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Income taxes (Significant components of deferred tax assets and liabilities) (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | $ (51,296,000) | $ (92,791,000) |
Deferred tax assets | 843,131,000 | 892,860,000 |
Deferred tax liabilities | 0 | 0 |
Net deferred tax asset (liability) | 843,131,000 | 892,860,000 | $ 984,071,000
Property, plant and equipment [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | (41,454,000) | 67,736,000 |
Net deferred tax assets | 475,008,000 | 515,872,000 |
Provision for reclamation [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | (11,237,000) | (4,157,000) |
Net deferred tax assets | 188,422,000 | 199,659,000 |
Inventories [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | (4,979,000) | 3,292,000 |
Net deferred tax assets | 6,561,000 | 11,540,000 |
Net deferred tax liabilities | 0 | 0 |
Foreign exploration and development [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | (398,000) | (51,000) |
Net deferred tax assets | 2,191,000 | 2,589,000 |
Income tax losses (gains) [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | (8,108,000) | (141,907,000) |
Net deferred tax assets | 85,668,000 | 93,776,000 |
Defined benefit plan actuarial losses [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | 0 | 0 |
Net deferred tax assets | 5,233,000 | 4,279,000 |
Long-term investments and other, deferred tax assets [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | 14,880,000 | (17,704,000) |
Net deferred tax assets | 80,048,000 | 65,145,000 |
Deferred tax assets [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | (51,296,000) | (92,791,000) |
Net deferred tax assets | 843,131,000 | 892,860,000 |
Property, plant and equipment [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | 0 | 0 |
Net deferred tax liabilities | 0 | 0 |
Inventories [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | 0 | 0 |
Net deferred tax liabilities | 0 | 0 |
Deferred tax liabilities [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | 0 | 0 |
Net deferred tax liabilities | $ 0 | $ 0 |

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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_o&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_56&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2024-03-27 + Details
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