange rate (C$:US$) $0.739 $0.738 2023 Debentures On September 22, 2023, the Company entered into a US$110 million private placement of unsecured convertible debentures (the “2023 Debentures”). The Company received gross proceeds of $148,145 (US$110 million), and paid a 3% establishment fee of $4,443 (US$3,300) to the debenture holders through the issuance of 634,615 common shares. The fair value of the 2023 Debentures on issuance date was determined to be $143,702 (US$106,700). The 2023 Debentures bear interest at a rate of 9 During the period ended December 31, 2023, NexGen issued 113,803 shares for a value of $1,064 (US$724) and paid $1,967 (US$1,448) associated with the interest payment. The 2023 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, 2023 and September 22, 2023 are as follows: December 31, 2023 September 22, 2023   Volatility 43.00% 45.00%  Expected life 4.7 years 5.0 years  Risk free interest rate 3.84% 4.63%  Expected dividend yield 0% 0%  Credit spread 16.60% 17.16%  Underlying share price of the Company US$7.00 US$6.12  Conversion exercise price US$6.76 US$6.76

LEASES

LEASES	12 Months Ended
	Dec. 31, 2023
Presentation of leases for lessee [abstract]
LEASES	11. LEASES (a) Right-of-use December 31, 2023 December 31, 2022   Right-of-use  $   1,933  $   2,640  Additions 246 -  Depreciation (705) (707)  Balance, end of period  $ 1,474  $ 1,933 The right-of-use (b) Lease receivable On April 5, 2023 NexGen completed a purchase agreement whereby the Company acquired $4,100 of equipment and immediately thereafter leased the equipment to a third party. The lease payments commence the first day of the month following the six-month The discounted and undiscounted value of the remaining lease payments as at December 31, 2023 is as follows: Less than 1 year 1 to 3 years 4 to 5 years Over 5 years  Total  Lease receivable $  512 $  769 $  1,025 $  1,708 $  4,014 December 31, 2023   December 31, 2022  Current portion 512 -  Non-current 3,502 -  Balance, end of period   $    4,014   $    - (c) Lease liabilities December 31, 2023   December 31, 2022  Lease liabilities, beginning of period   $    2,463   $ 3,169  Additions 254 -  Interest expense on lease liabilities 153 207  Payment of lease liabilities (928) (913)  Balance, end of period   $ 1,942   $ 2,463  Current portion 926 775  Non-current 1,016 1,688  Balance, end of period   $ 1,942   $    2,463 The undiscounted value of the lease liabilities as at December 31, 2023 was $2,952 (December 31, 2022 - $3,920). (d) Amounts recognized in consolidated statements of net income (loss) Year ended December 31, 2023 2022  Expense relating to variable lease payments $    417  $    417 The Company engages drilling companies to carry out its drilling programs o right-of-use

SHARE CAPITAL

SHARE CAPITAL	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
SHARE CAPITAL	12. SHARE CAPITAL (a) Authorized capital Unlimited common shares without par value. Unlimited preferred shares without par value. Share issuances for the year ended December 31, 2023: On January 6, 2023, NexGen established an at-the-market On December 11, 2023, NexGen updated its ATM Program in accordance with the terms of an equity distribution agreement dated December 11, 2023 (the “December Sales Agreement”) with Virtu ITG Canada Corp., as Canadian agent, and Virtu Americas, LLC, as U.S. agent (together, the “Agents”), which allowed it to issue up to $500 million of common shares. Concurrent with entering into the December Sales Agreement, the January Sales Agreement was terminated. Prior to the termination of the January Sales Agreement, the Company issued 24,724,125 shares under the ATM Program at an average price of $7.36 per share for gross proceeds of $182,066 and recognized $6,890 of share issuance costs, consisting of commission fees of $3,704 and other transaction costs of $3,186. The share issuance costs have been presented net within share capital. The Company did not issue shares under the December Sales Agreement during the year ended December 31, 2023. During the year ended December 31, 2023, the Company issued 8,608,816 shares on the exercise of stock options for gross proceeds of $26,349 (Note 12(b)). As a result of the exercises, $16,288 was reclassified from reserves to share capital. On June 9, 2023, the Company issued 46,038 shares relating to the interest payment on the 2020 Debentures at a fair value of $270 (Note 10). On September 22, 2023, the Company issued 634,615 shares relating to payment of the establishment fee for the 2023 Debentures at a fair value of $4,443 (Note 10). On September 28, 2023, the Company issued 8,663,461 common shares relating to the conversion of the principal of the 2020 Debentures at a fair value of $72,773. In addition, 19,522 common shares were issued relating to the accrued and unpaid interest up to the date of conversion for the 2020 Debentures at a fair value of $164 (Note 10). On December 11, 2023, the Company issued 113,803 shares relating to the interest payment on the 2023 Debentures at a fair value of $1,064 (Note 10). Share issuances for the year ended December 31, 2022: 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 12(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. 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. (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 20% 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, 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 49,638,890 $ 4.07   Granted 10,849,062 8.15   Exercised (8,608,816) 3.06   Forfeited (313,334) 5.51    At December 31, 2023 – Outstanding 51,565,802 $ 5.08    At December 31, 2023 – Exercisable 41,268,569 $ 4.52   The following table summarizes information about the exercisable share options outstanding as at December 31, 2023: Number of share options outstanding Number of share Exercise prices (C$) Remaining Expiry date   500,000 500,000 2.27 0.22 March 21, 2024 250,000 250,000 2.22 0.24 March 27, 2024 2,900,000 2,900,000 1.92 0.45 June 12, 2024 188,679 188,679 1.59 0.63 August 16, 2024 3,400,000 3,400,000 1.59 0.98 December 24, 2024 3,875,000 3,875,000 1.80 1.45 June 12, 2025 4,766,666 4,766,666 3.24 1.95 December 11, 2025 250,000 250,000 5.16 2.13 February 16, 2026 250,000 250,000 4.53 2.25 April 1, 2026 8,330,000 8,330,000 5.84 2.44 June 10, 2026 6,781,666 6,781,666 5.44 2.96 December 14, 2026 94,277 47,139 5.76 3.05 January 18, 2027 3,370,000 2,240,014 5.31 3.63 August 17, 2027 55,452 27,726 5.41 3.76 October 4, 2027 5,905,000 3,925,013 5.57 3.97 December 18, 2027 300,000 100,000 6.55 4.09 January 31, 2028 4,795,000 1,598,333 6.99 4.65 August 22, 2028 39,062 - 7.68 4.76 October 4, 2028 5,515,000 1,838,333 9.33 4.95 December 11, 2028 51,565,802 41,268,569 The following weighted average assumptions were used for Black-Scholes valuation of the share options granted: For the year ended December 31,   2023 2022    Expected stock price volatility 61.24% 62.38%  Expected life of options 5 years 5 years  Risk free interest rate 3.67% 2.87%  Expected forfeitures 0% 0%  Expected dividend yield 0% 0%  Weighted average fair value per option granted in period $4.48 $3.01  Weighted average exercise price $8.15 $5.47 Share-based payments for options vested for the year ended December 31, 2023 amounted to $44,009 (year ended December 31, 2022 – $41,510) of which $37,142 (year ended December 31, 2022 – $35,146) was expensed to the statement of net income (loss) and comprehensive income (loss) and $6,867 (year ended December 31, 2022 - $6,364) was capitalized to exploration and evaluation assets (Note 6).

SUPPLEMENTAL CASH FLOW INFORMAT

SUPPLEMENTAL CASH FLOW INFORMATION	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
SUPPLEMENTAL CASH FLOW INFORMATION	13. SUPPLEMENTAL CASH FLOW INFORMATION The Company did not have any cash equivalents as at December 31, 2023 and December 31, 2022. a)  Schedule of non-cash Year ended December 31,  2023 2022    Capitalized share-based payments $ 6,867 $     6,364  Exploration and evaluation asset expenditures included in accounts payable and accrued liabilities   10,929 4,711   Interest expense included in accounts payable and accrued liabilities 773 85

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	12 Months Ended
	Dec. 31, 2023
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RELATED PARTY TRANSACTIONS	14. 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, 2023  2022    Short-term compensation (1) $   7,317     $   5,379   Share-based payments (2) 33,319  32,210   Consulting fees (3) (4) 130  231  $  40,766     $  37,820  (1) (2) (3) (4) As at December 31, 2023, there was $43 (December 31, 2022 - $43) included in accounts payable and accrued liabilities owing to a director for compensation.

