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Mineral resource exploration and evaluation expenditure (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |  |
Construction in progress | $ 375,316 | $ 207,830 |
Expense arising from exploration for and evaluation of mineral resources | 5,537 | 5,864 | $ 5,322
Exploitation [Member] |  |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |  |
Assets arising from exploration for and evaluation of mineral resources | $ 8,645 | 9,791 |
Metallic exploration [Member] |  |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |  |
Useful life measured as period of time, property, plant and equipment | 10 years |  |
Expense arising from exploration for and evaluation of mineral resources | $ 165 | 0 |
Mt Holland [Member] |  |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |  |
Assets arising from exploration for and evaluation of mineral resources | 30,475 | 11,298 |
Property, Plant and Equipment [Member] |  |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |  |
Construction in progress | 12,841 | 10,292 |
Non-current assets [Member] |  |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |  |
Assets arising from exploration for and evaluation of mineral resources | 6,576 | 5,099 |
Current Inventories [Member] |  |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |  |
Assets arising from exploration for and evaluation of mineral resources | 1,367 | $ 2,028 |
Other non-current financial assets: [Member] |  |  |
Disclosure of Mineral resource exploration and evaluation expenditure [Line Items] |  |  |
Assets arising from exploration for and evaluation of mineral resources | $ 3,433 |  |

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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 2019-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2019-en-r&anchor=para_24_b&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_37&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of expense 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 2019-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2019-en-r&anchor=para_24_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_c&doctype=Standard -URIDate 2019-03-27 + Details
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