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Mineral resource exploration and evaluation expenditure (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources |  | $ 8,942
Construction in progress | $ 207,830 | 165,054
Exploitation [Member] |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | 9,791 | 5,191
Mt Holland [Member] |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | 11,298 |
Property, Plant and Equipment [Member] |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |
Construction in progress | 8,355 |
Non-current assets [Member] |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | 5,099 | 12,530
Current Inventories [Member] |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | $ 2,028 | $ 521

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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 2018-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2018-03-01&anchor=para_24_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of expenditure capitalised during the construction of non-current assets that are not yet available for use. [Refer: Non-current assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_37&doctype=Standard -URIDate 2018-03-16 + Details
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