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Other current and non-current non-financial assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets $ 49,186 $ 26,883
Other non-current non-financial assets 27,540 19,262
Domestic Value Added Tax [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 20,209 11,484
Foreign Value Added Tax [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 7,211 5,122
Prepaid mining licenses [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 1,329 1,205
Prepaid insurance [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 1,763 2,446
Refund of Value Added Tax to exporters [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 12,545 941
Other taxes [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 2,800 4,027
Other Assets [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 341 215
Other non-current non-financial assets 639 770
Stain development expenses and prospecting expenses [Member]    
Disclosure of other non-financial assets [Line Items]    
Other non-current non-financial assets 26,189 17,721
Guarantee deposits [Member]    
Disclosure of other non-financial assets [Line Items]    
Other non-current non-financial assets 712 771
Other prepayment [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets $ 2,988 $ 1,443