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Non-controlling interests - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 11, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |
Payments from changes in ownership interests in subsidiaries that do not result in loss of control | $ 7,500,000 | $ 7,500,000 | $ 0
Carrying amount of NCI |  | 40,873,000 | 59,304,000
Non-controlling interests |  | (7,180,000) | (6,901,000)
Contributed surplus |  |  |
Disclosure of subsidiaries [line items] |  |  |
Acquisition of non-controlling interest, without change in control |  | $ 4,172,000 | $ 0
Hellas Gold SA ("Hellas") |  |  |
Disclosure of subsidiaries [line items] |  |  |
NCI percentage | 5.00% | 0.00% | 5.00%
Carrying amount of NCI |  | $ 0 | $ 13,362,000
Non-controlling interests |  | (1,691,000) | (5,388,000)
Non-Material Subsidiaries |  |  |
Disclosure of subsidiaries [line items] |  |  |
Carrying amount of NCI |  | 3,353,000 | 3,039,000
Non-controlling interests |  | $ (106,000) | $ (247,000)

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