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Income tax and deferred taxes (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | $ 175,361 | $ (205,283) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | (5,758) | (27,407) |
Deferred taxes related to items credited (charged) directly to equity | 2,292 | 2,515 |
Total increases (decreases) in deferred tax liabilities (assets) | 8,050 | (29,922) |
Deferred tax liability (asset) at end of period | (183,411) | 175,361 |
Unrealized loss [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (75,832) | (68,544) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | (6,243) | (7,288) |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | (6,243) | (7,288) |
Deferred tax liability (asset) at end of period | (82,075) | (75,832) |
Property, plant and equipment and capitalized interest [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | 196,843 | 211,374 |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 324 | (14,531) |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | 324 | (14,531) |
Deferred tax liability (asset) at end of period | 197,167 | 196,843 |
Facility closure provision [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (4,280) | (3,469) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | (3,033) | (811) |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | (3,033) | (811) |
Deferred tax liability (asset) at end of period | (7,313) | (4,280) |
Manufacturing expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | 103,760 | 102,748 |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 2,660 | 1,012 |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | 2,660 | 1,012 |
Deferred tax liability (asset) at end of period | 106,420 | 103,760 |
Staff severance indemnities, unemployment insurance [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | 5,679 | 6,792 |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,007 | (667) |
Deferred taxes related to items credited (charged) directly to equity | (686) | (446) |
Total increases (decreases) in deferred tax liabilities (assets) | 321 | (1,113) |
Deferred tax liability (asset) at end of period | 6,000 | 5,679 |
Vacation accrual [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (5,155) | (4,887) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | (436) | (268) |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | (436) | (268) |
Deferred tax liability (asset) at end of period | (5,591) | (5,155) |
Inventory provision [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (28,155) | (25,172) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 4,270 | (2,983) |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | 4,270 | (2,983) |
Deferred tax liability (asset) at end of period | (23,885) | (28,155) |
Materials provision [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (6,239) | (7,107) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | (1,743) | 868 |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | (1,743) | 868 |
Deferred tax liability (asset) at end of period | (7,982) | (6,239) |
Forwards [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (2,169) | (624) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | (514) | (1,545) |
Deferred taxes related to items credited (charged) directly to equity | 2,683 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | 2,169 | (1,545) |
Deferred tax liability (asset) at end of period | 0 | (2,169) |
Employee benefits [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (3,309) | (2,317) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 620 | (992) |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | 620 | (992) |
Deferred tax liability (asset) at end of period | (2,689) | (3,309) |
Research and development expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | 2,216 | 3,501 |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,317 | (1,285) |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | 1,317 | (1,285) |
Deferred tax liability (asset) at end of period | 3,533 | 2,216 |
Provision for legal complaints and expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (4,013) | (5,243) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,467 | 1,230 |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | 1,467 | 1,230 |
Deferred tax liability (asset) at end of period | (2,546) | (4,013) |
Loan approval expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | 2,337 | 2,670 |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 1,519 | (333) |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | 1,519 | (333) |
Deferred tax liability (asset) at end of period | 3,856 | 2,337 |
Junior mining companies valued based on stock price [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | 976 | 2,474 |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 0 | 0 |
Deferred taxes related to items credited (charged) directly to equity | 311 | (1,498) |
Total increases (decreases) in deferred tax liabilities (assets) | 311 | (1,498) |
Deferred tax liability (asset) at end of period | 1,287 | 976 |
Royalties [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | 3,278 | 4,084 |
Deferred tax expense (benefit) recognized in profit (loss) for the year | (1,905) | (795) |
Deferred taxes related to items credited (charged) directly to equity | (16) | (11) |
Total increases (decreases) in deferred tax liabilities (assets) | (1,921) | (806) |
Deferred tax liability (asset) at end of period | 1,357 | 3,278 |
Tax loss benefit [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (1,124) | (1,437) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | (1,172) | 313 |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | (1,172) | 313 |
Deferred tax liability (asset) at end of period | (2,296) | (1,124) |
Other deferred tax assets [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (5,005) | (5,002) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 7,026 | (64) |
Deferred taxes related to items credited (charged) directly to equity | 0 | 61 |
Total increases (decreases) in deferred tax liabilities (assets) | 7,026 | (3) |
Deferred tax liability (asset) at end of period | 2,021 | (5,005) |
Foreign items other [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (259) | (305) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | (52) | 46 |
Deferred taxes related to items credited (charged) directly to equity | 0 | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | (52) | 46 |
Deferred tax liability (asset) at end of period | (311) | (259) |
Accounts Receivable [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets and liabilities, net opening balance | (4,188) | (4,253) |
Deferred tax expense (benefit) recognized in profit (loss) for the year | 646 | 686 |
Deferred taxes related to items credited (charged) directly to equity | 0 | (621) | [1]
Total increases (decreases) in deferred tax liabilities (assets) | 646 | 65 |
Deferred tax liability (asset) at end of period | $ (3,542) | $ (4,188) |
[1] | This corresponds to the adjustment to the beginning balance of the impairment provision for receivables against other reserves.

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