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Significant accounting policies - Summary of Wholly-owned and Partially-owned Subsidiaries (Detail) | 12 Months Ended
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Dec. 31, 2018
Turkey [member] | Tuprag Metal Madencilik Sanayi ve Ticaret AS ("Tuprag") [member] |
Disclosure of subsidiaries [line items] |
Ownership interest | 100.00%
Greece [member] | Hellas Gold SA ("Hellas") [member] |
Disclosure of subsidiaries [line items] |
Ownership interest | 95.00%
Greece [member] | Thracean Gold Mining SA [member] |
Disclosure of subsidiaries [line items] |
Ownership interest | 100.00%
Greece [member] | Thrace Minerals SA [member] |
Disclosure of subsidiaries [line items] |
Ownership interest | 100.00%
Canada [member] | Integra Gold Corp [member] |
Disclosure of subsidiaries [line items] |
Ownership interest | 100.00%
Brazil [member] | Unamgen Mineracao e Metalurgia S/A [member] |
Disclosure of subsidiaries [line items] |
Ownership interest | 100.00%
Brazil [member] | Brazauro Resources Corporation ("Brazauro") [member] |
Disclosure of subsidiaries [line items] |
Ownership interest | 100.00%
Romania [member] | Deva Gold SA ("Deva") [member] |
Disclosure of subsidiaries [line items] |
Ownership interest | 80.50%

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- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 19B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_19B_c&doctype=Standard -URIDate 2018-03-16 + Details
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