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Income taxes (Significant components of unrecognized deferred tax assets) (Details) - CAD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | $ 554,905 | $ 437,010
Income tax losses (gains) [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | 357,148 | 337,749
Property, plant and equipment, deferred tax assets [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | 2,299 | 2,297
Provision for reclamation [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | 68,038 | 78,336
Long-term investments and other, deferred tax assets [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deferred tax assets | $ 127,420 | $ 18,628

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