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Income tax and deferred taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of income tax [Abstract] |
Disclosure of detailed information about current and non-current tax assets [Text Block] |
| a) | Current tax assets
|  | 12/31/2018 |  |  | 12/31/2017 |
|  | ThUS$ |  |  | ThUS$ |
Monthly provisional income tax payments, Chilean companies |  |  | 21,172 |  |  |  | 2,802 |
Monthly provisional income tax payments, foreign companies |  |  | 5,199 |  |  |  | 808 |
Corporate tax credits (1) |  |  | 1,858 |  |  |  | 456 |
Taxes in recovery process |  |  | 28,881 |  |  |  | 28,225 |
Total |  |  | 57,110 |  |  |  | 32,291 |
| b) | Non-current tax assets
|  | 12/31/2018 |  |  | 12/31/2017 |
|  | ThUS$ |  |  | ThUS$ |
Monthly provisional income tax payments, Chilean companies |  |  | 6,398 |  |  |  | 6,398 |
Specific tax on mining activities paid (on consignment) |  |  | 25,781 |  |  |  | 25,781 |
Total |  |  | 32,179 |  |  |  | 32,179 |
| (1) | These credits are available for Companies and are related to corporate tax payments in April of the following year. These credits include, among others, credits for training expenses (SENCE), credits for acquisition of fixed assets, donations and credits in Chile for taxes paid abroad.
Disclosure of detailed information about current tax liabilities [Text Block] | Current tax liabilities
Current tax liabilities |  | 12/31/2018 |  |  | 12/31/2017 |
|  | ThUS$ |  |  | ThUS$ |
1st Category income tax |  |  | 25,163 |  |  |  | 45,479 |
Foreign company income tax |  |  | 21,097 |  |  |  | 28,996 |
Article 21 single tax |  |  | 1,152 |  |  |  | 927 |
Total |  |  | 47,412 |  |  |  | 75,402 |
Description of detailed information regarding income tax rates applicable for various countries [Text Block] | The income tax rate for the main countries where the Company operates is presented below :
Country |  | Income tax 2018 |  |  | Income tax 2017 |
Spain |  |  | 25 % |  |  |  | 25 % |
Belgium |  |  | 29.58 % |  |  |  | 33.99 % |
Mexico |  |  | 30% |  |  |  | 30 % |
United States |  |  | 21% + 6% |  |  |  | 34%+6% |
South Africa |  |  | 28% |  |  |  | 28 % |
Disclosure of deferred taxes [text block] | Income tax assets and liabilities as of December 31, 2018 are detailed as follows:
| Net liability position |
Description of deferred tax assets and liabilities |  | Assets |  |  | Liabilities |
|  | ThUS$ |  |  | ThUS$ |
Unrealized loss |  |  | 75,832 |  |  |  | - |
Property, plant and equipment and capitalized interest |  |  | - |  |  |  | (196,843 | )
Facility closure provision |  |  | 4,280 |  |  |  | - |
Manufacturing expenses |  |  | - |  |  |  | (103,760 | )
Staff severance indemnities, unemployment insurance |  |  | - |  |  |  | (5,679 | )
Vacation accrual |  |  | 5,155 |  |  |  | - |
Inventory provision |  |  | 28,155 |  |  |  | - |
Materials provision |  |  | 6,239 |  |  |  | - |
Forwards |  |  | 2,169 |  |  |  | - |
Employee benefits |  |  | 3,309 |  |  |  | - |
Research and development expenses |  |  | - |  |  |  | (2,216 | )
Accounts receivable |  |  | 4,188 |  |  |  | - |
Provision for legal complaints and expenses |  |  | 4,013 |  |  |  | - |
Loan approval expenses |  |  | - |  |  |  | (2,337 | )
Junior mining companies (valued based on stock price) |  |  | - |  |  |  | (976 | )
Royalty |  |  | - |  |  |  | (3,278 | )
Tax loss benefit |  |  | 1,124 |  |  |  | - |
Other |  |  | 5,005 |  |  |  | - |
Foreign items (other) |  |  | 259 |  |  |  | - |
Balances to date |  |  | 139,728 |  |  |  | (315,089 | )
Net balance |  |  | - |  |  |  | (175,361 | )
