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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)