CAPITAL MANAGEMENT

CAPITAL MANAGEMENT	12 Months Ended
	Dec. 31, 2023
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CAPITAL MANAGEMENT	15. 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, 2023 December 31, 2022   Equity $     820,019 $     455,417   Convertible debentures (Note 10) 158,478 80,021  978,497 535,438   Less: Cash (290,743) (134,447)  $     687,754 $     400,991

FINANCIAL INSTRUMENTS AND RISK

FINANCIAL INSTRUMENTS AND RISK MANAGEMENT	12 Months Ended
	Dec. 31, 2023
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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT	16. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT The Company’s financial instruments consist of cash, marketable securities, warrants, 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 and warrants are re-measured T 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, amounts receivable, and lease receivable. The Company’s maximum exposure to credit risk is as follows:  December 31, 2023    December 31, 2022   Cash $ 290,743   $ 134,447   Amounts receivable 1,940   1,801   Lease receivable 4,014   -  $ 296,697   $ 136,248  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, 2023, NexGen had cash of $290,743 to settle current liabilities of $27,912. The Company’s significant undiscounted commitments at December 31, 2023 are as follows: Less than 1 year 1 to 3 years 4 to 5 years Over 5 years Total   Trade and other payables $  26,986  $     -  $    - $  -  $  26,986   Convertible debentures (Note 10) -    - 158,478 - 158,478   Lease liabilities (Note 11(c)) 1,476  1,476 - - 2,952  $  28,462  $  1,476  $  158,478 $  -  $ 188,416  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 and the 2023 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 2023 Debentures. At maturity, the US$110 million principal amount of the 2023 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 2023 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 2023 Debentures more costly to repay. As at December 31, 2023, the Company’s US dollar net financial liabilities were US$81,006. Thus a 10% change in the Canadian dollar versus the US dollar exchange rates would give rise to a $10,728 change in net income and comprehensive income. 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 comm o 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
	Dec. 31, 2023
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NON-CONTROLLING INTERESTS	17. 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. On December 5, 2023, IsoEnergy and CUR completed the Merger, (Note 4b) whereby IsoEnergy acquired all of the issued and outstanding common shares of CUR. In connection with the , Upon completion of the Merger, NexGen’s ownership in IsoEnergy decreased from 48.7% immediately prior to the transaction to 34.0% resulting in NexGen’s loss of control of IsoEnergy. Upon loss of control, NexGen derecognized the non-controlling resulting in derecognition of net assets attributable to NexGen retained multiplied by NexGen’s remaining shareholdings in IsoEnergy. For financial reporting purposes, the assets, liabilities, results of operations, and cash flows of the Company’s wholly owned subsidiaries and, prior to the loss of control of IsoEnergy on D ec non-wholly non-controlling From December 5, 2023 to December 31, 2023, NexGen’s investment in IsoEnergy has been accounted for using the equity method.

EARNINGS (LOSS) PER SHARE

EARNINGS (LOSS) PER SHARE	12 Months Ended
	Dec. 31, 2023
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EARNINGS (LOSS) PER SHARE	18. EARNINGS (LOSS) PER SHARE Basic net earnings (loss) per share provides a measure of the interests of each ordinary common share in the Company’s performance over the year. Diluted net earnings (loss) per share adjusts basic net income (loss) per share for the effect of all dilutive potential common shares. For the year ended December 31,   2023 2022    Basic earnings (loss) per share   Net income (loss) attributable to NexGen shareholders $  80,816 $  (56,587)     Weighted average number of common shares 498,243,824 479,680,438     Basic earnings (loss) per share $   0.16 $ (0.12)    Diluted earnings (loss) per share   Diluted earnings (loss) available to NexGen shareholders $  80,816 $ (56,587)     Weighted average number of common shares 498,243,824 479,680,438     Effect of share options on issue 14,698,606 -     Weighted average number of common shares (diluted) 529,214,619 479,680,438     Diluted earnings (loss) per share $ 0.16 $ (0.12)   As at December 31, 2023, 10,349,062 (December 31, 2022 – nil) options were excluded from the diluted weighted average number of common shares calculation.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2023
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INCOME TAXES	19. INCOME TAXES A reconciliation of income taxes at statutory rates with the reported taxes is as follows: 2023 2022    Net income (loss) for the year $    68,756  $   (61,310)    Statutory rate 27.00% 27.00%    Expected income tax expense (recovery) $    18,564  $   (16,554)    Permanent differences 7,617 9,662    Impact of renunciation of flow-through shares 1,328 30    Impact of (gain) loss recognized in other comprehensive income 328 (17)    Impact of loss on convertible debt 13,900 422    Impact on deconsolidation of IsoEnergy (27,361) -    Change in unrecognized deductible temporary differences (15,778) 5,412    Other (10) 3    Deferred income tax recovery $    (1,412)  $    (1,042)   The Company’s income tax recovery is comprised of the following:    2023    2022   Deferred income tax recovery $ (1,412) $ (1,042)  Total $ (1,412) $ (1,042) The Company’s deferred tax items recognized in OCI during the year:    2023    2022  Change in fair value of convertible debentures attributable to the change in credit risk $ (328) $ 17 Change in fair value of marketable securities (121) (478) Total $ (449) $ (461) 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:    2023    2022    Exploration and evaluation assets $ 46,658 $ 39,120   Convertible debentures 1,559 66   Non-capital (73,070) (38,333)   Investment in associate 24,853 -   Share issuance costs - (208)   Equipment - (79)   Marketable securities - 301  Net deferred tax liabilities $ - $ 867 Movement in the Company’s deferred tax liability balance in the year is as follows:    2023    2022    Opening balance $ 867 $ 2,536    Recognized in income tax expense (recovery) 657 (996)   Recognized in OCI/equity (449) (673)   Disposal due to deconsolidation of IsoEnergy (1,075) -  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 2023 Expiry Date Range 2022 Expiry Date  Range    Non-capital $  96,732 2029 to 2043 $  144,633 2029 to 2042   Share issuance costs 13,748 - 7,156 -   Equipment 460 - 911 -   Donations 196 2024 to 2028 153 2023 to 2027 Tax attributes are subject to review, and potential adjustment, by tax authorities.

SEGMENT INFORMATION

SEGMENT INFORMATION	12 Months Ended
	Dec. 31, 2023
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SEGMENT INFORMATION	20. SEGMENTED INFORMATION The Company operates in one reportable segment, being the acquisiti o All non-current

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
	Dec. 31, 2023
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SUBSEQUENT EVENTS	21. SUBSEQUENT EVENTS Subsequent to December 31, 2023, 13,000,800 shares wer e for gross proceeds of million less commissions of million and other transaction costs of million for net proceeds of $130.2 million. Additionally, 1,208,332 options were exercised for gross proceeds of $4,035.

MATERIAL ACCOUNTING POLICIES (P

MATERIAL ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2023
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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 The accounts of the subsidiaries controlled by the Company are included in the consolidated financial statements from the date that control commenced until the date that control ceases. Control is achieved when the Company is exposed to variable returns from its involvement with an investee, and has the ability to affect those returns through its power over the investee. The subsidiaries of the Company and their geographic locations at December 31, 2023 are as follows: Name of Subsidiary Location Percentage Ownership    NXE Energy Royalty Ltd. Canada 100% NXE Energy SW1 Ltd. Canada 100% NXE Energy SW3 Ltd. Canada 100% Intercompany balances, transactions, income and expenses arising from intercompany transactions are eliminated in full on consolidation. On September 27, 2023, IsoEnergy and Consolidated Uranium Inc. (“CUR”) announced that they entered into a definitive arrangement agreement for a share-for-share TSX-V. On December 5, 2023, upon completion of the Merger, NexGen’s ownership in IsoEnergy decreased from 48.7% immediately prior to the transaction to %, resulting in NexGen’s loss of control of IsoEnergy (Notes 8 and 17). NexGen retained significant influence over IsoEnergy, and the investment was recorded at its fair value on December 5, 2023, upon initial recognition. As at December 31, 2023 NexGen’s ownership in IsoEnergy was %.
Investments in Associates	(c) Investments in Associates Investments over which the Company exercises significant influence but does not control are associates. Investments in associates are accounted for using the equity method, except when classified as held for sale. The equity method involves recording the initial investment at cost and subsequently adjusting the carrying value of the investment for our proportionate share of the profit (loss), other comprehensive income (loss), and any other changes in the associates’ net assets, such as further investments or dividends. The proportionate share of the associate’s profit (loss) and other comprehensive income (loss) is based on the associate’s If the share of the associate’s losses were equal to or exceeded the investment in the associate, recognition of further losses would be discontinued. After the interest is reduced to zero, additional losses would be provided for and a liability recognized only to the extent that incurred legal or constructive obligations to provide additional funding or to make payments on behalf of the associate or joint venture exist. If the associate or joint venture subsequently reports profits, the Company would resume recognizing our share of those profits once there is a positive interest in the entity. At each balance sheet date, the Company considers whether there is objective evidence of an impairment in associates.
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 income (loss) and comprehensive income (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 income (loss) and comprehensive income (loss).
Leases	(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
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.
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 two years. Failure to expend such funds as required under the Canadian income tax legislation will result in a Part XII.6 tax to the Company on flow-through proceeds renounced under the “Look-back” Rule. If applicable, this tax is classified as an administration expense.
Earnings (loss) per share	(l) Earnings (loss) per share Basic earnings (loss) per share is calculated by dividing the earnings 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 earnings (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.
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 income (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 income (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 Company has elected to combine the host debt and conversion option and to measure the combined convertible debenture instruments at FVTPL (Note 10). (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 income (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 recogni z non-current, z

