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Fair value of financial instruments - Disclosure of detailed information about changes in fair value of level 3 investments (Details) - Level 3 [Member] - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets [line items]    
Balance - January 1 $ 26,903 $ 34,934
Acquisitions 0 7,968
Warrants exercised 0 (80)
Acquisition of Tintic by Osisko Development 0 (10,827)
Transfer of common shares from level 3 to level 1 (3,000) 0
Disposal (5,000) 0
Foreign exchange revaluation impact 0 49
Deconsolidation of Osisko Development 0 (110)
Balance - December 31 9,105 26,903
Warrants exercised [Member]    
Disclosure of fair value measurement of assets [line items]    
Change in fair value 0 322
Warrants expired [Member]    
Disclosure of fair value measurement of assets [line items]    
Change in fair value (552) (405)
Investments held at the end of the period [Member]    
Disclosure of fair value measurement of assets [line items]    
Change in fair value $ (9,246) $ (4,304)