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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Classes of current inventories [abstract]    
Concentrates $ 1,391 $ 1,266
Ore stockpile 2,877 161
Spare parts and supplies 5,098 5,191
Inventories $ 9,366 $ 6,618