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Mining interests and plant and equipment (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2022
CAD ($)
Sep. 30, 2021
CAD ($)
$ / Ounce
Jun. 30, 2021
CAD ($)
$ / Ounce
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items]          
Impairment loss       $ 1,818 $ 2,948
Plant and equipment [Member]          
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items]          
Right-of-use assets       $ 6,800 $ 20,300
San Antonio gold project [Member]          
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items]          
Impairment loss $ 81,000        
Estimated recoverable amount $ 35,000        
Pre-tax real discount rate 19.90%        
Additional impairment charge if gold price per ounce applied to cash flow projections had been 10% lower $ 35,000        
Additional impairment charge if the pre-tax real discount rate had been 100 basis points higher $ 5,800        
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 | $ / Ounce   1,787 1,797    
Short-term remaining mine life   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 had been 10% lower     $ 12,400