v3.26.1
Environmental rehabilitation provision (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2025
CAD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2025
USD ($)
Reconciliation of changes in other provisions [abstract]      
Current portion $ 6,970 $ 5,974  
Non-current portion 92,209 84,829  
Estimated inflation-adjusted undiscounted cash flows required to settle the environmental rehabilitation 166,000    
Environmental bonding insurance 1 8,300   $ 6.1
Environmental bonding insurance 2 70,500    
Environmental rehabilitation provision      
Reconciliation of changes in other provisions [abstract]      
Balance - Beginning of period 90,803 76,729  
New obligations and revision of estimates 23,169 13,495  
Accretion expense 3,547 3,432  
Payment of environmental rehabilitation obligations (667) (2,190)  
Transfer to liabilities associated with asset held for sale (18,818)    
Currency translation adjustment 1,145 (663)  
Balance - End of period 99,179 90,803  
Current portion 6,970 5,974  
Non-current portion 92,209 84,829  
Total liabilities 99,179 90,803  
Estimated inflation-adjusted undiscounted cash flows required to settle the environmental rehabilitation $ 285,500 $ 126,300  
Weighted average actualization rate 3.36% 4.40%  
Average discount rate (as percent) 3.36% 4.40%  
Additional Environmental Rehabilitation Obligation Related To An Inactive Site      
Reconciliation of changes in other provisions [abstract]      
Weighted average actualization rate 3.70%    
Direct closure costs $ 600    
Long-term care and maintenance costs $ 165,500    
Term period 100 years    
Discount value $ 21,400    
Average discount rate (as percent) 3.70%