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Non-controlling interests - Summary of non-controlling interests in subsidiaries (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 11, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |
Current assets |  | $ 766,232,000 | $ 435,860,000
Current liabilities |  | (262,037,000) | (221,723,000)
Carrying amount of NCI |  | 40,873,000 | 59,304,000
Cash flows used in operating activities |  | 425,607,000 | 165,826,000
Net increase (decrease) in cash and cash equivalents |  | 274,220,000 | (108,503,000)
Revenue |  | 1,026,685,000 | 617,823,000
Net loss and comprehensive loss |  | 97,361,000 | 73,685,000
Non-controlling interests |  | $ (7,180,000) | $ (6,901,000)
Hellas Gold SA ("Hellas") |  |  |
Disclosure of subsidiaries [line items] |  |  |
NCI percentage | 5.00% | 0.00% | 5.00%
Current assets |  | $ 0 | $ 67,902,000
Non-current assets |  | 0 | 1,858,544,000
Current liabilities |  | 0 | (1,050,952,000)
Non-current liabilities |  | 0 | (405,318,000)
Net assets |  | 0 | 470,176,000
Carrying amount of NCI |  | 0 | 13,362,000
Cash flows used in operating activities |  | (6,535,000) | (215,000)
Cash flows generated from (used in) investing activities |  | (16,708,000) | (45,216,000)
Cash flows generated from financing activities |  | 18,927,000 | 50,026,000
Net increase (decrease) in cash and cash equivalents |  | (4,316,000) | 4,595,000
Revenue |  | 65,781,000 | 140,156,000
Net loss and comprehensive loss |  | (33,824,000) | (107,758,000)
Non-controlling interests |  | (1,691,000) | (5,388,000)
Dividends paid to NCI |  | $ 0 | $ 0
Deva Gold SA ("Deva") |  |  |
Disclosure of subsidiaries [line items] |  |  |
NCI percentage |  | 19.50% | 19.50%
Current assets |  | $ 3,178,000 | $ 1,867,000
Non-current assets |  | 412,251,000 | 415,149,000
Current liabilities |  | (235,000) | (312,000)
Non-current liabilities |  | (322,454,000) | (294,493,000)
Net assets |  | 92,740,000 | 122,211,000
Carrying amount of NCI |  | 37,520,000 | 42,903,000
Cash flows used in operating activities |  | (3,750,000) | (4,856,000)
Cash flows generated from (used in) investing activities |  | 10,000 | (15,000)
Cash flows generated from financing activities |  | 4,754,000 | 4,803,000
Net increase (decrease) in cash and cash equivalents |  | 1,014,000 | (68,000)
Revenue |  | 0 | 0
Net loss and comprehensive loss |  | (27,604,000) | (6,494,000)
Non-controlling interests |  | (5,383,000) | (1,266,000)
Dividends paid to NCI |  | $ 0 | $ 0

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