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Deferred income tax - Composition of the provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Deferred income tax [Line Items]      
Current $ (15,633) $ (20,375) $ (9,924)
Deferred 15,592 44,046 (15,506)
Total income tax (41) 23,671 (25,430)
Income Tax Expense [Member]      
Disclosure of Deferred income tax [Line Items]      
Current (12,091) (13,128) (8,446)
Deferred 15,449 43,951 (15,270)
Total income tax 3,358 30,823 (23,716)
Mining Royalties and Special Mining Tax [Member]      
Disclosure of Deferred income tax [Line Items]      
Current (3,542) (7,247) (1,478)
Deferred 143 95 (236)
Total income tax $ (3,399) $ (7,152) $ (1,714)