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v3.21.1

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
--- | --- | --- | --- | ---
Aug. 03, 2020 $ / oz | Apr. 30, 2007 $ / oz | Jun. 30, 2020 $ / oz | Dec. 31, 2020 $ / T $ / oz | Dec. 31, 2019 $ / T $ / oz
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Silver price ($/oz) | 11.43 | 3.90 | 2.00 |  |
GREECE | Individual assets or cash-generating units |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  |  | 1,400
Silver price ($/oz) |  |  |  |  | 18
Lead price ($/t) | $ / T |  |  |  |  | 2,100
Zinc price ($/t) | $ / T |  |  |  |  | 2,400
Discount rate |  |  |  |  | 6.00%
GREECE | Bottom of range | Individual assets or cash-generating units |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  | 1,850 |
Silver price ($/oz) |  |  |  | 25 |
Lead price ($/t) | $ / T |  |  |  | 2,000 |
Zinc price ($/t) | $ / T |  |  |  | 2,575 |
Discount rate |  |  |  | 6.00% |
GREECE | Top of range | Individual assets or cash-generating units |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  | 1,550 |
Silver price ($/oz) |  |  |  | 21 |
Lead price ($/t) | $ / T |  |  |  | 1,975 |
Zinc price ($/t) | $ / T |  |  |  | 2,400 |
Discount rate |  |  |  | 6.50% |

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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 2020-01-01 -Paragraph 130 -Subparagraph f -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_130_f_iii&doctype=Standard -URIDate 2020-01-01 + Details
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