| d.2) | Income tax assets and liabilities as of December 31, 2017 are detailed as follows
|  | Net liability position |
Description of deferred tax assets and liabilities |  | Assets |  |  | Liabilities |
|  | ThUS$ |  |  | ThUS$ |
Unrealized loss |  |  | 68,544 |  |  |  | - |
Property, plant and equipment and capitalized interest |  |  | - |  |  |  | (211,374 | )
Facility closure provision |  |  | 3,469 |  |  |  | - |
Manufacturing expenses |  |  | - |  |  |  | (102,748 | )
Staff severance indemnities, unemployment |  |  | - |  |  |  | (6,792 | )
Vacation accrual |  |  | 4,887 |  |  |  | - |
Inventory provision |  |  | 25,172 |  |  |  | - |
Materials provision |  |  | 7,107 |  |  |  | - |
Forwards |  |  | 624 |  |  |  | - |
Employee benefits |  |  | 2,317 |  |  |  | - |
Research and development expenses |  |  | - |  |  |  | (3,501 | )
Accounts receivable |  |  | 4,253 |  |  |  | - |
Provision for legal complaints and expenses |  |  | 5,243 |  |  |  | - |
Loan approval expenses |  |  | - |  |  |  | (2,670 | )
Junior mining companies (valued based on stock price) |  |  | - |  |  |  | (2,474 | )
Royalty |  |  | - |  |  |  | (4,084 | )
Tax loss benefit |  |  | 1,437 |  |  |  | - |
Other |  |  | 5,002 |  |  |  | - |
Foreign items (other) |  |  | 305 |  |  |  | - |
Balances to date |  |  | 128,360 |  |  |  | (333,643 | )
Net balance |  |  | - |  |  |  | (205,283 | )
Disclosure of detailed information about reconciliation of changes in deferred tax liabilities assets [Text Block] |
|  | Deferred tax liability (asset) at beginning of period |  |  | Deferred tax expense (benefit) recognized in profit (loss) for the year |  |  | Deferred taxes related to items credited (charged) directly to equity |  |  | Total increases (decreases) in deferred tax liabilities (assets) |  |  | Deferred tax liability (asset) at end of period |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Unrealized loss |  |  | (68,544 | ) |  |  | (7,288 | ) |  |  | - |  |  |  | (7,288 | ) |  |  | (75,832 | )
Property, plant and equipment and capitalized interest |  |  | 211,374 |  |  |  | (14,531 | ) |  |  | - |  |  |  | (14,531 | ) |  |  | 196,843 |
Facility closure provision |  |  | (3,469 | ) |  |  | (811 | ) |  |  | - |  |  |  | (811 | ) |  |  | (4,280 | )
Manufacturing expenses |  |  | 102,748 |  |  |  | 1,012 |  |  |  | - |  |  |  | 1,012 |  |  |  | 103,760 |
Individual savings plans, unemployment insurance |  |  | 6,792 |  |  |  | (667 | ) |  |  | (446 | ) |  |  | (1,113 | ) |  |  | 5,679 |
Vacation accrual |  |  | (4,887 | ) |  |  | (268 | ) |  |  | - |  |  |  | (268 | ) |  |  | (5,155 | )
Inventory provision |  |  | (25,172 | ) |  |  | (2,983 | ) |  |  | - |  |  |  | (2,983 | ) |  |  | (28,155 | )
Materials provision |  |  | (7,107 | ) |  |  | 868 |  |  |  | - |  |  |  | 868 |  |  |  | (6,239 | )
Forwards |  |  | (624 | ) |  |  | (1,545 | ) |  |  | - |  |  |  | (1,545 | ) |  |  | (2,169 | )
Employee benefits |  |  | (2,317 | ) |  |  | (992 | ) |  |  | - |  |  |  | (992 | ) |  |  | (3,309 | )
Research and development expenses |  |  | 3,501 |  |  |  | (1,285 | ) |  |  | - |  |  |  | (1,285 | ) |  |  | 2,216 |
Accounts receivable |  |  | (4,253 | ) |  |  | 686 |  |  |  | (621 | ) |  |  | 65 |  |  |  | (4,188 | )
Provision for legal complaints and expenses |  |  | (5,243 | ) |  |  | 1,230 |  |  |  | - |  |  |  | 1,230 |  |  |  | (4,013 | )
Loan approval expenses |  |  | 2,670 |  |  |  | (333 | ) |  |  | - |  |  |  | (333 | ) |  |  | 2,337 |
Junior mining companies (valued based on stock price) |  |  | 2,474 |  |  |  | - |  |  |  | (1,498 | ) |  |  | (1,498 | ) |  |  | 976 |
Royalty |  |  | 4,084 |  |  |  | (795 | ) |  |  | (11 | ) |  |  | (806 | ) |  |  | 3,278 |
