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Subsequent events (Narrative) (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Millions
 1 Months Ended 2 Months Ended 12 Months Ended
Feb. 09, 2022
CAD ($)
$ / shares
Rate
shares
Feb. 07, 2022
USD ($)
$ / shares
shares
Feb. 24, 2022
$ / shares
Feb. 18, 2022
shares
Jan. 25, 2022
USD ($)
share
$ / shares
Rate
Jan. 25, 2022
USD ($)
a
Ounce
share
Rate
Feb. 24, 2022
CAD ($)
$ / shares
shares
Dec. 31, 2021
CAD ($)
$ / shares
shares
Dec. 31, 2020
CAD ($)
$ / shares
shares
Disclosure of non-adjusting events after reporting period [line items]                  
Normal course issuer bid purchase of common shares (shares) | shares               2,103,366 429,722
Normal course issuer bid purchase of common shares               $ 30,791 $ 3,933
Average acquisition price per share | $ / shares               $ 14.64 $ 9.15
Osisko Development Corp [Member] | Bought deal private placement [Member]                  
Disclosure of non-adjusting events after reporting period [line items]                  
Number of share subscriptions issued in a private placement | shares                 13,350,000
Subscription price per share | $ / shares                 $ 7.50
Total gross proceeds from private placement                 $ 100,100
Exercise price of warrants granted | $ / shares                 $ 10.00
Subsequent events [Member]                  
Disclosure of non-adjusting events after reporting period [line items]                  
Dividends payable amount per share | $ / shares     $ 0.055            
Date on which dividends are payable     April 14, 2022            
Subsequent events [Member] | Warrants [Member]                  
Disclosure of non-adjusting events after reporting period [line items]                  
Number of warrants expired during period | shares       5,480,000          
Subsequent events [Member] | 2022 NCIB program [Member]                  
Disclosure of non-adjusting events after reporting period [line items]                  
Normal course issuer bid purchase of common shares (shares) | shares             347,492    
Normal course issuer bid purchase of common shares             $ 4,900    
Average acquisition price per share | $ / shares             $ 14.04    
Subsequent events [Member] | Osisko Development Corp [Member] | Acquisition of Tintic [Member] | IG Tintic LLC and Ruby Hollow LLC [Member]                  
Disclosure of non-adjusting events after reporting period [line items]                  
Percentage of voting equity interests acquired | Rate         100.00% 100.00%      
Percentage of production rights acquired | Rate           100.00%      
Non-patented area of mineral covered by claims | a           17,000      
Patented area of mineral covered by claims | a           14,200      
Consideration transferred, acquisition-date fair value         $ 177.0 $ 177.0      
Cash transferred         54.0 54.0      
Equity interests of acquirer         $ 123.0 $ 123.0      
Number of instruments or interests issued or issuable | share         35,099,611 35,099,611      
Price per share under acquisition | $ / shares         $ 4.32        
Value of annual equal instalments deferred payments payable         $ 12.5 $ 12.5      
Period of annual equal instalments deferred payments payable           5 years      
Number of NSR           two      
NSR royalty percentage | Rate           1.00%      
Percentage of each buyback right | Rate           50.00%      
Value of each buyback right           $ 7.5      
Exercise period of each buyback right           5 years      
Percentage of Net Smelter Returns considered for financial equivalent | Rate           10.00%      
Value of loan owed for set off         5.0 $ 5.0      
Value of contingent liability upon commencement of production         10.0 10.0      
Subsequent events [Member] | Osisko Development Corp [Member] | Non-brokered private placement [Member]                  
Disclosure of non-adjusting events after reporting period [line items]                  
Number of share subscriptions issued in a private placement | shares   31,500,000              
Subscription price per share | $ / shares   $ 3.50              
Total gross proceeds from private placement   $ 110.3              
Subsequent events [Member] | Osisko Development Corp [Member] | Non-brokered private placement [Member] | Warrants [Member]                  
Disclosure of non-adjusting events after reporting period [line items]                  
Exercise price of warrants granted | $ / shares   $ 6.00              
Exercise period of warrant   5 years              
Subsequent events [Member] | Osisko Development Corp [Member] | Bought deal private placement [Member]                  
Disclosure of non-adjusting events after reporting period [line items]                  
Number of share subscriptions issued in a private placement | shares 20,225,000                
Subscription price per share | $ / shares $ 4.45                
Total gross proceeds from private placement $ 90,000                
Exercise price of warrants granted | $ / shares $ 7.60                
Number of additional common shares issued during period | shares 3,033,750                
Value of additional common shares issued during period $ 13,500                
Percentage of commissions payable | Rate 50.00%                
Subsequent events [Member] | Osisko Bermuda [Member] | Acquisition of metal stream with a wholly-owned subsidiary of Osisko Development                  
Disclosure of non-adjusting events after reporting period [line items]                  
Value of upfront cash payment           20.0      
Cash consideration payable on closing of transaction         $ 40.0 $ 40.0      
Metal production percentage delivery of all metals | Rate           5.00%      
Delivery of gold, ounces | Ounce           53,400      
Metals production percentage after the delivery of 53,400 ounces of gold | Rate           4.00%