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Income Taxes - Deferred income tax assets (liabilities) rollforward (Details) - CAD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of Deferred Income Tax Assets (Liabilities) [Line Items] |  |
Deferred income tax assets-gross | $ 53,434 | $ 65,306
Set-off against deferred income tax liabilities | (53,434) | (65,306)
Deferred income tax assets-per balance sheet | 0 | 0
Deferred tax assets and liabilities [abstract] |  |
Deferred income tax liabilities-gross | (55,805) | (67,913)
Set-off of deferred income tax assets | 53,434 | 65,306
Deferred income tax liabilities-per balance sheet | (2,371) | (2,607)
Other |  |
Disclosure of Deferred Income Tax Assets (Liabilities) [Line Items] |  |
Deferred income tax assets-gross | 10,155 | 9,348
Deferred tax assets and liabilities [abstract] |  |
Deferred income tax liabilities-gross | (1,345) | (1,266)
Non-capital tax loss carry forwards |  |
Disclosure of Deferred Income Tax Assets (Liabilities) [Line Items] |  |
Deferred income tax assets-gross | 13,806 | 18,489
Investments equity instruments and uranium |  |
Deferred tax assets and liabilities [abstract] |  |
Deferred income tax liabilities-gross | (17,738) | (25,088)
Capital loss carry forward |  |
Disclosure of Deferred Income Tax Assets (Liabilities) [Line Items] |  |
Deferred income tax assets-gross | 17,738 | 25,088
Inventory |  |
Deferred tax assets and liabilities [abstract] |  |
Deferred income tax liabilities-gross | (850) | (852)
Reclamation obligations |  |
Disclosure of Deferred Income Tax Assets (Liabilities) [Line Items] |  |
Deferred income tax assets-gross | 11,080 | 11,699
Post-employment benefits |  |
Disclosure of Deferred Income Tax Assets (Liabilities) [Line Items] |  |
Deferred income tax assets-gross | 268 | 295
Property, plant and equipment, net |  |
Disclosure of Deferred Income Tax Assets (Liabilities) [Line Items] |  |
Deferred income tax assets-gross | 387 | 387
Deferred tax assets and liabilities [abstract] |  |
Deferred income tax liabilities-gross | $ (35,872) | $ (40,707)

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