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Inventories, net (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Inventories, net |  |
Stockpiles - underground mine | $ 1,165 | $ 1,450
Stockpiles - open pit mine | 132 | 101
Concentrates and dore | 2,123 | 2,367
Materials and supplies | 9,122 | 7,718
Inventories - current | 12,542 | 11,636
Inventory reserve | $ 734 | $ 743

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