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Other current and non-current non-financial assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of other non-financial assets [Line Items] |  |  |
Other current non-financial assets |  | $ 26,883 | $ 30,273
Other non-current non-financial assets |  | 19,262 | 24,690
Domestic Value Added Tax [Member] |  |  |
Disclosure of other non-financial assets [Line Items] |  |  |
Other current non-financial assets |  | 7,488 | 13,999
Foreign Value Added Tax [Member] |  |  |
Disclosure of other non-financial assets [Line Items] |  |  |
Other current non-financial assets |  | 5,122 | 2,537
Prepaid mining licenses [Member] |  |  |
Disclosure of other non-financial assets [Line Items] |  |  |
Other current non-financial assets |  | 1,205 | 1,136
Prepaid insurance [Member] |  |  |
Disclosure of other non-financial assets [Line Items] |  |  |
Other current non-financial assets |  | 2,446 | 6,323
Refund of Value Added Tax to exporters [Member] |  |  |
Disclosure of other non-financial assets [Line Items] |  |  |
Other current non-financial assets |  | 4,937 | 855
Other taxes [Member] |  |  |
Disclosure of other non-financial assets [Line Items] |  |  |
Other current non-financial assets |  | 4,027 | 4,660
Other Assets [Member] |  |  |
Disclosure of other non-financial assets [Line Items] |  |  |
Other current non-financial assets |  | 215 | 355
Other non-current non-financial assets |  | 770 | 997
Stain development expenses and prospecting expenses [Member] |  |  |
Disclosure of other non-financial assets [Line Items] |  |  |
Other non-current non-financial assets | [1] | 17,721 | 23,008
Guarantee deposits [Member] |  |  |
Disclosure of other non-financial assets [Line Items] |  |  |
Other non-current non-financial assets |  | 771 | 685
Other prepayment [Member] |  |  |
Disclosure of other non-financial assets [Line Items] |  |  |
Other current non-financial assets |  | $ 1,443 | $ 408
[1] | Reconciliation of changes in assets for exploration and mineral resource evaluation, by type

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