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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