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Production Costs - Summary of Product Cost (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Expenses by nature [abstract] |  |
Labour | $ 52,670 | $ 55,223
Fuel | 23,241 | 22,405
Reagents | 40,839 | 35,292
Electricity | 12,132 | 13,991
Mining contractors | 12,575 | 16,028
Operating and maintenance supplies and services | 56,342 | 45,376
Site general and administrative costs | 23,621 | 20,394
Inventory change | (36,501) | (19,510)
Royalties, production taxes and selling expenses | 7,821 | 5,470
Production costs | $ 192,740 | $ 194,669

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