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TRADE AND OTHER RECEIVABLES (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]    
Trade receivables $ 14,848,000 $ 35,590,000
Value added tax receivables (note 11) 7,004,000 13,462,000
Prepayments and deposits 8,875,000 6,101,000
Income tax receivable 1,213,000 2,638,000
Other taxes receivable 4,824,000 0
Other receivables 1,288,000 646,000
Trade and other receivables 38,052,000 58,437,000
Allowance recorded against trade receivables   0
Collateral held for receivable amounts   0
Later than three months    
Disclosure of financial assets [line items]    
Trade receivables 0 $ 0
Trade and other receivables    
Disclosure of financial assets [line items]    
Allowance recorded against trade receivables 0  
Collateral held for receivable amounts $ 0