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Income taxes (Narrative) (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Major Components Of Tax Expense (Income) [Line Items]        
Current income taxes $ 1,231   $ 7,153  
Statutory tax rate 26.50% 26.50% 26.50% 26.50%
Unrecognized deferred tax liabilities $ 114,600   $ 110,800  
Unrecognized deferred tax assets $ 79,515   $ 57,336  
San Antonio gold project [Member]        
Major Components Of Tax Expense (Income) [Line Items]        
Current income taxes   $ 4.5   $ 5.8