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Non-controlling interests - Additional Information (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 11, 2020 | Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of subsidiaries [line items] |  |  |  |
Carrying amount of NCI |  | $ 69,557,000 | $ 69,557,000 | $ 40,873,000
Payments from changes in ownership interests in subsidiaries that do not result in loss of control |  |  | 0 | 7,500,000
Non-controlling interests |  |  | 314,000 | (7,180,000)
Contributed surplus |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Acquisition of non-controlling interest, without change in control |  |  | $ 0 | $ 4,172,000
Hellas Gold SA ("Hellas") |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
NCI percentage | 5.00% |  |  | 0.00%
Carrying amount of NCI |  |  |  | $ 0
Payments from changes in ownership interests in subsidiaries that do not result in loss of control | $ 7,500,000 |  |  |
Non-controlling interests |  |  |  | $ (1,691,000)
Hellas Gold SA ("Hellas") | Contributed surplus |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Acquisition of non-controlling interest, without change in control | $ 4,172,000 |  |  |
Deva Gold SA ("Deva") |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
NCI percentage |  |  | 19.50% | 19.50%
Carrying amount of NCI |  | $ 67,294,000 | $ 67,294,000 | $ 37,520,000
Ownership interest |  | 80.50% |  |
Non-controlling interests |  |  | 1,813,000 | (5,383,000)
Deva Gold SA ("Deva") | Contributed surplus |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Acquisition of non-controlling interest, without change in control |  | $ 27,961,000 |  |
Non-Material Subsidiaries |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Carrying amount of NCI |  | $ 2,263,000 | 2,263,000 | 3,353,000
Non-controlling interests |  |  | $ (1,499,000) | $ (106,000)

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- Definition The increase (decrease) in equity through changes in ownership interests in subsidiaries that do not result in loss of control. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 106 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d_iii&doctype=Standard -URIDate 2021-03-24 + Details
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