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Other income & finance costs (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 30, 2019 | Jun. 30, 2019 | Apr. 30, 2007 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of other income & finance costs [Line Items] |  |  |  |  |  |  |
Other income |  |  |  |  |  | $ 11,885,000 | $ 16,281,000
Consideration paid (received) |  |  | $ 57,500,000 |  |  |  |
Capitalized interest |  |  |  |  |  | 3,848,000 | 36,750,000
Skouries |  |  |  |  |  |  |
Disclosure of other income & finance costs [Line Items] |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  |  | 36,750,000
Lamaque |  |  |  |  |  |  |
Disclosure of other income & finance costs [Line Items] |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  |  | $ 36,750,000
TURKEY |  |  |  |  |  |  |
Disclosure of other income & finance costs [Line Items] |  |  |  |  |  |  |
Other income |  | $ 8,075,000 |  |  |  |  |
Proportion of net smelter return royalty interest |  | 2.50% |  |  |  |  |
Carrying value of net smelter return royalty |  | $ 0 |  |  |  |  |
Consideration paid (received) |  | 8,075,000 |  |  |  |  |
Portion of consideration paid (received) consisting of cash and cash equivalents |  | $ 3,075,000 |  |  |  |  |
Portion of consideration settled through transfer of licence | $ 5,000,000 |  |  |  |  |  |
Senior notes | Skouries |  |  |  |  |  |  |
Disclosure of other income & finance costs [Line Items] |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  | $ 0 |
Senior notes | Lamaque |  |  |  |  |  |  |
Disclosure of other income & finance costs [Line Items] |  |  |  |  |  |  |
Capitalized interest |  |  |  | $ 3,848,000 | $ 0 |  |

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