MATERIAL ACCOUNTING POLICIES (T

MATERIAL ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Company's Ownership Percentage in Each of Its Subsidiaries	The subsidiaries of the Company and their geographic locations at December 31, 2023 are as follows: Name of Subsidiary Location Percentage Ownership    NXE Energy Royalty Ltd. Canada 100% NXE Energy SW1 Ltd. Canada 100% NXE Energy SW3 Ltd. Canada 100%
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
	Dec. 31, 2023
Statement1 [Line Items]
Carrying value of marketable securities based on fair value explanatory.	The carrying value of marketable securities is based on the estimated fair value of the common shares and warrants, respectively determined using published closing share prices and the Black-Scholes option pricing model. 92 Energy Consolidated Uranium Latitude Uranium Shares Latitude Uranium Warrants Total  Fair value at December 31, 2022 $  4,253 $   1,458 $  64 $  - $ 5,775  Acquired during the period - - 1,581 419 2,000  Fair value adjustment (492) 378 (581) (205) (900)  Disposals due to deconsolidation of IsoEnergy (3,761) (1,836) (1,064) (214) (6,875)  Fair Value at December 31, 2023 $ -    $ -  $ - $  - $ -

EXPLORATION AND EVALUATION AS_2

EXPLORATION AND EVALUATION ASSETS (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Capitalized Costs on Projects	Rook I Other Athabasca Basin Properties  IsoEnergy  Properties Total  Acquisition Cost  Balance at December 31, 2022  $ 235 $ 1,458 $ 26,628 $ 28,321  Additions - 1 4 5  Disposals due to deconsolidation of IsoEnergy - - (26,632) (26,632)  Balance as at December 31, 2023  $ 235 $ 1,459   $ -  $ 1,694  Deferred exploration costs  Balance at December 31, 2022 329,012 9,603 38,312 376,927   Additions:  General exploration and drilling 6,488 7,574 5,514 19,576  Environmental, permitting, and engagement 17,583 - - 17,583  Technical, engineering and design 59,863 - 54 59,917  Geochemistry and assays - - 143 143  Geological and geophysical 323 2,978 2,732 6,033  Labour and wages 14,796 1,109 1,048 16,953  Share-based payments (Note 12) 5,605 - 1,262 6,867  Travel 954 - 303 1,257   Total Additions 105,612 11,661 11,056 128,329 Disposals due to deconsolidation of IsoEnergy (6,226) - (49,368) (55,594)  Balance as at December 31, 2023 $ 428,398  $ 21,264    $ -  $ 449,662  Total costs, December 31, 2023 $   428,633  $   22,723    $ -  $   451,356 Rook I Other Athabasca Basin Properties  IsoEnergy  Properties 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 - 837 9,655  Share-based payments (Note 12) 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

PROPERTY AND EQUIPMENT (Tables)

PROPERTY AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Detailed Information about Property, Plant and Equipment	Computer Equipment  Software Field Equipment and Vehicles Office, Furniture and Leasehold Improvements Road Total Cost As at December 31, 2021    $ 497 $  1,355   $ 6,645    $ 5,781  $ 2,079  $ 16,357 Additions 122 4 20 110 - 256 As at December 31, 2022    $ 619 $  1,359   $ 6,665    $ 5,891  $  2,079  $ 16,613 Additions 66 - 6,009 253 - 6,328 Disposals - - (101) - - (101) Transfer to lease receivable (Note 11(b)) - - (4,100) - - (4,100) Disposals due to deconsolidation of IsoEnergy - (65) (107) - - (172) Balance as at December 31, 2023    $ 685 $  1,294   $ 8,366    $ 6,144  $ 2,079  $  18,568 Accumulated Depreciation As at December 31, 2021   $ 427 $ 1,043   $ 4,180    $ 2,116   $ 1,972   $ 9,738 Depreciation 89 172 523 982 61 1,827 As at December 31, 2022   $ 516 $ 1,215   $ 4,703    $ 3,098   $ 2,033   $ 11,565 Depreciation 83 79 626 980 46 1,814 Disposals - - (81) - - (81) Disposals due to deconsolidation of IsoEnergy - (65) (69) - - (134) Balance as at December 31, 2023   $ 599 $ 1,229   $ 5,179     $ 4,078   $ 2,079   $ 13,164 Net book value at December 31,2022   $ 103 $ 144   $ 1,962     $ 2,793   $ 46    $ 5,048 Net book value at December 31, 2023   $ 86 $  65   $ 3,187     $ 2,066   $ -    $ 5,404

INVESTMENT IN ASSOCIATE (Tables

INVESTMENT IN ASSOCIATE (Tables)	12 Months Ended
	Dec. 31, 2023
Disclosure of associates [abstract]
Summary Of Investment In Associate	IsoEnergy Ltd.  Balance, December 31, 2022 $ -  Fair value of retained interest in IsoEnergy on December 5, 2023 239,735  Share of net income from associate 920  Share of other comprehensive income (loss) from associate (539)  Balance, December 31, 2023 $ 240,116  Fair value of investment in associate as at December 31, 2023 $  216,289
Summary Of Financial Information For Iso Energy	Summarized financial information for IsoEnergy Ltd. is as follows:    December 31, 2023 December 31, 2022 Cash $ 37,033 $ 19,913 Other current assets 1,192 212 Marketable securities 17,036 5,775 Non-current 291,937 71,215 Total assets $     347,198 $     97,115 Current liabilities 3,617 2,622 Non-current 40,561 28,273 Total liabilities $ 44,178 $ 30,895 Loss from operations $ 18,689 $ 7,375 Other comprehensive loss $ 2,618 $ 2,993 Total comprehensive loss $ 21,307 $ 10,368

FLOW-THROUGH SHARE PREMIUM LI_2

FLOW-THROUGH SHARE PREMIUM LIABILITY (Tables)	12 Months Ended
	Dec. 31, 2023
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:   2023     2022  Balance, beginning of year $   2,069 $ -  Liability incurred on flow-through shares issued - 2,115  Settlement of flow-though share liability on expenditures (2,069) (46)  Balance, end of year $ - $   2,069

CONVERTIBLE DEBENTURES (Tables)

CONVERTIBLE DEBENTURES (Tables)	12 Months Ended
	Dec. 31, 2023
Statement [LineItems]
Summary of Detailed Information about Convertible Debentures	2023 2020 2020 IsoEnergy Debentures 2022 IsoEnergy Debentures Total  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  Fair value on issuance 143,702 - - - 143,702  Fair value adjustment 14,776 20,158 13,938 1,305 50,177  Settlement with shares - (72,773) - - (72,773)  Disposals due to deconsolidation of IsoEnergy - - (36,207) (6,442) (42,649)  Fair Value at December 31, 2023 $ 158,478  $ -  $ -  $ - $  158,478
2023 Debentures
Statement [LineItems]
Summary of Detailed Information about Convertible Debentures, Valuation Assumptions	The inputs used in the pricing model as at December 31, 2023 and September 22, 2023 are as follows: December 31, 2023 September 22, 2023   Volatility 43.00% 45.00%  Expected life 4.7 years 5.0 years  Risk free interest rate 3.84% 4.63%  Expected dividend yield 0% 0%  Credit spread 16.60% 17.16%  Underlying share price of the Company US$7.00 US$6.12  Conversion exercise price US$6.76 US$6.76
2020 IsoEnergy Debentures
Statement [LineItems]
Summary of Detailed Information about Convertible Debentures, Valuation Assumptions	The inputs used in the pricing model as at December 4, 2023 and December 31, 2022 are as follows: December 4, 2023 December 31, 2022    Volatility 54.00% 52.80%  Expected life 1.7 years 2.6 years  Risk free interest rate 4.18% 4.27%  Expected dividend yield 0% 0%  Credit spread 22.22% 23.85%  Underlying share price of IsoEnergy $4.13 $2.91  Conversion exercise price $0.88 $0.88  Exchange rate (C$:US$) $0.739 $0.738
2022 IsoEnergy Debentures
Statement [LineItems]
Summary of Detailed Information about Convertible Debentures, Valuation Assumptions	The inputs used in the pricing model as at December 4, 2023 and December 31, 2022 are as follows: December 4, 2023 December 31, 2022   Expected Volatility 54.00%   52.80%  Expected life in years 4.0 years 4.9 years  Risk free interest rate 3.96% 3.76%  Expected dividend yield 0% 0%  Credit spread 22.22% 23.85%  Underlying share price of IsoEnergy $4.13 $2.91  Conversion exercise price $4.33 $4.33  Exchange rate (C$:US$) $0.739 $0.738

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2023
Presentation of leases for lessee [abstract]
Schedule of Right-of-use asset	December 31, 2023 December 31, 2022   Right-of-use  $   1,933  $   2,640  Additions 246 -  Depreciation (705) (707)  Balance, end of period  $ 1,474  $ 1,933
Schedule of discounted and undiscounted value of the remaining lease payments	The discounted and undiscounted value of the remaining lease payments as at December 31, 2023 is as follows: Less than 1 year 1 to 3 years 4 to 5 years Over 5 years  Total  Lease receivable $  512 $  769 $  1,025 $  1,708 $  4,014
Schedule of finance lease receivables current and non current.	December 31, 2023   December 31, 2022  Current portion 512 -  Non-current 3,502 -  Balance, end of period   $    4,014   $    -
Schedule of Lease obligation adoption	(c) Lease liabilities December 31, 2023   December 31, 2022  Lease liabilities, beginning of period   $    2,463   $ 3,169  Additions 254 -  Interest expense on lease liabilities 153 207  Payment of lease liabilities (928) (913)  Balance, end of period   $ 1,942   $ 2,463  Current portion 926 775  Non-current 1,016 1,688  Balance, end of period   $ 1,942   $    2,463
Schedule of Minimum future lease payments relating to the leased assets	(d) Amounts recognized in consolidated statements of net income (loss) Year ended December 31, 2023 2022  Expense relating to variable lease payments $    417  $    417

