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Significant accounting policies - Summary of Wholly-owned and Partially-owned Subsidiaries (Detail)	12 Months Ended
	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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

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