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Assets Held for Sale (Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]
Balance	$ 7,341
Balance	5,495	$ 7,341
Mining assets [member] | Non-current assets held for sale [member]
Disclosure of fair value measurement of assets [line items]
Balance	1,097	1,701
Transfer from property, plant and equipment		194
Disposals	(28)	(107)
Write-downs		(691)
Balance	$ 1,069	$ 1,097

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment]

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