SHARE CAPITAL - (Tables)

SHARE CAPITAL - (Tables)	12 Months Ended
	Dec. 31, 2023
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, 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 49,638,890 $ 4.07   Granted 10,849,062 8.15   Exercised (8,608,816) 3.06   Forfeited (313,334) 5.51    At December 31, 2023 – Outstanding 51,565,802 $ 5.08    At December 31, 2023 – Exercisable 41,268,569 $ 4.52
Summary of Company's Stock Options Outstanding and Exercisable	The following table summarizes information about the exercisable share options outstanding as at December 31, 2023: Number of share options outstanding Number of share Exercise prices (C$) Remaining Expiry date   500,000 500,000 2.27 0.22 March 21, 2024 250,000 250,000 2.22 0.24 March 27, 2024 2,900,000 2,900,000 1.92 0.45 June 12, 2024 188,679 188,679 1.59 0.63 August 16, 2024 3,400,000 3,400,000 1.59 0.98 December 24, 2024 3,875,000 3,875,000 1.80 1.45 June 12, 2025 4,766,666 4,766,666 3.24 1.95 December 11, 2025 250,000 250,000 5.16 2.13 February 16, 2026 250,000 250,000 4.53 2.25 April 1, 2026 8,330,000 8,330,000 5.84 2.44 June 10, 2026 6,781,666 6,781,666 5.44 2.96 December 14, 2026 94,277 47,139 5.76 3.05 January 18, 2027 3,370,000 2,240,014 5.31 3.63 August 17, 2027 55,452 27,726 5.41 3.76 October 4, 2027 5,905,000 3,925,013 5.57 3.97 December 18, 2027 300,000 100,000 6.55 4.09 January 31, 2028 4,795,000 1,598,333 6.99 4.65 August 22, 2028 39,062 - 7.68 4.76 October 4, 2028 5,515,000 1,838,333 9.33 4.95 December 11, 2028 51,565,802 41,268,569
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,   2023 2022    Expected stock price volatility 61.24% 62.38%  Expected life of options 5 years 5 years  Risk free interest rate 3.67% 2.87%  Expected forfeitures 0% 0%  Expected dividend yield 0% 0%  Weighted average fair value per option granted in period $4.48 $3.01  Weighted average exercise price $8.15 $5.47

SUPPLEMENTAL CASH FLOW INFORM_2

SUPPLEMENTAL CASH FLOW INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary Of Detailed Information About Non Cash Investing And Financing Activities	a)  Schedule of non-cash Year ended December 31,  2023 2022    Capitalized share-based payments $ 6,867 $     6,364  Exploration and evaluation asset expenditures included in accounts payable and accrued liabilities   10,929 4,711   Interest expense included in accounts payable and accrued liabilities 773 85

RELATED PARTY TRANSACTIONS (Tab

RELATED PARTY TRANSACTIONS (Tables)	12 Months Ended
	Dec. 31, 2023
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, 2023  2022    Short-term compensation (1) $   7,317     $   5,379   Share-based payments (2) 33,319  32,210   Consulting fees (3) (4) 130  231  $  40,766     $  37,820  (1) (2) (3) (4) As at December 31, 2023, there was $43 (December 31, 2022 - $43) included in accounts payable and accrued liabilities owing to a director for compensation.

CAPITAL MANAGEMENT (Tables)

CAPITAL MANAGEMENT (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Disclosure Of Detailed Information About Management Capital Explanatory	Capital, as defined above, is summarized in the following table: December 31, 2023 December 31, 2022   Equity $     820,019 $     455,417   Convertible debentures (Note 10) 158,478 80,021  978,497 535,438   Less: Cash (290,743) (134,447)  $     687,754 $     400,991

FINANCIAL INSTRUMENTS AND RIS_2

FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary Of Maximum Exposure To Credit Risk	The Company’s maximum exposure to credit risk is as follows:  December 31, 2023    December 31, 2022   Cash $ 290,743   $ 134,447   Amounts receivable 1,940   1,801   Lease receivable 4,014   -  $ 296,697   $ 136,248
Summary Of Detailed Information About Siginificant Undiscounted Commitments	The Company’s significant undiscounted commitments at December 31, 2023 are as follows: Less than 1 year 1 to 3 years 4 to 5 years Over 5 years Total   Trade and other payables $  26,986  $     -  $    - $  -  $  26,986   Convertible debentures (Note 10) -    - 158,478 - 158,478   Lease liabilities (Note 11(c)) 1,476  1,476 - - 2,952  $  28,462  $  1,476  $  158,478 $  -  $ 188,416

EARNINGS (LOSS) PER SHARE (Tabl

EARNINGS (LOSS) PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Summary of Loss (Profit) Per Share	Basic net earnings (loss) per share provides a measure of the interests of each ordinary common share in the Company’s performance over the year. Diluted net earnings (loss) per share adjusts basic net income (loss) per share for the effect of all dilutive potential common shares. For the year ended December 31,   2023 2022    Basic earnings (loss) per share   Net income (loss) attributable to NexGen shareholders $  80,816 $  (56,587)     Weighted average number of common shares 498,243,824 479,680,438     Basic earnings (loss) per share $   0.16 $ (0.12)    Diluted earnings (loss) per share   Diluted earnings (loss) available to NexGen shareholders $  80,816 $ (56,587)     Weighted average number of common shares 498,243,824 479,680,438     Effect of share options on issue 14,698,606 -     Weighted average number of common shares (diluted) 529,214,619 479,680,438     Diluted earnings (loss) per share $ 0.16 $ (0.12)

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2023
Text block [abstract]
Reconciliation of Income Taxes at Statutory Rates	A reconciliation of income taxes at statutory rates with the reported taxes is as follows: 2023 2022    Net income (loss) for the year $    68,756  $   (61,310)    Statutory rate 27.00% 27.00%    Expected income tax expense (recovery) $    18,564  $   (16,554)    Permanent differences 7,617 9,662    Impact of renunciation of flow-through shares 1,328 30    Impact of (gain) loss recognized in other comprehensive income 328 (17)    Impact of loss on convertible debt 13,900 422    Impact on deconsolidation of IsoEnergy (27,361) -    Change in unrecognized deductible temporary differences (15,778) 5,412    Other (10) 3    Deferred income tax recovery $    (1,412)  $    (1,042)
Summary of Income Tax (Recovery) Expense	The Company’s income tax recovery is comprised of the following:    2023    2022   Deferred income tax recovery $ (1,412) $ (1,042)  Total $ (1,412) $ (1,042)
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:    2023    2022  Change in fair value of convertible debentures attributable to the change in credit risk $ (328) $ 17 Change in fair value of marketable securities (121) (478) Total $ (449) $ (461)
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:    2023    2022    Exploration and evaluation assets $ 46,658 $ 39,120   Convertible debentures 1,559 66   Non-capital (73,070) (38,333)   Investment in associate 24,853 -   Share issuance costs - (208)   Equipment - (79)   Marketable securities - 301  Net deferred tax liabilities $ - $ 867
Summary of Movement in Deferred Tax Liability	Movement in the Company’s deferred tax liability balance in the year is as follows:    2023    2022    Opening balance $ 867 $ 2,536    Recognized in income tax expense (recovery) 657 (996)   Recognized in OCI/equity (449) (673)   Disposal due to deconsolidation of IsoEnergy (1,075) -  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 2023 Expiry Date Range 2022 Expiry Date  Range    Non-capital $  96,732 2029 to 2043 $  144,633 2029 to 2042   Share issuance costs 13,748 - 7,156 -   Equipment 460 - 911 -   Donations 196 2024 to 2028 153 2023 to 2027 Tax attributes are subject to review, and potential adjustment, by tax authorities.

