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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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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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