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TRADE AND OTHER RECEIVABLES (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]    
Trade receivables $ 11,287,000 $ 14,848,000
Value added tax receivables (note 11) 12,811,000 7,004,000
Prepayments and deposits 10,880,000 8,875,000
Income tax receivable 2,947,000 1,213,000
Other taxes receivable 4,274,000 4,824,000
Other receivables 642,000 1,288,000
Trade and other receivables 42,841,000 38,052,000
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 0
Collateral held for receivable amounts $ 0 $ 0