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Exploration and evaluation - Disclosure of detailed information about exploration assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Statements Line Items    
Beginning balance $ 42,519 $ 42,949
Additions 3,784 201
Impairment (42,668) 0
Transfer to royalty, stream and other interests 0 (631)
Ending balance 3,635 42,519
Cost [Member]    
Statements Line Items    
Beginning balance 100,708  
Ending balance 104,492 100,708
Accumulated impairment [Member]    
Statements Line Items    
Beginning balance (58,189)  
Ending balance $ (100,857) $ (58,189)