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Mining interests and plant and equipment (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2021
CAD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
CAD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items]            
Impairment loss         $ 124,538 $ 26,300
Plant and equipment [Member]            
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items]            
Right-of-use assets         $ 20,300 $ 10,800
Bonanza Ledge Phase 2 Project [Member]            
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items]            
Impairment loss $ 22,400   $ 36,100      
Estimated recoverable amount     $ 12,400      
Average gold price per ounce   $ 1,787   $ 1,797    
Short-term remaining mine life 18 months 18 months 18 months 18 months    
Additional Impairment Charge if gold price per ounce applied to cash flow projections had been 10% lower     $ 9,300      
Additional impairment charge if the average gold grade or gold recovery applied to the cash flows had been 10% lower     $ 12,400