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Copper Mountain non-controlling interest acquisition (Narrative) (Details) - Copper Mountain Mine (BC) Ltd. [Member] - Mitsubishi Materials Corporation [Member] - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about business combination [line items]    
Percentage of voting equity interests acquired 25.00%  
Cash consideration $ 4,500  
Annual deferred payments 21,000  
Annual deferred payments, amount per payment 3,000  
Contingent payments 18,750  
Additional contingent payments $ 3,750  
Proportion of ownership interest in subsidiary 100.00% 75.00%
Total consideration transferred $ 35,900  
Annual deferred payments recorded as financial liability 16,600  
Contingent payments recorded as financial liability 13,300  
Transaction cost recorded in equity $ 1,500