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Deferred income tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | $ 13,551 | $ 28,912 |
Deferred tax expense (income) | (5,825) | 14,060 | $ 541
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | (7,963) | 1,301 | (3,372)
Deferred tax liability (asset) | 27,339 | 13,551 | 28,912
Deferred asset [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 179,884 | 169,171 |
Deferred tax expense (income) | 8,972 | 12,014 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 7,963 | (1,301) |
Deferred tax liability (asset) | 196,819 | 179,884 | 169,171
Deferred asset [Member] | Less - Allowance for deferred asset [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (37,012) | (18,166) |
Deferred tax expense (income) | (1,898) | (18,846) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | (38,910) | (37,012) | (18,166)
Deferred asset [Member] | Deferred asset for income tax before allowance [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 215,713 | 185,037 |
Deferred tax expense (income) | 10,790 | 30,676 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 226,503 | 215,713 | 185,037
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) | 93,050 | 78,409 |
Deferred tax expense (income) | 1,889 | 14,641 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 94,939 | 93,050 | 78,409
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) | 60,883 | 52,377 |
Deferred tax expense (income) | 734 | 8,506 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 61,617 | 60,883 | 52,377
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) | 39,538 | 32,644 |
Deferred tax expense (income) | 5,030 | 6,894 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 44,568 | 39,538 | 32,644
Deferred asset [Member] | Deferred asset for income tax before allowance [Member] | Environmental liability for Santa Barbara mine [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 1,569 | 1,556 |
Deferred tax expense (income) | (273) | 13 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 1,296 | 1,569 | 1,556
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) | 13,081 | 14,866 |
Deferred tax expense (income) | 1,082 | (1,785) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 14,163 | 13,081 | 14,866
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) | 7,592 | 5,185 |
Deferred tax expense (income) | 2,328 | 2,407 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 9,920 | 7,592 | 5,185
Deferred asset [Member] | Deferred asset included in retained earnings [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 179,841 | 169,312 |
Deferred tax expense (income) | 8,892 | 11,830 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 7,963 | (1,301) |
Deferred tax liability (asset) | 196,696 | 179,841 | 169,312
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) | 1,140 | 2,441 |
Deferred tax expense (income) | 0 | 0 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 7,963 | (1,301) |
Deferred tax liability (asset) | 9,103 | 1,140 | 2,441
Deferred asset [Member] | Deferred assets for mining royalties [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 43 | (141) |
Deferred tax expense (income) | 80 | 184 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 123 | 43 | (141)
Deferred asset [Member] | Deferred assets for mining royalties [Member] | Other temporary differences [member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 5 | 185 |
Deferred tax expense (income) | 118 | (180) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 123 | 5 | 185
Deferred asset [Member] | Deferred assets for mining royalties [Member] | Exploration expenses [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 38 | (326) |
Deferred tax expense (income) | (38) | 364 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 0 | 38 | (326)
Deferred asset [Member] | Deferred asset for income tax after allowance [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | 178,701 | 166,871 |
Deferred tax expense (income) | 8,892 | 11,830 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | 187,593 | 178,701 | 166,871
Deferred liability [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (166,333) | (140,259) |
Deferred tax expense (income) | (3,147) | (26,074) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | (169,480) | (166,333) | (140,259)
Deferred liability [Member] | Deferred liability for income tax [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (166,298) | (140,423) |
Deferred tax expense (income) | (3,021) | (25,875) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | (169,319) | (166,298) | (140,423)
Deferred liability [Member] | Deferred liability for income tax [Member] | Other temporary differences [member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (43,985) | (34,582) |
Deferred tax expense (income) | (33,618) | (9,403) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | (77,603) | (43,985) | (34,582)
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) | (70,525) | (73,537) |
Deferred tax expense (income) | 24,502 | 3,012 |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | (46,023) | (70,525) | (73,537)
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) | (51,788) | (32,304) |
Deferred tax expense (income) | 6,095 | (19,484) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | (45,693) | (51,788) | (32,304)
Deferred liability [Member] | Deferred liability for mining royalties [Member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (35) | 164 |
Deferred tax expense (income) | (126) | (199) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | (161) | (35) | 164
Deferred liability [Member] | Deferred liability for mining royalties [Member] | Other temporary differences [member] |  |  |
Disclosure of Deferred income tax [Line Items] |  |  |
Deferred tax liability (asset) | (35) | 164 |
Deferred tax expense (income) | (126) | (199) |
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | 0 | 0 |
Deferred tax liability (asset) | $ (161) | $ (35) | $ 164

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