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PROVISIONS - Changes in the Close Down and Restoration Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of changes in other provisions [abstract]
Balance, beginning of year	$ 58,330	$ 63,909	$ 58,920
Provision from acquisition of Seabee Gold Operation (note 3)	0	5,464
Provision removed from sale of exploration and evaluation asset (note 8)	0	(257)
Settled during the year	(926)	(838)
Accretion expense	3,380	3,624
Foreign exchange gain (loss)	396	(163)
Revisions and new estimated cash flows	(8,429)	(2,841)
Less: current portion	(978)	(8,347)
Non-current close down and restoration provision	$ 57,352	$ 55,562

X

- Definition

The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Other provisions]

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- Definition

The decrease in other provisions resulting from the transfer of those provisions to liabilities included in disposal groups classified as held for sale. [Refer: Other provisions; Disposal groups classified as held for sale [member]]

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The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions]

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The amount of non-current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs]

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The amount recognised for new other provisions. [Refer: Other provisions]

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The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions]

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The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions]

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The amount of current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs]

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