Reporting Entity - Additional I

Reporting Entity - Additional Information (Detail)			12 Months Ended
	Dec. 05, 2023	Dec. 04, 2023	Dec. 31, 2023	Dec. 31, 2022
IsoEnergy Ltd. [member]
Disclosure of reporting entity [line items]
Proportion of ownership interest in subsidiary	34%	48.70%	33.90%	50.10%

Nature of Operations - Addition

Nature of Operations - Additional Information (Detail) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Nature of operations [abstract]
Accumulated deficit	$ (304,004)	$ (389,867)
Working capital	$ 279,053

Material Accounting Policies -

Material Accounting Policies - Summary of Company's Ownership Percentage in Each of Its Subsidiaries (Detail)	12 Months Ended
	Dec. 31, 2023
NXE Energy Royalty Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100%
Location	Canada
NXE Energy SW1 Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100%
Location	Canada
NXE Energy SW3 Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	100%
Location	Canada

Material Accounting Policies _2

Material Accounting Policies - Additional Information (Detail) - shares			12 Months Ended
	Dec. 05, 2023	Dec. 04, 2023	Dec. 31, 2023	Dec. 31, 2022	Sep. 27, 2023
Disclosure of significant accounting policies [line items]
Flow through shares expended on property exploration period			two years
CUR Shares [Member]
Disclosure of significant accounting policies [line items]
Number of shares issued					0.5
Isoenergy Ltd [member]
Disclosure of significant accounting policies [line items]
Proportion of ownership interest in subsidiary	34%	48.70%	33.90%	50.10%

Material Accounting Policies _3

Material Accounting Policies - Summary of Depreciation Over the Estimated Useful Lives of Each Significant Component (Detail)	12 Months Ended
	Dec. 31, 2023
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

Material Accounting Policies _4

Material Accounting Policies - Schedule Of Accounting Policy For Financial Instruments (Detail)	12 Months Ended
	Dec. 31, 2023
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) $ in Thousands	12 Months Ended
	Dec. 31, 2023 CAD ($)
Disclosure Of Marketable Securities [line Items]
Fair value at December 31, 2022	$ 5,775
Acquired during the period	2,000
Fair value adjustment	(900)
Disposals due to deconsolidation of IsoEnergy	(6,875)
Fair Value at December 31, 2023	0
92 Energy
Disclosure Of Marketable Securities [line Items]
Fair value at December 31, 2022	4,253
Acquired during the period	0
Fair value adjustment	(492)
Disposals due to deconsolidation of IsoEnergy	(3,761)
Fair Value at December 31, 2023	0
Consolidated Uranium
Disclosure Of Marketable Securities [line Items]
Fair value at December 31, 2022	1,458
Acquired during the period	0
Fair value adjustment	378
Disposals due to deconsolidation of IsoEnergy	(1,836)
Fair Value at December 31, 2023	0
Latitude Uranium Sahres
Disclosure Of Marketable Securities [line Items]
Fair value at December 31, 2022	64
Acquired during the period	1,581
Fair value adjustment	(581)
Disposals due to deconsolidation of IsoEnergy	(1,064)
Fair Value at December 31, 2023	0
Latitude Uranium Warrants
Disclosure Of Marketable Securities [line Items]
Fair value at December 31, 2022	0
Acquired during the period	419
Fair value adjustment	(205)
Disposals due to deconsolidation of IsoEnergy	(214)
Fair Value at December 31, 2023	$ 0

Marketable Securities - Additio

Marketable Securities - Additional Information (Detail) $ in Thousands					12 Months Ended
	Jun. 19, 2023 $ / shares	Apr. 05, 2023 CAD ($)	Dec. 31, 2022 shares	Feb. 22, 2022 shares	Dec. 31, 2022 shares	Apr. 05, 2023 $ / shares shares
International Consolidated Uranium Inc [Member]
Disclosure Of Marketable Securities [line Items]
Number of shares valuation					900,000
Number of shares to be issued to spinout entity for each share held by consolidated entity pm prorata allotment				0.214778
92 Energy [Member]
Disclosure Of Marketable Securities [line Items]
Number of shares valuation					10,755,000
Latitude Uranium Shares [Member]
Disclosure Of Marketable Securities [line Items]
Stock shares received during the period shares			193,300
Iso Energy [Member] | International Consolidated Uranium Inc [Member]
Disclosure Of Marketable Securities [line Items]
Number of shares received by spinout entity				193,300
Iso Energy [Member] | Latitude Uranium Shares [Member]
Disclosure Of Marketable Securities [line Items]
Sale of stock received price per share | $ / shares						$ 0.35
Proportion of ownership interest in subsidiary	100%
Class Of Warrants Exercisable Price Per Share | $ / shares	$ 0.5
Cash Proceeds On Subscribed Shares | $		$ 2,000
Number Of Shares Subscribed						5,714,300

Exploration and Evaluation As_3

Exploration and Evaluation Assets - Summary of Capitalized Costs on Projects (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	$ 405,248
Exploration and evaluation assets, ending balance	451,356	$ 405,248
Acquisition cost [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	28,321	28,353
Additions	5	10
Disposals due to deconsolidation of IsoEnergy	(26,632)
Dispositions		(42)
Exploration and evaluation assets, ending balance	1,694	28,321
Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	376,927	298,190
Expense arising from exploration for and evaluation of mineral resources	128,329	78,737
Disposals due to deconsolidation of IsoEnergy	(55,594)
Exploration and evaluation assets, ending balance	449,662	376,927
Rook 1 Property [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	329,247
Exploration and evaluation assets, ending balance	428,633	329,247
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
Disposals due to deconsolidation of IsoEnergy	0
Dispositions		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	329,012	260,941
Expense arising from exploration for and evaluation of mineral resources	105,612	68,071
Disposals due to deconsolidation of IsoEnergy	(6,226)
Exploration and evaluation assets, ending balance	428,398	329,012
Other Athabasca Basin Properties [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	11,061
Exploration and evaluation assets, ending balance	22,723	11,061
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	1	0
Disposals due to deconsolidation of IsoEnergy	0
Dispositions		0
Exploration and evaluation assets, ending balance	1,459	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	9,603	9,180
Expense arising from exploration for and evaluation of mineral resources	11,661	423
Disposals due to deconsolidation of IsoEnergy	0
Exploration and evaluation assets, ending balance	21,264	9,603
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	19,576	13,318
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	6,488	7,705
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	7,574	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	17,583	12,005
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	17,583	12,005
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	59,917	32,703
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	59,863	32,703
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	143	190
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	6,033	3,957
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	323	1,941
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	2,978	423
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	16,953	9,655
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	14,796	8,818
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	1,109	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	6,867	6,364
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	5,605	4,532
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	1,257	545
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	954	367
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	64,940
Exploration and evaluation assets, ending balance	0	64,940
IsoEnergy Ltd. [member] | Acquisition cost [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	26,628	26,660
Additions	4	10
Disposals due to deconsolidation of IsoEnergy	(26,632)
Dispositions		(42)
Exploration and evaluation assets, ending balance	0	26,628
IsoEnergy Ltd. [member] | Deferred Exploration Costs [member]
Disclosure of exploration and expenditure assets [line items]
Exploration and evaluation assets, beginning balance	38,312	28,069
Expense arising from exploration for and evaluation of mineral resources	11,056	10,243
Disposals due to deconsolidation of IsoEnergy	(49,368)
Exploration and evaluation assets, ending balance	0	38,312
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	5,514	5,613
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	0
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	54	0
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	143	190
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	2,732	1,593
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	1,048	837
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	1,262	1,832
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	$ 303	$ 178

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, 2023	Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	$ 5,048
Balance at end of year	5,404	$ 5,048
At Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	16,613	16,357
Additions	6,328	256
Disposals	(101)
Transfer to lease receivable	(4,100)
Disposals due to deconsolidation of IsoEnergy	(172)
Balance at end of year	18,568	16,613
Accumulated Depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	11,565	9,738
Disposals	(81)
Depreciation	1,814	1,827
Disposals due to deconsolidation of IsoEnergy	(134)
Balance at end of year	13,164	11,565
Software [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	144
Balance at end of year	65	144
Software [member] | At Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	1,359	1,355
Additions	0	4
Transfer to lease receivable	0
Disposals due to deconsolidation of IsoEnergy	(65)
Balance at end of year	1,294	1,359
Software [member] | Accumulated Depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	1,215	1,043
Depreciation	79	172
Disposals due to deconsolidation of IsoEnergy	(65)
Balance at end of year	1,229	1,215
Computer Equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	103
Balance at end of year	86	103
Computer Equipment [member] | At Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	619	497
Additions	66	122
Transfer to lease receivable	0
Disposals due to deconsolidation of IsoEnergy	0
Balance at end of year	685	619
Computer Equipment [member] | Accumulated Depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	516	427
Depreciation	83	89
Disposals due to deconsolidation of IsoEnergy	0
Balance at end of year	599	516
Field Equipment and Vehicles [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	1,962
Balance at end of year	3,187	1,962
Field Equipment and Vehicles [member] | At Cost [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	6,665	6,645
Additions	6,009	20
Disposals	(101)
Transfer to lease receivable	(4,100)
Disposals due to deconsolidation of IsoEnergy	(107)
Balance at end of year	8,366	6,665
Field Equipment and Vehicles [member] | Accumulated Depreciation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	4,703	4,180
Disposals	(81)
Depreciation	626	523
Disposals due to deconsolidation of IsoEnergy	(69)
Balance at end of year	5,179	4,703
Office Furniture and Leasehold Improvements [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	2,793
Balance at end of year	2,066	2,793
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	5,891	5,781
Additions	253	110
Disposals	0
Transfer to lease receivable	0
Disposals due to deconsolidation of IsoEnergy	0
Balance at end of year	6,144	5,891
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	3,098	2,116
Disposals	0
Depreciation	980	982
Disposals due to deconsolidation of IsoEnergy	0
Balance at end of year	4,078	3,098
Road [member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance at beginning of year	46
Balance at end of year	0	46
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
Transfer to lease receivable	0
Disposals due to deconsolidation of IsoEnergy	0
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	2,033	1,972
Depreciation	46	61
Disposals due to deconsolidation of IsoEnergy	0
Balance at end of year	$ 2,079	$ 2,033

Investment In Associate - Summa

Investment In Associate - Summary Of Investment In Associate (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share of income during the period
Balance, December 31, 2022	$ 0
Share of net income from associate	920	$ 0
Share of other comprehensive income (loss) from associate	539	0
Balance, December 31, 2023	240,116	0
IsoEnergy Ltd. [member]
Share of income during the period
Balance, December 31, 2022	0
Fair value of retained interest in IsoEnergy on December 5, 2023	239,735
Share of net income from associate	920
Share of other comprehensive income (loss) from associate	(539)
Balance, December 31, 2023	240,116	$ 0
Fair value of investment in associate as at December 31, 2023	$ 216,289

