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Environmental rehabilitation provision (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in other provisions [abstract]    
Current liabilities $ 4,204 $ 9,738
Non-current liabilities 72,525 66,032
Environmental rehabilitation provision    
Reconciliation of changes in other provisions [abstract]    
Balance - Beginning of year 75,770 53,236
Acquisition of Tintic   4,599
New liabilities 3,660 22,353
Revision of estimates (3,964) (5,637)
Accretion expense 3,154 3,223
Settlement of liabilities / payment of liabilities (2,933) (3,409)
Currency translation adjustment 1,042 1,405
Balance - End of year 76,729 75,770
Current liabilities 4,204 9,738
Non-current liabilities 72,525 66,032
Total liabilities 76,729 $ 75,770
Estimated inflation-adjusted undiscounted cash flows required to settle the environmental rehabilitation $ 88,600  
Weighted average actualization rate 4.47%