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Income and mining taxes - Composition of income tax expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
INCOME AND MINING TAXES [Abstract]    
Current income and mining tax expense $ 2.5 $ 2.1
Deferred income and mining tax (recovery) expense 21.9 (3.2)
Total income tax expense $ (19.4) $ 5.3