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Property, plant and equipment - Summary of Key Assumptions Used for Assessing Recoverable Amount of Company's CGUs Versus Carrying Values (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2018 $ / oz | Apr. 30, 2007 $ / oz | Sep. 30, 2018 $ / oz | Jun. 30, 2018 $ / oz | Dec. 31, 2018 $ / T $ / oz
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Silver price ($/oz) | 6.77 | 3.90 |  | 2.50 |
Turkey [member] | Individual assets or cash-generating units [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  | 1,250 |  |
Silver price ($/oz) |  |  | 17 |  |
Discount rate |  |  | 6.50% |  |
Greece [member] | Individual assets or cash-generating units [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Discount rate |  |  |  |  | 7.00%
Greece [member] | Bottom of range [member] | Individual assets or cash-generating units [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  |  | 1,275
Silver price ($/oz) |  |  |  |  | 17
Lead price ($/t) | $ / T |  |  |  |  | 2,200
Zinc price ($/t) | $ / T |  |  |  |  | 2,800
Greece [member] | Top of range [member] | Individual assets or cash-generating units [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  |  | 1,300
Silver price ($/oz) |  |  |  |  | 18
Lead price ($/t) | $ / T |  |  |  |  | 2,300
Zinc price ($/t) | $ / T |  |  |  |  | 2,900

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- Definition The discount rate used in the current measurement of fair value less costs of disposal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph f -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_f_iii&doctype=Standard -URIDate 2018-03-16 + Details
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