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Income tax and deferred taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of income tax [Abstract] |
Disclosure of detailed information about current and non-current tax assets [Text Block] | Current and non-current tax assets a) Current tax assets
|  | 12/31/2017 |  | 12/31/2016 |
|  | ThUS$ |  | ThUS$ |
Monthly provisional income tax payments, Chilean companies |  | 17,613 |  | 45,955 |
Monthly provisional payment Royalty |  | 588 |  | 3,542 |
Monthly provisional income tax payments, foreign companies |  | 1,644 |  | 1,323 |
Corporate tax credits (1) |  | 944 |  | 748 |
Corporate tax absorbed by tax losses |  | - |  | 64 |
Taxes in recovery process |  | 11,502 |  | - |
Total |  | 32,291 |  | 51,632 |
b) | Non-current tax assets
|  | 12/31/2017 |  | 12/31/2016 |
|  | 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 |
Disclosure of detailed information about current tax liabilities [Text Block] | Current tax liabilities
Current tax liabilities |  | 12/31/2017 |  | 12/31/2016 |
|  | ThUS$ |  | ThUS$ |
1st Category income tax |  | 45,479 |  | 50,174 |
Foreign company income tax |  | 28,996 |  | 25,276 |
Article 21 single tax |  | 927 |  | 422 |
Total |  | 75,402 |  | 75,872 |
Disclosure of deferred taxes [text block] | 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 |  | 211,435 |  | - |
Facility closure provision |  | - |  | (3,469) |
Manufacturing expenses |  | 102,748 |  | - |
Staff severance indemnities ,unemployment insurance |  | 6,792 |  | - |
Vacation accrual |  | - |  | (4,887) |
Inventory provision |  | - |  | (25,098) |
Materials provision |  | - |  | (7,107) |
Forwards |  | - |  | (624) |
Employee benefits |  | - |  | (2,317) |
Research and development expenses |  | 3,501 |  | - |
Accounts receivable |  | - |  | (4,222) |
Provision for legal complaints and expenses |  | - |  | (10,750) |
Loan approval expenses |  | 2,670 |  | - |
Junior mining companies (valued based on stock price) |  | 2,474 |  | - |
Royalty |  | 4,084 |  | - |
Tax loss benefit |  | - |  | (1,437) |
Other |  | 544 |  | - |
Foreign items (other) |  | - |  | (510) |
Balances to date |  | 334,248 |  | (128,965) |
Net balance |  | 205,283 |  | - |
Income tax assets and liabilities as of December 31, 2016 are detailed as follows
|  | Net liability position |
Description of deferred tax assets and liabilities |  | Assets |  | Liabilities |
|  | ThUS$ |  | ThUS$ |
Unrealized loss |  |  | - |  |  | (86,156) |
Property, plant and equipment and capitalized interest |  |  | 225,124 |  |  | - |
Facility closure provision |  |  | - |  |  | (1,590) |
Manufacturing expenses |  |  | 110,630 |  |  | - |
Staff severance indemnities ,unemployment |  |  | 5,214 |  |  | - |
Vacation accrual |  |  | - |  |  | (4,061) |
Inventory provision |  |  | - |  |  | (20,608) |
Materials provision |  |  | - |  |  | (7,776) |
Forwards |  |  | - |  |  | (10,206) |
Employee benefits |  |  | - |  |  | (6,783) |
Research and development expenses |  |  | 4,641 |  |  | - |
Accounts receivable |  |  | - |  |  | (4,273) |
Provision for legal complaints and expenses |  |  | - |  |  | (7,686) |
Loan approval expenses |  |  | 3,115 |  |  | - |
Junior mining companies (valued based on stock price) |  |  | 1,300 |  |  | - |
Royalty |  |  | 6,457 |  |  | - |
Tax loss benefit |  |  | - |  |  | (1,302) |
