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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, 2019 $ / oz | Apr. 30, 2007 $ / oz | Jun. 30, 2019 $ / oz | Dec. 31, 2019 $ / T $ / oz | Dec. 31, 2018 $ / T $ / oz
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Silver price ($/oz) | 9.27 | 3.90 | 2.50 |  |
TURKEY |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Discount rate (as a percent) |  |  |  |  | 6.50%
TURKEY | Individual assets or cash-generating units |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  | 1,400 | 1,250
Silver price ($/oz) |  |  |  | 18 | 17
Discount rate (as a percent) |  |  |  | 5.00% |
Average factor to convert contained mineral resource ounces outside of reserves to ounces used in value beyond proven and probable calculations |  |  |  | 69.00% | 32.00%
Fair value per contained ounce of resources and exploration potential beyond proven and probable reserves |  |  |  | 110 | 50
GREECE | Individual assets or cash-generating units |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  | 1,400 |
Silver price ($/oz) |  |  |  | 18 |
Lead price ($/t) | $ / T |  |  |  | 2,100 |
Zinc price ($/t) | $ / T |  |  |  | 2,400 |
Discount rate (as a percent) |  |  |  | 6.00% | 7.00%
Average factor to convert contained mineral resource ounces outside of reserves to ounces used in value beyond proven and probable calculations |  |  |  | 27.00% | 27.00%
Fair value per contained ounce of resources and exploration potential beyond proven and probable reserves |  |  |  | 130 | 100
GREECE | Bottom of range | Individual assets or cash-generating units |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  |  | 1,275
Silver price ($/oz) |  |  |  |  | 17
Lead price ($/t) | $ / T |  |  |  |  | 2,200
Zinc price ($/t) | $ / T |  |  |  |  | 2,800
GREECE | Top of range | Individual assets or cash-generating units |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Gold price ($/oz) |  |  |  |  | 1,300
Silver price ($/oz) |  |  |  |  | 18
Lead price ($/t) | $ / T |  |  |  |  | 2,300
Zinc price ($/t) | $ / T |  |  |  |  | 2,900

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