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Income tax and deferred taxes (Details 3) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Statement [Line Items] |  |  |
Deferred tax assets | $ 161,340 | $ 138,230 |
Deferred Tax Liabilities, Net | (317,441) | (321,641) |
Deferred tax liability (asset) | (156,101) | (183,411) | $ (175,361)
Unrealized loss [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 90,585 | 82,075 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | 90,585 | 82,075 | 75,832
Property, plant and equipment and capitalized interest [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (187,168) | (197,167) |
Deferred tax liability (asset) | (187,168) | (197,167) | (196,843)
Restoration and rehabilitation provision [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 6,598 | 7,313 |
Deferred Tax Liabilities, Net | 0 | 0 |
Manufacturing expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (107,215) | (106,420) |
Deferred tax liability (asset) | (107,215) | (106,420) | (103,760)
Staff severance indemnities, unemployment insurance [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (6,669) | (6,000) |
Deferred tax liability (asset) | (6,669) | (6,000) | (5,679)
Vacation accrual [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 6,138 | 5,591 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | 6,138 | 5,591 | 5,155
Inventory provision [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 22,200 | 23,885 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | 22,200 | 23,885 | 28,155
Materials provision [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 8,812 | 7,982 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | 8,812 | 7,982 | 6,239
Forwards [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 |  |
Deferred Tax Liabilities, Net | 0 |  |
Deferred tax liability (asset) | 0 | 0 | 2,169
Employee benefits [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 2,689 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | 0 | 2,689 | 3,309
Research and development expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (3,580) | (3,533) |
Deferred tax liability (asset) | (3,580) | (3,533) | (2,216)
bad debt provision [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 5,072 | 3,542 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | 5,072 | 3,542 | 4,188
Provision for legal complaints and expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 19,637 | 2,546 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | 19,637 | 2,546 | 4,013
Loan approval expenses [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (5,212) | (3,856) |
Deferred tax liability (asset) | (5,212) | (3,856) | (2,337)
Junior mining companies valued based on stock price [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (3,929) | (1,287) |
Deferred tax liability (asset) | (3,929) | (1,287) | (976)
Royality [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 0 |
Deferred Tax Liabilities, Net | (3,014) | (1,357) |
Deferred tax liability (asset) | (3,014) | (1,357) | (3,278)
Tax loss benefit [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 844 | 2,296 |
Deferred Tax Liabilities, Net | 0 | 0 |
Deferred tax liability (asset) | 844 | 2,296 | 1,124
Other deferred tax assets [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 1,454 | 0 |
Deferred Tax Liabilities, Net | 0 | (2,021) |
Deferred tax liability (asset) | 1,454 | (2,021) | 5,005
Foreign items other [Member] |  |  |
Statement [Line Items] |  |  |
Deferred tax assets | 0 | 311 |
Deferred Tax Liabilities, Net | (654) | 0 |
Deferred tax liability (asset) | $ (654) | $ 311 | $ 259

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