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Other current and non-current non-financial assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of other non-financial assets [Line Items] |  |
Other current non-financial assets | $ 57,399 | $ 50,552
Other non-current non-financial assets | 22,042 | 19,729
Domestic Value Added Tax [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Other current non-financial assets | 18,107 | 17,807
Foreign Value Added Tax [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Other current non-financial assets | 7,785 | 8,566
Prepaid mining licenses [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Other current non-financial assets | 1,025 | 1,244
Prepaid insurance [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Other current non-financial assets | 10,307 | 7,135
Other prepayment [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Other current non-financial assets | 946 | 1,423
Refund of Value Added Tax to exporters [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Other current non-financial assets | 14,316 | 10,560
Other taxes [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Other current non-financial assets | 4,499 | 3,213
Other assets [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Other current non-financial assets | 414 | 604
Other non-current non-financial assets | 3,428 | 524
Exploration and evaluation expenses [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Other non-current non-financial assets | 17,883 | 18,654
Guarantee deposits [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Other non-current non-financial assets | $ 731 | $ 551

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