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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Classes of current inventories [abstract]    
Concentrates $ 1,230 $ 1,391
Ore stockpile 1,436 2,877
Spare parts and supplies 5,584 5,098
Inventories $ 8,250 $ 9,366