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Production costs - Summary of Product Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Expenses by nature [abstract]    
Labour $ 99,680 $ 90,460
Fuel 17,306 24,430
Reagents 48,669 45,442
Electricity 23,201 31,729
Mining contractors 45,364 39,708
Operating and maintenance supplies and services 129,565 104,272
Support costs 40,949 53,669
Royalties and selling expenses 74,213 69,876
Production costs $ 478,947 $ 459,586