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Investments in associates - Disclosure of associates (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of associates [line items]    
Current assets $ 104,794 $ 152,926
Current liabilities 17,867 346,276
Revenue 217,809 224,877
Net earnings from continuing operations 85,285 76,627
Other comprehensive (loss) income 9,080 2,177
Comprehensive loss (174,110) (54,498)
Osisko Development Corp. [Member]    
Disclosure of associates [line items]    
Current assets 168,104 61,425
Non-current assets 839,811 641,699
Current liabilities 53,275 41,854
Non-current liabilities 160,802 77,068
Revenue 47,801 4,681
Net earnings from continuing operations (184,016) (84,620)
Other comprehensive (loss) income 14,927 (12,846)
Comprehensive loss (169,089) (97,466)
Carrying value of investment 207,000  
Fair value of investment 192,334  
Osisko Mining [Member]    
Disclosure of associates [line items]    
Current assets 175,012 185,307
Non-current assets 796,242 664,544
Current liabilities 28,244 31,440
Non-current liabilities 230,200 109,502
Revenue 0 0
Net earnings from continuing operations (2,947) (8,149)
Other comprehensive (loss) income (4,570) (9,816)
Comprehensive loss (7,517) (17,965)
Carrying value of investment 99,714 98,885
Fair value of investment $ 175,082 190,590
Osisko Metals [Member]    
Disclosure of associates [line items]    
Current assets   5,659
Non-current assets   89,006
Current liabilities   2,676
Non-current liabilities   1,607
Revenue   0
Net earnings from continuing operations   (4,618)
Other comprehensive (loss) income   (36)
Comprehensive loss   (4,654)
Carrying value of investment   13,470
Fair value of investment   $ 12,140