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Other current and non-current non-financial assets (Details Textual)) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of other non-financial assets [Line Items] |  |
Construction in progress | $ 486,345 | $ 375,316
Metallic exploration [Member] |  |
Disclosure of other non-financial assets [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 | $ 0 | 165
Mt Holland [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | 50,127 | 30,475
Exploration and evaluation assets [member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Construction in progress | 14,265 | 12,841
Non-current assets [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | 6,576 | 6,576
Non-current assets [Member] | Other Non Current Non Financial Assets One [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | 7,011 | 8,645
Other non current financial assets [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | 4,296 | 3,433
Current Inventories [Member] |  |
Disclosure of other non-financial assets [Line Items] |  |
Assets arising from exploration for and evaluation of mineral resources | $ 1,318 | $ 1,367

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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 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2020-en-r&anchor=para_24_b&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_37&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2020-en-r&anchor=para_24_b&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The disclosure of other non-financial assets + References No definition available. + Details
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