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Supplemental cash flow information (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in non-cash working capital    
Accounts receivable $ 58,488 $ (44,353)
Inventories 113,388 241,496
Supplies and prepaid expenses 3,612 52,192
Accounts payable and accrued liabilities (62,250) (39,616)
Reclamation payments (32,390) (31,311)
Other 15,630 4,654
Total $ 96,478 $ 183,062