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Income taxes (Significant components of deferred tax assets and liabilities) (Details) - CAD ($) | 12 Months Ended |
--- | --- | ---
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 asset, recognized in earnings | $ (92,791,000) | $ 12,142,000 |
Deferred tax assets | 892,860,000 | 984,071,000 |
Deferred tax liabilities | 0 | 0 |
Net deferred tax asset (liability) | 892,860,000 | 984,071,000 | $ 937,579,000
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 | 67,736,000 | 84,668,000 |
Net deferred tax assets | 515,872,000 | 448,136,000 |
Provision for reclamation [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | (4,157,000) | (3,817,000) |
Net deferred tax assets | 199,659,000 | 203,816,000 |
Inventories [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | 3,292,000 | 1,689,000 |
Net deferred tax assets | 11,540,000 | 8,248,000 |
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 | (51,000) | (1,816,000) |
Net deferred tax assets | 2,589,000 | 2,641,000 |
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 | (141,907,000) | (66,227,000) |
Net deferred tax assets | 93,776,000 | 235,683,000 |
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 | 4,279,000 | 2,698,000 |
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 | (17,704,000) | (2,355,000) |
Net deferred tax assets | 65,145,000 | 82,849,000 |
Deferred tax assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset, recognized in earnings | (92,791,000) | 12,142,000 |
Net deferred tax assets | 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 | 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 2023-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_o&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_56&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2023-03-23 + Details
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