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Deferred income tax - Differences between the accounting and tax basis (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | $ 45,597 | $ 6,883 |
Deferred tax expense (income) | 15,506 | (37,501) | $ 9,997
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | (5,440) | (813) | 9,916
Deferred income tax other income |  | 400 |
Deferred tax liability (asset) | 35,531 | 45,597 | 6,883
Deferred liability for mining royalties [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 |  |
Deferred Liability For Derivative Financial Instruments [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 |  |
Deferred asset [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 237,709 | 206,870 |
Deferred tax expense (income) | 24,023 | 30,439 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 5,440 | 0 |
Deferred income tax other income |  | 400 |
Deferred tax liability (asset) | 267,172 | 237,709 | 206,870
Deferred asset [Member] | Deferred asset for income tax before allowance [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 237,679 | 206,834 |
Deferred tax expense (income) | 24,053 | 30,445 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 400 |
Deferred tax liability (asset) | 261,732 | 237,679 | 206,834
Deferred asset [Member] | Deferred asset for income tax before allowance [Member] | Unused tax losses [member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 131,328 | 105,462 |
Deferred tax expense (income) | 27,185 | 25,866 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | 158,513 | 131,328 | 105,462
Deferred asset [Member] | Deferred asset for income tax before allowance [Member] | Difference in depreciation and amortization rates [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 61,287 | 61,390 |
Deferred tax expense (income) | 2,616 | (103) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | 63,903 | 61,287 | 61,390
Deferred asset [Member] | Deferred asset for income tax before allowance [Member] | Provision for closure of mining units, net [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 15,513 | 11,829 |
Deferred tax expense (income) | (1,313) | 3,684 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | 14,200 | 15,513 | 11,829
Deferred asset [Member] | Deferred asset for income tax before allowance [Member] | Provision for impairment of value of inventory [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 7,494 | 6,833 |
Deferred tax expense (income) | (195) | 661 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | 7,299 | 7,494 | 6,833
Deferred asset [Member] | Deferred asset for income tax before allowance [Member] | Contingent consideration liability [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 4,841 | 4,648 |
Deferred tax expense (income) | 1,671 | 193 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | 6,512 | 4,841 | 4,648
Deferred asset [Member] | Deferred asset for income tax before allowance [Member] | Other temporary differences [member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 9,168 | 9,200 |
Deferred tax expense (income) | 207 | (432) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 400 |
Deferred tax liability (asset) | 9,375 | 9,168 | 9,200
Deferred asset [Member] | Deferred asset for income tax before allowance [Member] | Impairment loss of long-lived assets [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 8,048 | 7,472 |
Deferred tax expense (income) | (6,118) | 576 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | 1,930 | 8,048 | 7,472
Deferred asset [Member] | Deferred asset included in retained earnings [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 237,679 | 206,834 |
Deferred tax expense (income) | 24,053 | 30,445 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 5,440 | 0 |
Deferred income tax other income |  | 400 |
Deferred tax liability (asset) | 267,172 | 237,679 | 206,834
Deferred asset [Member] | Deferred asset included in retained earnings [Member] | Derivative financial instruments [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 0 | 0 |
Deferred tax expense (income) | 0 | 0 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 5,440 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | 5,440 | 0 | 0
Deferred asset [Member] | Deferred assets for mining royalties [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 30 | 36 |
Deferred tax expense (income) | (30) | (6) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | 0 | 30 | 36
Deferred liability [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (192,112) | (199,987) |
Deferred tax expense (income) | (39,529) | 7,062 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 813 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | (231,641) | (192,112) | (199,987)
Deferred liability [Member] | Deferred liability for income tax [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (191,944) | (199,172) |
Deferred tax expense (income) | (39,323) | 7,228 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | (231,267) | (191,944) | (199,172)
Deferred liability [Member] | Deferred liability for income tax [Member] | Difference in depreciation and amortization rates [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (44,007) | (36,468) |
Deferred tax expense (income) | (3,028) | (7,539) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | (47,035) | (44,007) | (36,468)
Deferred liability [Member] | Deferred liability for income tax [Member] | Fair value of mining concessions [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (12,983) | (12,745) |
Deferred tax expense (income) | (1,915) | (238) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | (14,898) | (12,983) | (12,745)
Deferred liability [Member] | Deferred liability for income tax [Member] | Other temporary differences [member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (19,333) | (22,700) |
Deferred tax expense (income) | (7,036) | 3,367 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | (26,369) | (19,333) | (22,700)
Deferred liability [Member] | Deferred liability for income tax [Member] | Effect of translation into U.S. dollars [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (46,276) | (61,271) |
Deferred tax expense (income) | (31,853) | 14,995 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | (78,129) | (46,276) | (61,271)
Deferred liability [Member] | Deferred liability for income tax [Member] | Differences in amortization rates for development costs [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (69,345) | (65,988) |
Deferred tax expense (income) | 4,509 | (3,357) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | (64,836) | (69,345) | (65,988)
Deferred liability [Member] | Deferred liability for mining royalties [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (168) | (2) |
Deferred tax expense (income) | (206) | (166) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | (374) | (168) | (2)
Deferred liability [Member] | Deferred Liability For Derivative Financial Instruments [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 0 | (813) |
Deferred tax expense (income) | 0 | 0 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 813 |
Deferred income tax other income |  | 0 |
Deferred tax liability (asset) | $ 0 | $ 0 | $ (813)

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