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OPERATING COSTS BY NATURE - Cost of Sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Analysis of income and expense [abstract]
Cost of inventory	$ 245,111	$ 242,998
Depletion, depreciation and amortization	98,719	102,416
Moratorium (settlement) (note 13)	0	(4,303)
(Recovery) of inventory provision (note 7)	0	(5,710)
Restructuring costs	0	109
Cost of sales	$ 343,830	$ 335,510

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

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The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories.

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The amount of expense relating to restructuring. Restructuring is a programme that is planned and controlled by management and materially changes either the scope of a business undertaken by an entity or the manner in which that business is conducted. Such programmes include: (a) the sale or termination of a line of business; (b) closure of business locations in a country or region or the relocation of activities from one country or region to another; (c) changes in management structure; and (d) fundamental reorganisations that have a material effect on the nature and focus of the entity's operations.

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