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Production costs - Summary of Product Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Expenses by nature [abstract] |  |
Labour | $ 100,908 | $ 70,336
Fuel | 12,931 | 16,454
Reagents | 29,871 | 49,222
Electricity | 16,330 | 13,864
Mining contractors | 30,162 | 14,782
Operating and maintenance supplies and services | 89,828 | 62,544
Site general and administrative costs | 42,919 | 33,614
Royalties, production taxes and selling expenses | 11,890 | 8,629
Production costs | $ 334,839 | $ 269,445

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