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Mineral resource exploration and evaluation expenditure (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |
Liabilities arising from exploration for and evaluation of mineral resources | $ 6,024 |
Property, Plant and Equipment [Member] |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | 21,013 | $ 12,163
Current Inventories [Member] |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | 521 | 674
Other Noncurrent Assets [Member] |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | $ 17,721 | $ 23,008

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- Definition The amount of assets arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2017-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2017-03-01&anchor=para_24_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of liabilities arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2017-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2017-03-01&anchor=para_24_b&doctype=Standard -URIDate 2017-03-09 + Details
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