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Production costs - Summary of Product Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Expenses by nature [abstract]    
Labour $ 90,460 $ 104,016
Fuel 24,430 17,889
Reagents 45,442 42,473
Electricity 31,729 21,471
Mining contractors 39,708 40,056
Operating and maintenance supplies and services 104,272 104,519
Site general and administrative costs 53,669 56,476
Royalties and selling expenses 69,876 62,848
Production costs $ 459,586 $ 449,748