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Investments in associates - Disclosure of associates (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of associates [line items]    
Current assets $ 152,926 $ 335,188
Current liabilities 346,276 109,545
Revenues 224,877 213,630
Other comprehensive (loss) income 2,177 28,625
Comprehensive loss (54,498) 44,854
Osisko Mining [Member]    
Disclosure of associates [line items]    
Current assets 185,307 326,563
Non-current assets 664,544 486,492
Current liabilities 31,440 43,482
Non-current liabilities 109,502 79,316
Revenues 0 0
Net loss from continuing operations and net loss (8,149) (33,337)
Other comprehensive (loss) income (10,730) 11,609
Comprehensive loss (18,879) (21,728)
Carrying value of investment 98,885 95,379
Fair value of investment 190,590 185,087
Osisko Metals [Member]    
Disclosure of associates [line items]    
Current assets 5,659 1,616
Non-current assets 89,006 91,828
Current liabilities 2,676 3,028
Non-current liabilities 1,607 2,935
Revenues 0 0
Net loss from continuing operations and net loss (4,618) (9,646)
Other comprehensive (loss) income (36) (9,818)
Comprehensive loss (4,654) (19,464)
Carrying value of investment 13,470 14,204
Fair value of investment $ 12,140 $ 13,696