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Deconsolidation of Osisko Development and discontinued operations (Narrative) (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2022
CAD ($)
Rate
May 31, 2022
CAD ($)
Apr. 30, 2022
CAD ($)
shares
Apr. 30, 2022
USD ($)
$ / shares
shares
Mar. 31, 2022
CAD ($)
$ / shares
Rate
shares
Mar. 31, 2022
USD ($)
$ / shares
Rate
shares
Sep. 30, 2022
CAD ($)
Rate
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Rate
May 31, 2022
USD ($)
Disclosure of analysis of single amount of discontinued operations [line items]                    
Investments in associates               $ 115,651 $ 319,763  
Recognized royalty and stream interests on assets held                 122,053  
Net loss from discontinued operations               0 (268,475)  
Impairment charge               47,619 $ 1,818  
Osisko Development Corp [Member]                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Proportion of ownership interest in subsidiary | Rate 44.10%               75.10%  
Investments in associates $ 207,000           $ 207,000      
Recognized royalty and stream interests on assets held 122,100                  
Net non-cash loss on deconsolidation 140,900                  
Share consolidation ratio of ODV shares   a three for one basis (3:1)                
ODV bought deal private placement [Member]                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Description of units issued of ODV         Each ODV Unit was comprised of one common share of the company (each, an "ODV Common Share") and one common share purchase warrant (each, an "ODV Warrant"), with each ODV Warrant entitling the holder thereof to purchase one additional ODV Common Share at a price of $7.60 per ODV Common Share for a period of 60 months following the date hereof. Each ODV Unit was comprised of one common share of the company (each, an "ODV Common Share") and one common share purchase warrant (each, an "ODV Warrant"), with each ODV Warrant entitling the holder thereof to purchase one additional ODV Common Share at a price of $7.60 per ODV Common Share for a period of 60 months following the date hereof.        
Exercise price for warrants issued of ODV | $ / shares         $ 7.6          
Proceeds from private placements received by ODV         $ 103,500          
Number of ODV Subscription Receipts | shares         13,732,900 13,732,900        
Price per Offered Security (ODV Subscription Receipts and ODV Units) | $ / shares         $ 4.45          
Number of ODV Units | shares         9,525,850 9,525,850        
Percentage of cash commission paid to the underwriters | Rate         5.00% 5.00%        
First tranche of ODV non-brokered private placement [Member]                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Proceeds from private placements received by ODV         $ 108,100 $ 84.8        
Number of ODV Subscription Receipts | shares         24,215,099 24,215,099        
Price per Offered Security (ODV Subscription Receipts and ODV Units) | $ / shares           $ 3.5        
Second tranche of ODV non-brokered private placement [Member]                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Proceeds from private placements received by ODV         $ 41,000 $ 32.8        
Number of ODV Subscription Receipts | shares         9,365,689 9,365,689        
Price per Offered Security (ODV Subscription Receipts and ODV Units) | $ / shares           $ 3.5        
Third tranche of the ODV non-brokered private placement [Member]                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Proceeds from private placements received by ODV     $ 2,200 $ 1.8            
Number of ODV Subscription Receipts | shares     512,980 512,980            
Price per Offered Security (ODV Subscription Receipts and ODV Units) | $ / shares       $ 3.5            
Osisko Development, discontinued operations [Member]                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Revenues of discontinued operations                 $ 44,820  
Net loss from discontinued operations                 $ (268,475)  
Tintic Consolidated Metals LLC [Member] | Osisko Development Corp [Member]                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Deferred consideration   $ 15,900               $ 12.5
Consideration paid   199,473                
Convertible instruments   $ 10,827               $ 8.5
Tintic Consolidated Metals LLC [Member] | Osisko Development, discontinued operations [Member]                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Revenues of discontinued operations               11,500    
Net loss from discontinued operations               $ 1,600    
San Antonio gold project [Member]                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Impairment charge             81,000      
Estimated recoverable amount $ 35,000           $ 35,000      
Pre-tax real discount rate | Rate 19.90%           19.90%      
Additional impairment charge if the pre-tax real discount rate had been 100 basis points higher             $ 5,800