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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Inventories [abstract]
Concentrate stockpiles	$ 2,594	$ 1,285
Ore stockpiles	4,144	2,659
Materials and supplies	11,015	9,628
Total current inventories	17,753	13,572
Cost of inventories recognised as expense during period	156,614	127,984
Inventory write-down	$ 985	$ 280

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Concentrate stockpiles.

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Inventories [abstract].

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The amount of inventories recognised as an expense during the period. [Refer: Inventories]

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A classification of current inventory representing the amount of ore stockpiles. [Refer: Inventories]

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