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Discontinued operations - Results from Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Disclosure of analysis of single amount of discontinued operations [line items]      
Net loss from discontinued operations, net of tax   $ (146,802) $ (6,352)
BRAZIL      
Disclosure of analysis of single amount of discontinued operations [line items]      
Expenses   (1,004) (3,763)
Impairment of property and equipment   (160,140) 0
Loss from operations   (157,812) (1,312)
Income tax expense   (11,010) 5,040
Net loss from discontinued operations, net of tax   $ (146,802) $ (6,352)
Basic loss per share attributable to shareholders of the Company (in dollars per share)   $ (0.81) $ (0.04)
Diluted loss per share attributable to shareholders of the Company (in dollars per share)   $ (0.81) $ (0.04)
Tocantinzinho | BRAZIL      
Disclosure of analysis of single amount of discontinued operations [line items]      
Gain on disposition of mine   $ 3,332 $ 0
Vila Nova      
Disclosure of analysis of single amount of discontinued operations [line items]      
Gain on disposition of mine $ 2,451    
Vila Nova | BRAZIL      
Disclosure of analysis of single amount of discontinued operations [line items]      
Gain on disposition of mine   $ 0 $ 2,451