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Production costs - Summary of Product Cost (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Expenses by nature [abstract] |  |
Labour | $ 74,023 | $ 52,670
Fuel | 14,910 | 23,241
Reagents | 40,587 | 40,839
Electricity | 14,288 | 12,132
Mining contractors | 17,107 | 12,575
Operating and maintenance supplies and services | 31,772 | 56,342
Site general and administrative costs | 33,667 | 23,621
Inventory change | 33,459 | (36,501)
Royalties, production taxes and selling expenses | 8,167 | 7,821
Production costs | $ 267,980 | $ 192,740

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