Tax loss benefit |  |  | (1,437 | ) |  |  | 313 |  |  |  | - |  |  |  | 313 |  |  |  | (1,124 | )
Other |  |  | (5,002 | ) |  |  | (64 | ) |  |  | 61 |  |  |  | (3 | ) |  |  | (5,005 | )
Foreign items (other) |  |  | (305 | ) |  |  | 46 |  |  |  | - |  |  |  | 46 |  |  |  | (259 | )
Total temporary differences, unused losses and unused tax credits |  |  | 205,283 |  |  |  | (27,407 | ) |  |  | (2,515 | ) |  |  | (29,922 | ) |  |  | 175,361 |
| d.4) | Reconciliation of changes in deferred tax liabilities (assets) as of December 31, 2017
|  | Deferred tax liability (asset) at beginning of period |  |  | Deferred tax expense (benefit) recognized in profit (loss) for the year |  |  | Deferred taxes related to items credited (charged) directly to equity |  |  | Total increases (decreases) in deferred tax liabilities (assets) |  |  | Deferred tax liability (asset) at end of period |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Unrealized loss |  |  | (86,156 | ) |  |  | 17,612 |  |  |  | - |  |  |  | 17,612 |  |  |  | (68,544 | )
Property, plant and equipment and capitalized interest |  |  | 225,124 |  |  |  | (13,750 | ) |  |  | - |  |  |  | (13,750 | ) |  |  | 211,374 |
Facility closure provision |  |  | (1,589 | ) |  |  | (1,880 | ) |  |  | - |  |  |  | (1,880 | ) |  |  | (3,469 | )
Manufacturing expenses |  |  | 110,630 |  |  |  | (7,882 | ) |  |  | - |  |  |  | (7,882 | ) |  |  | 102,748 |
Individual savings plans, unemployment insurance |  |  | 5,214 |  |  |  | 1,876 |  |  |  | (298 | ) |  |  | 1,578 |  |  |  | 6,792 |
Vacation accrual |  |  | (4,061 | ) |  |  | (826 | ) |  |  | - |  |  |  | (826 | ) |  |  | (4,887 | )
Inventory provision |  |  | (20,684 | ) |  |  | (4,488 | ) |  |  | - |  |  |  | (4,488 | ) |  |  | (25,172 | )
Materials provision |  |  | (7,776 | ) |  |  | 669 |  |  |  | - |  |  |  | 669 |  |  |  | (7,107 | )
Forwards |  |  | (10,206 | ) |  |  | 9,582 |  |  |  | - |  |  |  | 9,582 |  |  |  | (624 | )
Employee benefits |  |  | (6,783 | ) |  |  | 4,466 |  |  |  | - |  |  |  | 4,466 |  |  |  | (2,317 | )
Research and development expenses |  |  | 4,641 |  |  |  | (1,140 | ) |  |  | - |  |  |  | (1,140 | ) |  |  | 3,501 |
Accounts receivable |  |  | (4,305 | ) |  |  | 52 |  |  |  | - |  |  |  | 52 |  |  |  | (4,253 | )
Provision for legal complaints and expenses |  |  | (7,686 | ) |  |  | 2,443 |  |  |  | - |  |  |  | 2,443 |  |  |  | (5,243 | )
Loan approval expenses |  |  | 3,115 |  |  |  | (445 | ) |  |  | - |  |  |  | (445 | ) |  |  | 2,670 |
Junior mining companies (valued based on stock price) |  |  | 1,300 |  |  |  | 624 |  |  |  | 550 |  |  |  | 1,174 |  |  |  | 2,474 |
Royalty |  |  | 6,457 |  |  |  | (2,389 | ) |  |  | 16 |  |  |  | (2,373 | ) |  |  | 4,084 |
Tax loss benefit |  |  | (1,302 | ) |  |  | (135 | ) |  |  | - |  |  |  | (135 | ) |  |  | (1,437 | )
Other |  |  | (266 | ) |  |  | (4,736 | ) |  |  | - |  |  |  | (4,736 | ) |  |  | (5,002 | )
Foreign items (other) |  |  | (212 | ) |  |  | (93 | ) |  |  | - |  |  |  | (93 | ) |  |  | (305 | )
Total temporary differences, unused losses and unused tax credits |  |  | 205,455 |  |  |  | (440 | ) |  |  | 268 |  |  |  | (172 | ) |  |  | 205,283 |
Disclosure of detailed information about net operating loss carryforwards [Text Block] | As of December 31, 2018 and December 31, 2017, tax loss carryforwards are detailed as follows:
|  | 12/31/2018 |  |  | 12/31/2017 |
|  | ThUS$ |  |  | ThUS$ |
Chile |  |  | 1,125 |  |  |  | 1,437 |
Total |  |  | 1,125 |  |  |  | 1,437 |
