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Other current and non-current non-financial assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets $ 50,552 $ 47,972
Other non-current non-financial assets 19,729 27,539
Domestic Value Added Tax [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 17,807 20,209
Foreign Value Added Tax [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 8,566 7,211
Prepaid mining property [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 1,244 1,329
Prepaid insurance [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 7,135 1,763
Other prepayment [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 1,423 1,774
Refund of Value Added Tax to exporters [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 10,560 12,545
Other taxes [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 3,213 2,800
Other assets [Member]    
Disclosure of other non-financial assets [Line Items]    
Other current non-financial assets 604 341
Other non-current non-financial assets 524 638
Stain development expenses and prospecting expenses [Member]    
Disclosure of other non-financial assets [Line Items]    
Other non-current non-financial assets 18,654 26,189
Guarantee deposits [Member]    
Disclosure of other non-financial assets [Line Items]    
Other non-current non-financial assets $ 551 $ 712