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Acquisition of the San Antonio gold project - Disclosure of detailed information about acquisition of San Antonio gold project (Details) - San Antonio gold project [Member]
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
shares
Dec. 31, 2020
USD ($)
shares
Consideration paid    
Issuance of common shares $ 15,846 $ 12.0
Number of shares issued 1,011,374 1,011,374
Cash consideration $ 40,015 $ 30.0
Value-added tax paid on acquisition of assets 6,328  
Osisko's transaction costs 5,865  
Net consideration paid 68,054 $ 42.0
Net assets acquired    
Inventories 7,899  
Inventories - non-current 16,129  
Other non-current assets 6,328  
Mining interests and plant and equipment 58,368  
Accounts payable and accrued liabilities (11,369)  
Provision and other liabilities (9,301)  
Net assets acquired $ 68,054