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Other current and non-current non-financial assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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

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- Definition The amount of current non-financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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