Investment In Associate - Sum_2

Investment In Associate - Summary Of Financial Information For Iso Energy (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Detailed Information About Financial Information [Line Items]
Cash	$ 290,743	$ 134,447	$ 201,804
Marketable securities	0	5,775
Total assets	1,007,425	554,560
Current liabilities	27,912	16,567
Total liabilities	187,406	99,143
Loss from operations	70,168	(60,268)
Other comprehensive loss	(2,422)	(2,930)
Total comprehensive loss	67,746	(63,198)
IsoEnergy Ltd. [member]
Disclosure Of Detailed Information About Financial Information [Line Items]
Cash	37,033	19,913
Other current assets	1,192	212
Marketable securities	17,036	5,775
Non-current assets	291,937	71,215
Total assets	347,198	97,115
Current liabilities	3,617	2,622
Non-current liabilities	40,561	28,273
Total liabilities	44,178	30,895
Loss from operations	18,689	7,375
Other comprehensive loss	2,618	2,993
Total comprehensive loss	$ 21,307	$ 10,368

Flow-through share premium li_3

Flow-through share premium liability - Additional Information (Detail) $ in Thousands	Dec. 31, 2023 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, 2023	Dec. 31, 2022
FLOWTHROUGH SHARE PREMIUM LIABILITY [Abstract]
Balance, beginning of the year	$ 2,069	$ 0
Liability incurred on flow-through shares issued	0	2,115
Settlement of flow-though share liability on expenditures	(2,069)	(46)
Balance, end of the year	$ 0	$ 2,069

Convertible Debentures - Summar

Convertible Debentures - Summary of Detailed Information about Convertible Debentures (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Convertible debentures [line items]
Beginning	$ 80,021	$ 72,011
Fair value on issuance	143,702	5,296
Fair value adjustment	50,177	2,714
Settlement with shares	(72,773)
Disposals due to deconsolidation of IsoEnergy	(42,649)
Ending	158,478	80,021
2023 Debentures [member]
Convertible debentures [line items]
Fair value on issuance	143,702
Fair value adjustment	14,776
Ending	158,478
2020 Debentures [member]
Convertible debentures [line items]
Beginning	52,615	46,910
Fair value adjustment	20,158	5,705
Settlement with shares	(72,773)
Ending		52,615
2020 IsoEnergy Debentures
Convertible debentures [line items]
Beginning	22,269	25,101
Fair value adjustment	13,938	(2,832)
Disposals due to deconsolidation of IsoEnergy	(36,207)
Ending		22,269
2022 IsoEnergy Debentures
Convertible debentures [line items]
Beginning	5,137
Fair value on issuance		5,296
Fair value adjustment	1,305	(159)
Disposals due to deconsolidation of IsoEnergy	$ (6,442)
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. 11, 2023 CAD ($) shares	Dec. 05, 2023 CAD ($) shares	Dec. 04, 2023	Sep. 28, 2023 CAD ($) shares	Sep. 22, 2023 CAD ($) shares	Sep. 22, 2023 USD ($) $ / shares shares	Jun. 09, 2023 CAD ($) shares	Dec. 09, 2022 CAD ($) shares	Dec. 06, 2022 CAD ($)	Dec. 06, 2022 USD ($) shares	Jun. 10, 2022 CAD ($) shares	Dec. 31, 2023 CAD ($) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 CAD ($)	Sep. 28, 2023 USD ($)	Sep. 28, 2023 $ / shares	Dec. 06, 2022 $ / shares	Aug. 18, 2020 USD ($) shares	Aug. 18, 2020 $ / shares
Convertible debentures [line items]
Interest rate												9%
Stock issued during period shares | shares	113,803						46,038	42,328			42,252
Stock issued during value	$ 1,064						$ 270	$ 235			$ 251	$ 1,498		$ 486
2020 Debentures [member]
Convertible debentures [line items]
Debentures increased															$ 15,000
Interest rate														7.50%
Convertible debentures term				May 27, 2025
Shares issued on conversion of convertible debentures | shares				8,663,461
Stock issued during period related to accrued and unpaid interest | shares				19,522
Loss on conversion reclassified to accumulated deficit				$ 361
Closing share price | $ / shares																$ 8.4
2023 Debentures
Convertible debentures [line items]
Gross proceeds from issuance of convertible debentures					$ 148,145	$ 110,000
Establishment fee, percent					3%	3%
Establishment fee					$ 4,443	$ 3,300
Establishment fee (shares) | shares					634,615	634,615
Fair value on the issue date					$ 143,702	$ 106,700
Convertible debentures face value						$ 110,000
Convertible debentures term					5.0 years	5.0 years						4.7 years	4.7 years
Stock issued during period shares | shares												113,803	113,803
Stock issued during value												$ 1,064	$ 724
Interest expense on bonds												1,967	$ 1,448
Debt instrument convertible maximum shares issuable on conversion of debt | shares					16,272,189	16,272,189
Debt instrument conversion price per share | $ / shares						$ 6.76
2020 IsoEnergy Debentures
Convertible debentures [line items]
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			1.7 years											2.6 years
Stock issued during period shares | shares		34,722
Stock issued during value		$ 100
Interest expense on bonds		$ 239
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
Fair value on the issue date									$ 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
Convertible debentures term			4.0 years											4.9 years
Stock issued during period shares | shares		23,148
Stock issued during value		$ 67
Interest expense on bonds		$ 199
Convertible debentures [member]
Convertible debentures [line items]
Comprehensive income (loss)												1,432		$ 149
Debentures increased												158,478		80,021
Gains (losses) recognised in profit or loss, fair value measurement, liabilities												48,745		2,863
Mark-to-market loss on convertible debentures (Note 9)												50,177		2,714
Interest expense on convertible debentures												$ 6,098		$ 2,179

Convertible Debentures - Summ_2

Convertible Debentures - Summary of Detailed Information about Convertible Debentures, Valuation Assumptions (Detail)			12 Months Ended
	Dec. 04, 2023 $ / shares	Sep. 22, 2023 $ / shares	Dec. 31, 2023 $ / shares	Dec. 31, 2022 $ / shares
2023 Debentures
Convertible debentures [line items]
Volatility		45%	43%
Expected life in years		5.0 years	4.7 years
Risk free interest rate		4.63%	3.84%
Expected dividend yield		0%	0%
Credit spread		17.16%	16.60%
Underlying Share Prices		$ 6.12	$ 7
Conversion exercise price		$ 6.76	$ 6.76
2020 IsoEnergy Debentures
Convertible debentures [line items]
Volatility	54%			52.80%
Expected life in years	1.7 years			2.6 years
Risk free interest rate	4.18%			4.27%
Expected dividend yield	0%			0%
Credit spread	22.22%			23.85%
Underlying Share Prices	$ 4.13			$ 2.91
Conversion exercise price	$ 0.88			$ 0.88
Exchange rate (C$:US$)	0.739			0.738
2022 IsoEnergy Debentures
Convertible debentures [line items]
Volatility	54%			52.80%
Expected life in years	4.0 years			4.9 years
Risk free interest rate	3.96%			3.76%
Expected dividend yield	0%			0%
Credit spread	22.22%			23.85%
Underlying Share Prices	$ 4.13			$ 2.91
Conversion exercise price	$ 4.33			$ 4.33
Exchange rate (C$:US$)	0.739			0.738

Leases - Schedule of Right-of-u

Leases - Schedule of Right-of-use asset (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of quantitative information about right-of-use assets [line items]
Right-of-use assets, beginning of period	$ 1,933	$ 2,640
Additions	246	0
Depreciation	(705)	(707)
Balance, end of period	$ 1,474	$ 1,933

Leases - Schedule of discounted

Leases - Schedule of discounted and undiscounted value of the remaining lease payments (Detail) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Disclosure of maturity analysis of finance lease payments receivable [line items]
Lease receivable	$ 4,014	$ 0
Less than 1 year
Disclosure of maturity analysis of finance lease payments receivable [line items]
Lease receivable	512
1 to 3 years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Lease receivable	769
4 to 5 years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Lease receivable	1,025
Over 5 years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Lease receivable	$ 1,708

Leases - Schedule of finance le

Leases - Schedule of finance lease receivables current and non current (Detail) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Disclosure of maturity analysis of finance lease payments receivable [line items]
Current portion	$ 512	$ 0
Non-current portion	3,502	0
Balance, end of period	$ 4,014	$ 0

Leases - Schedule of Lease obli

Leases - Schedule of Lease obligation adoption (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Detailed Information About Lease Liabilities [Line Items]
Lease liabilities, beginning of period	$ 2,463	$ 3,169
Additions	254
Interest expense on lease liabilities	153	207
Payment of lease liabilities	(928)	(913)
Balance, end of period	1,942	2,463
Current portion	926	775
Non-current portion	$ 1,016	$ 1,688

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, 2023	Dec. 31, 2022
Presentation of leases for lessee [abstract]
Expense relating to variable lease payments	$ 417	$ 417

