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Other (expense) income and finance costs - Additional information (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, 2020 | Dec. 31, 2019
Disclosure of other income & finance costs [Line Items] |  |  |  |  |  |  |
Income from royalty sale |  | $ 8,075,000 |  |  |  | $ 0 | $ 8,075,000
Consideration paid (received) |  | $ (8,075,000) | $ 57,500,000 |  |  |  |
Capitalized interest |  |  |  |  |  | $ 0 | $ 3,848,000
Turkey |  |  |  |  |  |  |
Disclosure of other income & finance costs [Line Items] |  |  |  |  |  |  |
Proportion of net smelter return royalty interest |  | 2.50% |  |  |  |  |
Carrying value of net smelter return royalty |  | $ 0 |  |  |  |  |
Portion of consideration paid (received) consisting of cash and cash equivalents |  | $ 3,075,000 |  |  |  |  |
Portion of consideration settled through transfer of license | $ 5,000,000 |  |  |  |  |  |
Senior notes | Lamaque |  |  |  |  |  |  |
Disclosure of other income & finance costs [Line Items] |  |  |  |  |  |  |
Capitalized interest |  |  |  | $ 3,848,000 | $ 0 |  |

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- Definition The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 40 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_40_a&doctype=Standard -URIDate 2020-01-01 + Details
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