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Investments in associates (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 CAD ($) share | Dec. 31, 2022 CAD ($)
Disclosure of associates [line items] |  |
Impairment of an investment in an associate | $ 64,771 | $ 2,361
Osisko Development Corp [Member] |  |
Disclosure of associates [line items] |  |
Impairment of an investment in an associate | $ 64,500 |
Information whether recoverable amount of asset is fair value less costs of disposal or value in use | The Company estimated the recoverable amount of its investment at $115.7 million, using a fair value less costs of disposal model with reference to Osisko Development's share price quoted on active markets, which is considered a Level 1 input. |
Shares held in associates | share | 33,333,366 |
Proportion of ownership interest in associate | 39.60% | 44.10%
Osisko Development Corp [Member] | Cariboo Gold [Member] |  |
Disclosure of associates [line items] |  |
NSR royalty percentage | 5.00% |
Osisko Development Corp [Member] | San Antonio gold project [Member] |  |
Disclosure of associates [line items] |  |
NSR royalty percentage | 15.00% |
Osisko Development Corp [Member] | Tintic property [Member] |  |
Disclosure of associates [line items] |  |
NSR royalty percentage | 2.50% |

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