Leases - Additional Information

Leases - Additional Information (Detail) - CAD ($) $ in Thousands		12 Months Ended
	Apr. 05, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement [LineItems]
Payment of short term lease expenses		$ 1,909	$ 3,205
Right-of-use assets		1,474	1,933	$ 2,640
Undiscounted operating lease payments		2,952	3,920
Expenses on short term leases expensed		102
Purchase of property plant and equipment classified as investing activities		6,066	354
Purchase Agreement For Finance Lease Receivable [Member]
Statement [LineItems]
Purchase of property plant and equipment classified as investing activities	$ 4,100
Corporate Office Leases [Member]
Statement [LineItems]
Right-of-use assets		$ 1,474	$ 1,933

Share Capital - Additional Info

Share Capital - Additional Information (Detail) $ / shares in Units, $ in Thousands, $ in Thousands									12 Months Ended
	Dec. 11, 2023 CAD ($) shares	Dec. 09, 2023 CAD ($) $ / shares shares	Sep. 28, 2023 CAD ($) shares	Sep. 22, 2023 CAD ($) shares	Sep. 22, 2023 USD ($) shares	Jun. 09, 2023 CAD ($) shares	Dec. 09, 2022 CAD ($) shares	Jun. 10, 2022 CAD ($) shares	Dec. 31, 2023 CAD ($) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 CAD ($) shares	Jan. 06, 2023 CAD ($)
Disclosure of classes of share capital [line items]
Stock Issued During Period, Shares, Stock Options Exercised | shares									8,608,816	8,608,816
Proceeds from exercise of stock options									$ 26,349
Options exercised, shares | shares											3,247,332
Exercise of options									(26,349)		$ (10,001)
Common shares issued | shares	113,803					46,038	42,328	42,252
Issue of shares on convertible debenture interest payment	$ 1,064					$ 270	$ 235	$ 251	1,498		$ 486
Percentage of issued and outstanding shares acquired											20%
Options granted, maximum term											10 years
Share-based payments (Note 12)									$ 37,142		$ 35,146
Equity Distribution Agreement At The Market Programme January Two Thousand And Twenty Three [Member]
Disclosure of classes of share capital [line items]
Proceeds from the issue of ordinary shares		$ 182,066
Payment for share issue costs		$ 6,890
Average share price | $ / shares		$ 7.36
Increase decrease in the shares issued during the period | shares		24,724,125
Common Stock Shares Subscribed But Not Issued Value												$ 250,000
Equity Distribution Agreement At The Market Programme January Two Thousand And Twenty Three [Member] | Commission Fees [Member]
Disclosure of classes of share capital [line items]
Share issuance costs		$ 3,704
Equity Distribution Agreement At The Market Programme January Two Thousand And Twenty Three [Member] | Other Transaction Costs [Member]
Disclosure of classes of share capital [line items]
Share issuance costs		$ 3,186
Equity Distribution Agreement At The Market Programme December Two Thousand And Twenty Three [Member]
Disclosure of classes of share capital [line items]
Common Stock Shares Subscribed But Not Issued Value	$ 500,000
2020 Debentures [member]
Disclosure of classes of share capital [line items]
Sale of stock issue price per share | shares			8,663,461
Stock issued during the period value conversion of debentures			$ 72,773
Stock issued during period related to accrued and unpaid interest | shares			19,522
Stock issued during period value related to accrued and unpaid interest			$ 164
2023 Debentures [member]
Disclosure of classes of share capital [line items]
Common shares issued | shares									113,803	113,803
Issue of shares on convertible debenture interest payment									$ 1,064	$ 724
Establishment fee (shares) | shares				634,615	634,615
Establishment fee				$ 4,443	$ 3,300
Included in exploration and evaluation assets [member]
Disclosure of classes of share capital [line items]
Capitalized to exploration and evaluation assets									6,867		6,364
Expensed to the statement of loss profit and comprehensive loss profit [member]
Disclosure of classes of share capital [line items]
Share-based payments (Note 12)									37,142		35,146
Reserves [member]
Disclosure of classes of share capital [line items]
Exercise of options									16,288		6,260
Expense from equity settled share based payment transactions									$ 44,009		$ 41,510

Share Capital - Summary of Stoc

Share Capital - Summary of Stock Option Transactions and the Number of Stock Options (Detail)	12 Months Ended
	Dec. 31, 2023 $ / shares	Dec. 31, 2022 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Number of Stock Options Outstanding, Beginning Balance	49,638,890	43,436,494
Number of Stock Options, Granted	10,849,062	9,744,729
Number of Stock Options, Exercised	(8,608,816)	(3,247,332)
Number of Stock Options, Expired		(65,000)
Number of Stock Options, Forfeited	(313,334)	(230,001)
Number of Stock Options Outstanding, Ending Balance	51,565,802	49,638,890
Number of Stock Options Outstanding, Number of options exercisable	41,268,569
Weighted Average Exercise Price Outstanding, Beginning Balance	$ 4.07	$ 3.69
Weighted Average Exercise Price, Granted	8.15	5.47
Weighted Average Exercise Price, Exercised	3.06	3.08
Weighted Average Exercise Price, Expired		5.52
Weighted Average Exercise Price, Forfeited	5.51	5.33
Weighted Average Exercise Price Outstanding, Ending Balance	5.08	$ 4.07
Weighted Average Exercise Price Outstanding, Number of options exercisable	$ 4.52

Share Capital - Summary of Comp

Share Capital - Summary of Company's Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
	Dec. 31, 2023 $ / shares	Dec. 31, 2022 $ / shares	Dec. 31, 2021 $ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	51,565,802	49,638,890	43,436,494
Number of share options exercisable	41,268,569
Exercise Price	$ 5.08	$ 4.07	$ 3.69
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	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	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	2,900,000
Number of share options exercisable	2,900,000
Exercise Price	$ 1.92
Remaining Contractual Life	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	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	3,400,000
Number of share options exercisable	3,400,000
Exercise Price	$ 1.59
Remaining Contractual Life	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	1 year 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	4,766,666
Number of share options exercisable	4,766,666
Exercise Price	$ 3.24
Remaining Contractual Life	1 year 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	250,000
Exercise Price	$ 5.16
Remaining Contractual Life	2 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	250,000
Number of share options exercisable	250,000
Exercise Price	$ 4.53
Remaining Contractual Life	2 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	8,330,000
Number of share options exercisable	8,330,000
Exercise Price	$ 5.84
Remaining Contractual Life	2 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	6,781,666
Number of share options exercisable	6,781,666
Exercise Price	$ 5.44
Remaining Contractual Life	2 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
Number of share options exercisable	47,139
Exercise Price	$ 5.76
Remaining Contractual Life	3 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	3,370,000
Number of share options exercisable	2,240,014
Exercise Price	$ 5.31
Remaining Contractual Life	3 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
Number of share options exercisable	27,726
Exercise Price	$ 5.41
Remaining Contractual Life	3 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	5,905,000
Number of share options exercisable	3,925,013
Exercise Price	$ 5.57
Remaining Contractual Life	3 years 11 months 19 days
Expiry Date	Dec. 18, 2027
6.55 Exercise Price Expire on January 31, 2028 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	300,000
Number of share options exercisable	100,000
Exercise Price	$ 6.55
Remaining Contractual Life	4 years 1 month 2 days
Expiry Date	Jan. 31, 2028
6.99 Exercise Price Expire on August 22, 2028 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	4,795,000
Number of share options exercisable	1,598,333
Exercise Price	$ 6.99
Remaining Contractual Life	4 years 7 months 24 days
Expiry Date	Aug. 22, 2028
7.68 Exercise Price Expire on October 4, 2028 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	39,062
Exercise Price	$ 7.68
Remaining Contractual Life	4 years 9 months 3 days
Expiry Date	Oct. 04, 2028
9.33 Exercise Price Expire on December 11, 2028 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Number of share options outstanding	5,515,000
Number of share options exercisable	1,838,333
Exercise Price	$ 9.33
Remaining Contractual Life	4 years 11 months 12 days
Expiry Date	Dec. 11, 2028

Share Capital - Summary of Weig

Share Capital - Summary of Weighted Average Grant Date Fair Values (Detail)	12 Months Ended
	Dec. 31, 2023 CAD ($) yr $ / shares	Dec. 31, 2022 CAD ($) yr $ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Expected stock price volatility	61.24%	62.38%
Expected life of options | yr	5	5
Risk free interest rate	3.67%	2.87%
Expected forfeitures	0%	0%
Expected dividend yield	0%	0%
Weighted average fair value per option granted | $	$ 4.48	$ 3.01
Weighted average exercise price | $ / shares	$ 8.15	$ 5.47

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, 2023	Dec. 31, 2022
Text block [abstract]
Capitalized share-based payments	$ 6,867	$ 6,364
Exploration and evaluation asset expenditures included in accounts payable and accrued liabilities	10,929	4,711
Interest expense included in accounts payable and accrued liabilities	$ 773	$ 85

Supplemental Cash Flow Inform_4

Supplemental Cash Flow Information - Additional Information (Detail) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
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, 2023	Dec. 31, 2022
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]	$ 7,317	$ 5,379
Key management personnel compensation, share-based payment	[2]	33,319	32,210
Key management personnel compensation, consulting fees	[3],[4]	130	231
Remuneration attributed to key management personnel		$ 40,766	$ 37,820
[1]Short-term compensation to key management personnel for the year ended December 31, 2023 amounted to $7,317 (2022 - $5,379) of which $7,100 (2022 - $5,148) was expensed and included in salaries, benefits, and directors’ fees on the statement of net income (loss) and comprehensive income (loss). The remaining $217 (2022 - $231) was capitalized to exploration and evaluation assets.[2]Share-based payments to key management personnel for the year ended December 31, 2023 amounted to $33,319 (2022 - $32,210) of which $32,793 (2022 - $31,826) was expensed and $526 (2022 - $384) 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, 2023 amounting to $130 (2022 - $130).[4]The Company used consulting services from a company associated with one of its former employees in relation to various studies for the year ended December 31, 2023 amounting to $nil (2022 - $101).

