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Production costs (Tables) | 12 Months Ended
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Dec. 31, 2018
Expenses by nature [abstract] |
Summary of Product Cost |
| 2018 |  |  | 2017 |
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 |
| $ | 267,980 |  |  | $ | 192,740 |

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