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Production costs - Summary of Product Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Expenses by nature [abstract] |  |
Labour | $ 116,653 | $ 100,908
Fuel | 16,464 | 12,931
Reagents | 53,399 | 29,871
Electricity | 17,904 | 16,330
Mining contractors | 38,240 | 30,162
Operating and maintenance supplies and services | 78,062 | 63,097
Site general and administrative costs | 46,588 | 42,919
Royalties, production taxes and selling expenses | 77,873 | 38,621
Production costs | $ 445,183 | $ 334,839

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