Disclosure of detailed information about unrecognized deferred tax assets and liabilities [Text Block] | Unrecognized deferred tax assets and liabilities as of December 31, 2018 and December 31, 2017 are as follows:
|  | 12/31/2018 |  |  | 12/31/2017 |
|  | ThUS$ |  |  | ThUS$ |
|  | Assets (liabilities) |  |  | Assets (liabilities) |
Tax losses (NOLs) |  |  | 32 |  |  |  | 37 |
Doubtful accounts impairment |  |  | 47 |  |  |  | 48 |
Inventory impairment |  |  | 947 |  |  |  | 1,347 |
Pensions plan |  |  | 62 |  |  |  | 1 |
Accrued vacations |  |  | 19 |  |  |  | 19 |
Depreciation |  |  | (127 | ) |  |  | (139 | )
Other |  |  | (28 | ) |  |  | (36 | )
Balances to date |  |  | 952 |  |  |  | 1,277 |
Disclosure of detailed information about movements in deferred tax assets and liabilities [Text Block] | Movements in deferred tax assets and liabilities as of December 31, 2018 and December 31, 2017 are detailed as follows:
|  | 12/31/2018 |  |  | 12/31/2017 |
|  | ThUS$ |  |  | ThUS$ |
|  | Liabilities (assets) |  |  | Liabilities (assets) |
Deferred tax assets and liabilities, net opening balance |  |  | (205,283 | ) |  |  | (205,455 | )
Increase (decrease) in deferred taxes in profit or loss |  |  | 27,407 |  |  |  | 440 |
Increase (decrease) in deferred taxes in equity |  |  | 2,515 |  |  |  | (268 | )
Balances to date |  |  | (175,361 | ) |  |  | (205,283 | )
Disclosure of detailed information about current and deferred tax expenses income [Text Block] | Current and deferred tax expenses (income) are detailed as follows:
|  | 12/31/2018 |  |  | 12/31/2017 |  |  | 12/31/2016 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
|  | Income (expenses) |  |  | Income (expenses) |  |  | Income (expenses) |
Current income tax expense |  |  |  |  |  |  |  |  |  |  |  |
Current income tax expense |  |  | (207,959 | ) |  |  | (182,567 | ) |  |  | (149,669 | )
Adjustments to prior year current income tax |  |  | 1,577 |  |  |  | 15,954 |  |  |  | 2,080 |
Current income tax expense, net, total |  |  | (206,382 | ) |  |  | (166,613 | ) |  |  | (147,589 | )
Deferred tax expense |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax expense (income) relating to the creation and reversal of temporary differences |  |  | 27,407 |  |  |  | 440 |  |  |  | 14,624 |
Deferred tax expense, net, total |  |  | 27,407 |  |  |  | 440 |  |  |  | 14,624 |
Tax expense (income) |  |  | (178,975 | ) |  |  | (166,173 | ) |  |  | (132,965 | )
Tax expenses (income) for foreign and domestic parties are detailed as follows:
|  | 12/31/2018 |  |  | 12/31/2017 |  |  | 12/31/2016 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
|  | Income (expenses) |  |  | Income (expenses) |  |  | Income (expenses) |
Current income tax expense by foreign and domestic parties, net |  |  |  |  |  |  |  |  |  |  |  |
Current income tax expense, foreign parties, net |  |  | (7,516 | ) |  |  | (14,396 | ) |  |  | (10,844 | )
Current income tax expense, domestic, net |  |  | (198,866 | ) |  |  | (152,217 | ) |  |  | (136,745 | )
Current income tax expense, net, total |  |  | (206,382 | ) |  |  | (166,613 | ) |  |  | (147,589 | )
Deferred tax expense by foreign and domestic parties, net |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax expense, foreign parties, net |  |  | (1,885 | ) |  |  | (154 | ) |  |  | 626 |
Deferred tax expense, domestic, net |  |  | 29,292 |  |  |  | 594 |  |  |  | 13,998 |
Deferred tax expense, net, total |  |  | 27,407 |  |  |  | 440 |  |  |  | 14,624 |
Income tax expense |  |  | (178,975 | ) |  |  | (166,173 | ) |  |  | (132,965 | )
Disclosure of detailed information about tax effects of other comprehensive income components [Text Block] | Disclosures on the tax effects of other comprehensive income components:
