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Exploration and evaluation - Disclosure of detailed information about exploration assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statements Line Items    
Beginning balance $ 95,002 $ 102,182
Additions 221 257
Investments tax credits 0 (93)
Transfer to royalty, stream and other interests (2,288) 0
Impairment (49,986) (7,344)
Ending balance 42,949 95,002
Cost [Member]    
Statements Line Items    
Beginning balance 103,206  
Ending balance 101,139 103,206
Accumulated impairment [Member]    
Statements Line Items    
Beginning balance (8,204)  
Ending balance $ (58,190) $ (8,204)