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Deferred income tax - Reconciliation of tax expense and the accounting profit (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred income tax      
Profit (loss) before income tax $ (130,318) $ (43,535) $ 27,033
Profit (loss) for discontinued operations 5,409 (10,514) (11,808)
Profit (loss) before income tax (124,909) (54,049) 15,225
Theoretical gain (loss) for income tax 36,848 15,944 (4,491)
Effect of translation into U.S. dollars (31,853) 14,995 (15,248)
Non - deductible expenses (11,789) (6,877) (1,095)
Foreign exchange difference of permanent items (10,524) (3,081) (2,371)
Share in the results of associates (2,808) 14,074 (337)
Unrecognized deferred tax asset (2,342) (9,265) (2,038)
Deferred stripping cost (2,521) 0  
Mining royalties and special mining tax 1,273 (24) 3,118
Income tax income (expense) (23,716) 25,766 (22,462)
Mining Royalties and Special Mining Tax (1,714) (176) (4,417)
Total income tax $ (25,430) $ 25,590 $ (26,879)