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INCOME AND MINING TAXES - Temporary Differences and Unused Tax Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Temporary Differences and Unused Tax Losses    
Unrecognized deductible temporary differences and unused tax losses $ 320,422 $ 236,912
Unused tax credits not recognized as deferred tax 12,900 12,900
Taxable temporary difference not recognized as deferred income tax 474,900 410,500
Net capital loss carry forwards    
Temporary Differences and Unused Tax Losses    
Unrecognized deductible temporary differences and unused tax losses 54,503 34,298
Other deductible temporary differences    
Temporary Differences and Unused Tax Losses    
Unrecognized deductible temporary differences and unused tax losses $ 265,919 $ 202,614