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Provisions and other liabilities - Disclosure of other provisions (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of other provisions [line items]    
Balance - Beginning of period $ 72,513 $ 45,967
Acquisition of Tintic by Osisko Development 20,804 0
New liabilities 40,210 34,011
Revision of estimates (6,762) (1,457)
Change in fair value (21,483) 0
Accretion 2,518 1,192
Settlements/payments of liabilities (9,729) (7,822)
Issuance of flow-through shares 0 7,885
Recognition of deferred premium on flow-through shares (914) (6,971)
Currency translation adjustments 3,687 (292)
Deconsolidation of Osisko Development (93,222) 0
Balance - End of period 7,622 72,513
Current portion 921 12,179
Non-current portion 6,701 60,334
Balance - End of period 7,622 72,513
Environmental rehabilitation [Member]    
Disclosure of other provisions [line items]    
Balance - Beginning of period 53,237  
Acquisition of Tintic by Osisko Development 5,370  
New liabilities 261  
Revision of estimates (4,299)  
Change in fair value 0  
Accretion 2,185  
Settlements/payments of liabilities (2,549)  
Issuance of flow-through shares 0  
Recognition of deferred premium on flow-through shares 0  
Currency translation adjustments 1,193  
Deconsolidation of Osisko Development (55,398)  
Balance - End of period 0 53,237
Current portion 0  
Non-current portion 0  
Balance - End of period 0 53,237
Lease liabilities [Member]    
Disclosure of other provisions [line items]    
Balance - Beginning of period 18,362  
Acquisition of Tintic by Osisko Development 325  
New liabilities 108  
Revision of estimates (2,463)  
Change in fair value 0  
Accretion 0  
Settlements/payments of liabilities (7,180)  
Issuance of flow-through shares 0  
Recognition of deferred premium on flow-through shares 0  
Currency translation adjustments 12  
Deconsolidation of Osisko Development (1,542)  
Balance - End of period 7,622 18,362
Current portion 921  
Non-current portion 6,701  
Balance - End of period 7,622 18,362
Deferred premium on flow-through shares [Member]    
Disclosure of other provisions [line items]    
Balance - Beginning of period 914  
Acquisition of Tintic by Osisko Development 0  
New liabilities 0  
Revision of estimates 0  
Change in fair value 0  
Accretion 0  
Settlements/payments of liabilities 0  
Issuance of flow-through shares 0  
Recognition of deferred premium on flow-through shares (914)  
Currency translation adjustments 0  
Deconsolidation of Osisko Development 0  
Balance - End of period 0 914
Current portion 0  
Non-current portion 0  
Balance - End of period 0 914
Derivative financial instruments [Member]    
Disclosure of other provisions [line items]    
Balance - Beginning of period 0  
Acquisition of Tintic by Osisko Development 0  
New liabilities 39,841  
Revision of estimates 0  
Change in fair value (21,483)  
Accretion 0  
Settlements/payments of liabilities 0  
Issuance of flow-through shares 0  
Recognition of deferred premium on flow-through shares 0  
Currency translation adjustments 1,333  
Deconsolidation of Osisko Development (19,691)  
Balance - End of period 0 0
Current portion 0  
Non-current portion 0  
Balance - End of period 0 0
Deferred consideration and contingent payments [Member]    
Disclosure of other provisions [line items]    
Balance - Beginning of period 0  
Acquisition of Tintic by Osisko Development 15,109  
New liabilities 0  
Revision of estimates 0  
Change in fair value 0  
Accretion 333  
Settlements/payments of liabilities 0  
Issuance of flow-through shares 0  
Recognition of deferred premium on flow-through shares 0  
Currency translation adjustments 1,149  
Deconsolidation of Osisko Development (16,591)  
Balance - End of period 0 0
Current portion 0  
Non-current portion 0  
Balance - End of period $ 0 $ 0