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Investments in associates (Narrative) (Details) - share
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Osisko Development Corp [Member]    
Disclosure of associates [line items]    
Shares held in associates 33,333,366  
Proportion of ownership interest in associate 44.10% 75.10%
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] | Trixie property [Member]    
Disclosure of associates [line items]    
NSR royalty percentage 2.50%  
Osisko Mining [Member]    
Disclosure of associates [line items]    
Shares held in associates 50,023,569  
Proportion of ownership interest in associate 14.40% 14.40%
Osisko Mining [Member] | Windfall gold project [Member] | Minimum [Member]    
Disclosure of associates [line items]    
NSR royalty percentage 2.00%  
Osisko Mining [Member] | Windfall gold project [Member] | Maximum [Member]    
Disclosure of associates [line items]    
NSR royalty percentage 3.00%  
Osisko Metals [Member] | Other properties held by Osisko Mining [Member]    
Disclosure of associates [line items]    
NSR royalty percentage 1.00%