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Non-controlling interests - Summary of non-controlling interests in subsidiaries (Details) - USD ($)
 12 Months Ended
May 11, 2020
Dec. 31, 2021
Dec. 31, 2020
Disclosure of subsidiaries [line items]      
Current assets   $ 728,235,000 $ 754,096,000
Current liabilities   (206,650,000) (262,037,000)
Carrying amount of NCI   69,557,000 40,873,000
Net (decrease) increase in cash and cash equivalents   29,365,000 274,220,000
Revenue   940,914,000 1,026,685,000
Net earnings (loss) and comprehensive income (loss)   (135,706,000) 117,615,000
Non-controlling interests   $ 314,000 $ (7,180,000)
Deva Gold SA ("Deva")      
Disclosure of subsidiaries [line items]      
NCI percentage   19.50% 19.50%
Current assets   $ 2,638,000 $ 3,178,000
Non-current assets   422,789,000 412,251,000
Current liabilities   (209,000) (235,000)
Non-current liabilities   (178,984,000) (322,454,000)
Net assets   246,234,000 92,740,000
Carrying amount of NCI   67,294,000 37,520,000
Cash flows used in operating activities   (3,683,000) (3,750,000)
Cash flows generated from (used in) investing activities   0 10,000
Cash flows generated from financing activities   2,917,000 4,754,000
Net (decrease) increase in cash and cash equivalents   (766,000) 1,014,000
Revenue   0 0
Net earnings (loss) and comprehensive income (loss)   9,297,000 (27,604,000)
Non-controlling interests   $ 1,813,000 $ (5,383,000)
Hellas Gold SA ("Hellas")      
Disclosure of subsidiaries [line items]      
NCI percentage 5.00%   0.00%
Current assets     $ 0
Non-current assets     0
Current liabilities     0
Non-current liabilities     0
Net assets     0
Carrying amount of NCI     0
Cash flows used in operating activities     (6,535,000)
Cash flows generated from (used in) investing activities     (16,708,000)
Cash flows generated from financing activities     18,927,000
Net (decrease) increase in cash and cash equivalents     (4,316,000)
Revenue     65,781,000
Net earnings (loss) and comprehensive income (loss)     (33,824,000)
Non-controlling interests     $ (1,691,000)