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Deferred income tax - Composition of the provision for income taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Deferred income tax [Line Items] |  |  |
Current | $ (9,924) | $ (11,911) | $ (16,882)
Deferred | (15,506) | 37,501 | (9,997)
Total income tax | (25,430) | 25,590 | (26,879)
Income Tax Expense [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Current | (8,446) | (11,851) | (12,433)
Deferred | (15,270) | 37,617 | (10,029)
Total income tax | (23,716) | 25,766 | (22,462)
Mining Royalties and Special Mining Tax [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Current | (1,478) | (60) | (4,449)
Deferred | (236) | (116) | 32
Total income tax | $ (1,714) | $ (176) | $ (4,417)

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