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v3.20.1

Property, plant and equipment - Additional Information (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) $ / oz | Dec. 31, 2018 USD ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Capitalized interest |  | $ 3,848 | $ 36,750
GREECE |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  | 330,238
Impairment loss recognised in profit or loss, property, plant and equipment, net of deferred tax |  |  | $ 247,679
Individual assets or cash-generating units | TURKEY |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment | $ 117,570 | 15,269 |
Impairment loss recognised in profit or loss, property, plant and equipment, net of deferred tax | $ 94,056 | 11,910 |
Reversal (impairment) of property, plant and equipment |  | 100,492 |
Reversal (impairment) of property, plant and equipment, net of deferred tax |  | $ 80,143 |
Individual assets or cash-generating units | GREECE |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Decrease in gold price per ounce leading to impairment | $ / oz |  | 100 |
Increase in discount rate leading to impairment |  | 1.00% |
Increase in operating costs leading to impairment |  | 10.00% |
Increase in capital costs leading to impairment |  | 20.00% |

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