Income tax related to other income and expense components with a charge or credit to net equity |  | Amount before taxes (expense) gain |  |  | Gains (losses) for income taxes |  |  | Amount after taxes |
|  | 12/31/2018 |  |  | 12/31/2018 |  |  | 12/31/2018 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Gain (loss) from defined benefit plans |  |  | (1,327 | ) |  |  | 396 |  |  |  | (931 | )
Cash flow hedge |  |  | 5,723 |  |  |  | - |  |  |  | 5,723 |
Reserve for gains (losses) from financial assets measured at fair value through other comprehensive income |  |  | (5,546 | ) |  |  | 1,498 |  |  |  | (4,048 | )
Total |  |  | (1,150 | ) |  |  | 1,894 |  |  |  | (744 | )
Income tax related to other income and expense components with a charge or credit to net equity |  |  | Amount before taxes (expense) gain |  |  |  | Gains (losses) for income taxes |  |  |  | Amount after taxes |
|  |  | 12/31/2017 |  |  |  | 12/31/2017 |  |  |  | 12/31/2017 |
|  |  | ThUS$ |  |  |  | ThUS$ |  |  |  | ThUS$ |
Gain (loss) from defined benefit plans |  |  | (1,401 | ) |  |  | 282 |  |  |  | (1,119 | )
Cash flow hedge |  |  | 2,184 |  |  |  | - |  |  |  | 2,184 |
Reserve for gains (losses) from financial assets measured at fair value through other comprehensive income |  |  | (26 | ) |  |  | (550 | ) |  |  | (576 | )
Total |  |  | 757 |  |  |  | (268 | ) |  |  | 489 |
Income tax related to other income and expense components with a charge or credit to net equity |  |  | Amount before taxes (expense) gain |  |  |  | Gains (losses) for income taxes |  |  |  | Amount after taxes |
|  |  | 12/31/2016 |  |  |  | 12/31/2016 |  |  |  | 12/31/2016 |
|  |  | ThUS$ |  |  |  | ThUS$ |  |  |  | ThUS$ |
Gain (loss) from defined benefit plans |  |  | (3,397 | ) |  |  | 921 |  |  |  | (2,476 | )
Cash flow hedge |  |  | 2,233 |  |  |  | (470 | ) |  |  | 1,763 |
Reserve for gains (losses) from financial assets measured at fair value through other comprehensive income |  |  | 4,813 |  |  |  | (1,300 | ) |  |  | 3,513 |
Total |  |  | 3,649 |  |  |  | (849 | ) |  |  | 2,800 |
Disclosure of reconciliation of accounting profit multiplied by applicable tax rates [Text Block] | Reconciliation of numbers in income tax expenses (income) and the result of multiplying financial gain by the rate prevailing in Chile,
|  | Income (expense) |
|  | 12/31/2018 |  |  | 12/31/2017 |  |  | 12/31/2016 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Consolidated income before taxes |  |  | 621,038 |  |  |  | 594,590 |  |  |  | 414,889 |
Income tax rate in force in Chile |  |  | 27 | % |  |  | 25.5 | % |  |  | 24 | %
Tax expense using the legal rate |  |  | (167,680 | ) |  |  | (151,620 | ) |  |  | (99,573 | )
Effect of royalty tax payments. |  |  | (4,919 | ) |  |  | (3,372 | ) |  |  | (6,311 | )
Tax effect of revenue from regular activities exempt from taxation |  |  | 1,446 |  |  |  | 2,886 |  |  |  | 2,461 |
Tax rate effect of non-tax-deductible expenses for determining taxable profit (loss) |  |  | (4,566 | ) |  |  | (4,764 | ) |  |  | (10,202 | )
Tax effect of tax rates supported abroad |  |  | (8,714 | ) |  |  | (8,061 | ) |  |  | (15,933 | )
IRS provision surplus |  |  | 3,517 |  |  |  | - |  |  |  | - |
Fines affected by Article 21 |  |  | (718 | ) |  |  | (1,517 | ) |  |  | (151 | )
Other tax effects from reconciliation between accounting gains and tax expenses |  |  | 2,659 |  |  |  | 275 |  |  |  | (3,256 | )
Tax expense using the effective rate |  |  | (178,975 | ) |  |  | (166,173 | ) |  |  | (132,965 | )

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