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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