Related Party Transactions - _2

Related Party Transactions - Disclosure of Information About Key Management Personnel (Parenthetical) (Detail) - CAD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
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]	$ 7,317	$ 5,379
Key management personnel compensation, share-based payment	[2]	33,319	32,210
Key management personnel compensation, consulting fees	[3],[4]	130	231
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		0	101
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		7,100	5,148
Key management personnel compensation, share-based payment		32,793	31,826
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		217	231
Key management personnel compensation, share-based payment		$ 526	$ 384
[1]Short-term compensation to key management personnel for the year ended December 31, 2023 amounted to $7,317 (2022 - $5,379) of which $7,100 (2022 - $5,148) was expensed and included in salaries, benefits, and directors’ fees on the statement of net income (loss) and comprehensive income (loss). The remaining $217 (2022 - $231) was capitalized to exploration and evaluation assets.[2]Share-based payments to key management personnel for the year ended December 31, 2023 amounted to $33,319 (2022 - $32,210) of which $32,793 (2022 - $31,826) was expensed and $526 (2022 - $384) 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, 2023 amounting to $130 (2022 - $130).[4]The Company used consulting services from a company associated with one of its former employees in relation to various studies for the year ended December 31, 2023 amounting to $nil (2022 - $101).

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
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	$ 43

Capital Management - Summary of

Capital Management - Summary of Disclosure Of Detailed Information About Management Capital Explanatory (Detail) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Text block [abstract]
Equity	$ 820,019	$ 455,417	$ 461,348
Convertible debentures (Note 10)	158,478	80,021
Equity And Convertible Debentures	978,497	535,438
Less: Cash	(290,743)	(134,447)	$ (201,804)
Management Capital	$ 687,754	$ 400,991

Financial Instruments And Ris_3

Financial Instruments And Risk Management - Summary Of Maximum Exposure To Credit Risk (Detail) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of credit risk exposure [abstract]
Cash	$ 290,743	$ 134,447	$ 201,804
Amounts receivable	1,940	1,801
Lease receivable	4,014	0
Maximum exposure to credit risk	$ 296,697	$ 136,248

Financial Instruments And Ris_4

Financial Instruments And Risk Management - Summary of Detailed Information About Significant Undiscounted Commitments (Detail) $ in Thousands	Dec. 31, 2023 CAD ($)
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	$ 188,416
Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	28,462
1 to 3 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	1,476
4 to 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	158,478
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	26,986
Trade And Other Payables | Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	26,986
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	158,478
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	0
Convertible debentures [member] | 4 to 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	158,478
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	2,952
Lease Liabilities | Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	1,476
Lease Liabilities | 1 to 3 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	1,476
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, 2023 CAD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CAD ($)
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	$ 290,743
Current liabilities	$ 27,912		$ 16,567
Convertible debentures, aggregate principal amount		$ 110,000
Borrowings, interest rate	9%	9%
Amounts held in foreign risk [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, net		$ 81,006
Percentage of reasonably possible change in currency rates	10%
Value at risk	$ 10,728

Non-controlling Interests - Add

Non-controlling Interests - Additional Information (Detail) - CAD ($)				12 Months Ended
	Dec. 05, 2023	Dec. 04, 2023	Oct. 19, 2023	Dec. 31, 2023	Dec. 31, 2022
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	34%	48.70%		33.90%	50.10%
Proportion of minority interest in subsidiary	48.70%			34%
Non controlling interest derecognized during the period				$ 35,697,000
Retained investment in subsidiary at fair value				239,735,000
Portion of gains losses recognized when control of subisidiarty is lost attributable to recognizing investment retained				$ 204,038,000
Share Price Considered For Calculating Fair Value	$ 4.09
IsoEnergy Ltd. [member] | Subscription Receipts [Member]
Disclosure of noncontrolling interests [line items]
Class of warrants or rights issued during the period units			8,134,500
Class of warrants or rights issue price per unit			$ 4.5
Investment in warrants during the period shares			3,333,350
Per share price of investment in warrant			$ 4.5
Investment in warrants during the period value			$ 15,000,000
Warrants converted into shares during the period shares	3,333,350

Earnings (Loss) Per Share - Sum

Earnings (Loss) Per Share - Summary Of Loss (Profit) Per Share (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023 CAD ($) $ / shares shares	Dec. 31, 2023 $ / shares	Dec. 31, 2022 CAD ($) $ / shares shares	Dec. 31, 2022 $ / shares
Basic earnings (loss) per share
Net income (loss) attributable to NexGen shareholders | $	$ 80,816		$ (56,587)
Weighted average number of common shares	498,243,824		479,680,438
Basic earnings (loss) per share | (per share)	$ 0.16	$ 0.16	$ (0.12)	$ (0.12)
Diluted earnings (loss) per share
Diluted earnings (loss) available to NexGen shareholders | $	$ 80,816		$ (56,587)
Weighted average number of common shares	498,243,824		479,680,438
Effect of share options on issue	14,698,606
Weighted average number of common shares (diluted)	529,214,619		479,680,438
Diluted earnings (loss) per share | (per share)	$ 0.16	$ 0.16	$ (0.12)	$ (0.12)

Earnings (Loss) Per Share - Add

Earnings (Loss) Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share options [member]
Earnings per share [line items]
Number of instruments that are antidilutive in period presented	10,349,062	0

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Income Taxes at Statutory Rates (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Net income (loss) for the year	$ 68,756	$ (61,310)
Statutory rate	27%	27%
Expected income tax expense (recovery)	$ 18,564	$ (16,554)
Permanent differences	7,617	9,662
Impact of renunciation of flow-through shares	1,328	30
Impact of (gain) loss recognized in other comprehensive income	328	(17)
Impact of loss on convertible debt	13,900	422
Impact on deconsolidation of IsoEnergy	(27,361)	0
Change in unrecognized deductible temporary differences	(15,778)	5,412
Other	(10)	3
Deferred income tax recovery	$ (1,412)	$ (1,042)

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax (Recovery) Expense (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Major components of tax expense (income) [abstract]
Deferred income tax expense (recovery)	$ (1,412)	$ (1,042)

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, 2023	Dec. 31, 2022
Disclosure Of Change In Fair Value of Convertible Debentures Attributable To Credit Risk Fluctuation [Line Items]
Deferred income tax recovery	$ (449)	$ (461)
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	(328)	17
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	$ (121)	$ (478)

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Tax (Assets) and Liabilities (Detail) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	$ 0	$ 867	$ 2,536
Exploration and evaluation assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	46,658	39,120
Convertible debentures [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	1,559	66
Non-capital losses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	(73,070)	(38,333)
Investment in associate [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	24,853	0
Share issuance costs [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	0	(208)
Equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liabilities	0	(79)
Marketable Securities [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Marketable securities	$ 0	$ 301

Income Taxes - Summary of Movem

Income Taxes - Summary of Movement in Deferred Tax Liability (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Changes in deferred tax liability (asset) [abstract]
Opening balance	$ 867	$ 2,536
Recognized in income tax expense (recovery)	657	(996)
Recognized in OCI/equity	(449)	(673)
Disposal due to deconsolidation of IsoEnergy	(1,075)	0
Net deferred tax liability	$ 0	$ 867

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, 2023	Dec. 31, 2022
Non-capital losses available for future periods [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary Differences	$ 96,732	$ 144,633
Expiry Date	2029 to 2043	2029 to 2042
Share issuance costs [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary Differences	$ 13,748	$ 7,156
Equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary Differences	460	911
Donations [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary Differences	$ 196	$ 153
Expiry Date	2024 to 2028	2023 to 2027

Subsequent Event - Additional I

Subsequent Event - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 CAD ($) shares $ / shares	Dec. 31, 2023 CAD ($)	Dec. 31, 2022 CAD ($)
Subsequent Events [Line Items]
Number of share options exercised		8,608,816	3,247,332
Increase decrease through exercise of options		$ (26,349)	$ (10,001)
Major ordinary share transactions [member]
Subsequent Events [Line Items]
Net proceeds from issue of ordinary shares	$ 130,200
Other transaction costs on share issuance	$ 3,500
Shares issued during period | shares	13,000,800
Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise | $ / shares	$ 10.38
Gross Proceeds From Issue Of Ordinary Shares	$ 135,000
Commissions during shares issued	$ 1,300
Issue Of Shares On Exercise Of Stock Options [Member]
Subsequent Events [Line Items]
Number of share options exercised | shares	1,208,332
Increase decrease through exercise of options	$ 4,035