Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 458,624	$ 391,523
Gain (loss) on revaluation of derivatives in trade receivables	392	(117)
Revenue	459,016	391,406
Gold [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	385,953	333,342
Gold Dore [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	220,382	215,739
Gold Concentrate [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	165,571	117,603
Zinc [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	39,564	30,575
Lead [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	21,625	18,272
Silver [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	11,482	6,987
Silver Dore [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,245	1,400
Silver Concentrate [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	10,237	5,587
Iron [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	2,347
Turkey [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	348,528	337,907
Revenue	348,528	337,907
Turkey [member] \| Gold Dore [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	220,382	215,739
Turkey [member] \| Gold Concentrate [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	123,960	117,603
Turkey [member] \| Zinc [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	0
Turkey [member] \| Lead [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	0
Turkey [member] \| Silver Dore [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,245	1,400
Turkey [member] \| Silver Concentrate [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	2,941	3,165
Turkey [member] \| Iron [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		0
Greece [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	110,096	51,269
Revenue	110,488	51,152
Greece [member] \| Gold Dore [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	0
Greece [member] \| Gold Concentrate [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	41,611	0
Greece [member] \| Zinc [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	39,564	30,575
Greece [member] \| Lead [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	21,625	18,272
Greece [member] \| Silver Dore [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	0
Greece [member] \| Silver Concentrate [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	7,296	2,422
Greece [member] \| Iron [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		0
Brazil [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	2,347
Revenue	0	2,347
Brazil [member] \| Gold Dore [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	0
Brazil [member] \| Gold Concentrate [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	0
Brazil [member] \| Zinc [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	0
Brazil [member] \| Lead [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	0
Brazil [member] \| Silver Dore [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	0
Brazil [member] \| Silver Concentrate [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 0	0
Brazil [member] \| Iron [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		$ 2,347

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The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. [Refer: Revenue]

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