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Supplemental cash flow information (Statements of detailed information of cash flow) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Changes in non-cash working capital    
Accounts receivable $ 99,601 $ (75,678)
Inventories (162,858) 300,307
Supplies and prepaid expenses (63,500) (5,908)
Accounts payable and accrued liabilities 16,401 91,757
Reclamation payments (28,492) (19,542)
Other 19,417 (3,683)
Total $ (119,431) $ 287,253