Other |  |  | 79 |  |  | - |
Foreign items (other) |  |  | - |  |  | (664) |
Balances to date |  |  | 356,560 |  |  | (151,105) |
Net balance |  |  | 205,455 |  |  | - |
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 2017 |  | Income tax 2016 |
Spain |  | 25% |  | 25% |
Mexico |  | 30% |  | 30% |
South Africa |  | 28% |  | 28% |
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) |
|  |  | 12/31/2017 |  |  | 12/31/2016 |  |  | 12/31/2015 |
|  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Consolidated income before taxes |  |  | 595,639 |  |  | 414,889 |  |  | 301,098 |
Income tax rate in force in Chile |  |  | 25.5 | % |  | 24 | % |  | 22.5 | %
Tax expense using the legal rate |  |  | (151,888) |  |  | (99,573) |  |  | (67,747) |
Effect of royalty tax expense and passive income |  |  | (3,529) |  |  | (6,311) |  |  | (9,157) |
Tax effect of non-taxable revenue |  |  | 1,746 |  |  | 2,461 |  |  | 1,511 |
Effect of taxable rate of non-deductible expenses for determination of taxable income (loss) |  |  | (4,594) |  |  | (10,202) |  |  | (4,350) |
Tax effect of tax rates supported abroad |  |  | (6,409) |  |  | (15,933) |  |  | (3,968) |
Effect of changes in tax rate |  |  | 2,414 |  |  | (3,629) |  |  | - |
Other tax effects from the reconciliation between the accounting income and tax expense |  |  | (3,913) |  |  | 222 |  |  | (55) |
Tax expense using the effective rate |  |  | (166,173) |  |  | (132,965) |  |  | (83,766) |
Disclosure of detailed information about reconciliation of changes in deferred tax liabilities assets [Text Block] | 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 |  | (13,689) |  | - |  | (13,689) |  | 211,435 |
Facility closure provision |  | (1,590) |  | (1,879) |  | - |  | (1,879) |  | (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 |  | (20,608) |  | (4,490) |  | - |  | (4,490) |  | (25,098) |
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 |  | (4,273) |  | 51 |  | - |  | 51 |  | (4,222) |
Provision for legal complaints and expenses |  | (7,686) |  | (3,064) |  | - |  | (3,064) |  | (10,750) |
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 |  | 79 |  | 465 |  | - |  | 465 |  | 544 |
Foreign items (other) |  | (664) |  | 154 |  | - |  | 154 |  | (510) |
Total temporary differences, unused losses and unused tax credits |  | 205,455 |  | (440) |  | 268 |  | (172) |  | 205,283 |
Reconciliation of changes in deferred tax liabilities (assets) as of December 31, 2016
|  | 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 |  | (87,440) |  | 1,284 |  | - |  | 1,284 |  | (86,156) |
Property, plant and equipment and capitalized interest |  | 236,094 |  | (10,970) |  | - |  | (10,970) |  | 225,124 |
Facility closure provision |  | - |  | (1,590) |  | - |  | (1,590) |  | (1,590) |
Manufacturing expenses |  | 109,134 |  | 1,496 |  | - |  | 1,496 |  | 110,630 |
Individual savings plans, unemployment insurance |  | 4,155 |  | 1,980 |  | (921) |  | 1,059 |  | 5,214 |
Vacation accrual |  | (3,372) |  | (689) |  | - |  | (689) |  | (4,061) |
Inventory provision |  | (29,428) |  | 8,820 |  | - |  | 8,820 |  | (20,608) |
Materials provision |  | - |  | (7,776) |  | - |  | (7,776) |  | (7,776) |
Forwards |  | (12,322) |  | 1,646 |  | 470 |  | 2,116 |  | (10,206) |
Employee benefits |  | (1,956) |  | (4,827) |  | - |  | (4,827) |  | (6,783) |
