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CURRENT AND DEFERRED INCOME TAX - Unrecognized Deductible Temporary Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | $ 46,419 | $ 600,757
Inventory |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 0 | 11,237
Property, plant and equipment |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 3,330 | 79,336
Close down and restoration provision |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 30,677 | 38,027
Carry forward tax loss and tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 7,962 | 396,830
Mineral and foreign withholding tax |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 567 | 0
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | $ 3,883 | $ 75,327

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