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v3.20.1

Investments in associates (Narrative) (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) share $ / shares | Dec. 31, 2018 CAD ($)
Disclosure of associates [line items] |  |  |
Investments in associates |  | $ 103,640 | $ 304,911
Impairment of investments in associates |  | $ 12,500 | $ 0
Osisko Mining [Member] |  |  |
Disclosure of associates [line items] |  |  |
Proportion of ownership interest in associate |  | 15.90% | 16.70%
Investments in associates |  | $ 7,700 | $ 18,000
Shares held in associates | share |  | 45,969,569 |
Osisko Mining [Member] | Windfall Lake project [Member] | Top of range [member] |  |  |
Disclosure of associates [line items] |  |  |
NSR Royalty Percentage |  | 2.00% |
Osisko Mining [Member] | Windfall Lake project [Member] | Bottom of range [member] |  |  |
Disclosure of associates [line items] |  |  |
NSR Royalty Percentage |  | 3.00% |
Osisko Metals Incorporated [Member] |  |  |
Disclosure of associates [line items] |  |  |
Proportion of ownership interest in associate |  | 17.90% | 12.70%
Investments in associates |  | $ 7,800 | $ 3,000
Shares held in associates | share |  | 29,877,397 |
Osisko Metals Incorporated [Member] | Pine Point Mining Camp [Member] | Events After Reporting Period [Member] |  |  |
Disclosure of associates [line items] |  |  |
NSR Royalty Percentage | 1.50% |  |
Purchase price, acquisition of royalty | $ 6,500 |  |
Osisko Metals Incorporated [Member] | Bathurst Mining Camp [Member] |  |  |
Disclosure of associates [line items] |  |  |
NSR Royalty Percentage |  | 1.00% |
Falco [Member] |  |  |
Disclosure of associates [line items] |  |  |
Impairment of investments in associates |  | $ 12,500 |
Impairment of investments in associates, net of income taxes |  | $ 10,800 |
Dalradian Resources Inc. [Member] |  |  |
Disclosure of associates [line items] |  |  |
Cash consideration per common share | $ / shares |  | $ 1.47 |

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