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Derivative instruments - Provisionally priced sales (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
GAIN ON THE PROVISIONAL PRICING OF CONCENTRATE SALES    
Realized $ 13.0 $ 2.1
Unrealized (0.5) 0.6
Total gain 12.5 2.7
Gold    
GAIN ON THE PROVISIONAL PRICING OF CONCENTRATE SALES    
Realized 8.3 1.5
Unrealized 0.0 0.4
Total gain 8.3 1.9
Copper    
GAIN ON THE PROVISIONAL PRICING OF CONCENTRATE SALES    
Realized 4.7 0.6
Unrealized (0.5) 0.2
Total gain $ 4.2 $ 0.8