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Other non-current receivables (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]    
Value added tax receivables $ 871 $ 707
Lindero Project [member]    
Disclosure of fair value measurement of assets [line items]    
Value added tax receivables $ 1,223 $ 562