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Production costs - Summary of Product Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Expenses by nature [abstract]    
Labour $ 123,798 $ 99,680
Fuel 20,719 17,306
Reagents 47,134 48,669
Electricity 22,237 23,201
Mining contractors 58,700 45,364
Operating and maintenance supplies and services 135,733 129,565
Support costs 56,348 40,949
Royalties 79,402 51,813
Selling expenses 20,087 22,400
Production costs $ 564,158 $ 478,947