Research and development expenses |  | 8,247 |  | (3,606) |  | - |  | (3,606) |  | 4,641 |
Accounts receivable |  | (5,076) |  | 803 |  | - |  | 803 |  | (4,273) |
Provision for legal complaints and expenses |  | (7,357) |  | (329) |  | - |  | (329) |  | (7,686) |
Loan approval expenses |  | 3,651 |  | (536) |  | - |  | (536) |  | 3,115 |
Junior mining companies (valued based on stock price) |  | - |  | - |  | 1,300 |  | 1,300 |  | 1,300 |
Royalty |  | 6,410 |  | 47 |  | - |  | 47 |  | 6,457 |
Tax loss benefit |  | (1,525) |  | 223 |  | - |  | 223 |  | (1,302) |
Other |  | 97 |  | (18) |  | - |  | (18) |  | 79 |
Foreign items (other) |  | (82) |  | (582) |  | - |  | (582) |  | (664) |
Total temporary differences, unused losses and unused tax credits |  | 219,230 |  | (14,624) |  | 849 |  | (13,775) |  | 205,455 |
Disclosure of detailed information about net operating loss carryforwards [Text Block] | As of December 31, 2017 and December 31, 2016, tax loss carryforwards (NOL carryforwards) are detailed as follows:
|  |  | 12/31/2017 |  |  | 12/31/2016 |
|  |  | ThUS$ |  |  | ThUS$ |
Chile |  |  | 1,437 |  |  | 1,302 |
Total |  |  | 1,437 |  |  | 1,302 |
Disclosure of detailed information about unrecognized deferred tax assets and liabilities [Text Block] | Unrecognized deferred tax assets and liabilities as of December 31, 2017 and December 31, 2016 are as follows:
|  |  | 12/31/2017 |  |  | 12/31/2016 |
|  |  | ThUS$ |  |  | ThUS$ |
|  |  | Assets (liabilities) |  |  | Assets (liabilities) |
Tax losses (NOL’s) |  |  | 37 |  |  | 56 |
Doubtful accounts impairment |  |  | 48 |  |  | 79 |
Inventory impairment |  |  | 1,347 |  |  | 2,871 |
Pensions plan |  |  | 1 |  |  | 297 |
Accrued vacations |  |  | 19 |  |  | 29 |
Depreciation |  |  | (139) |  |  | (245) |
Other |  |  | (36) |  |  | (45) |
Balances to date |  |  | 1,277 |  |  | 3,042 |
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, 2017 and December 31, 2016 are detailed as follows:
|  |  | 12/31/2017 |  |  | 12/31/2016 |
|  |  | ThUS$ |  |  | ThUS$ |
|  |  | Liabilities (assets) |  |  | Liabilities (assets) |
Deferred tax assets and liabilities, net opening balance |  |  | 205,455 |  |  | 219,230 |
Increase (decrease) in deferred taxes in profit or loss |  |  | (440) |  |  | (14,624) |
Increase (decrease) in deferred taxes in equity |  |  | 268 |  |  | 849 |
Balances to date |  |  | 205,283 |  |  | 205,455 |
Disclosure of detailed information about current and deferred tax expenses income [Text Block] | Current and deferred tax expenses (income) are detailed as follows:
|  |  | 12/31/2017 |  |  | 12/31/2016 |  |  | 12/31/2015 |
|  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
|  |  | Income (expenses) |  |  | Income (expenses) |  |  | Income (expenses) |
Current income tax expense |  |  |  |  |  |  |  |  |  |
Current income tax expense |  |  | (182,122) |  |  | (149,669) |  |  | (89,869) |
Adjustments to prior year current income tax |  |  | 15,509 |  |  | 2,080 |  |  | 2,111 |
Current income tax expense, net, total |  |  | (166,613) |  |  | (147,589) |  |  | (87,758) |
Deferred tax expense |  |  |  |  |  |  |  |  |  |
Deferred tax expense (income) relating to the creation and reversal of temporary differences |  |  | 440 |  |  | 14,624 |  |  | 3,992 |
Deferred tax expense, net, total |  |  | 440 |  |  | 14,624 |  |  | 3,992 |
Tax expense (income) |  |  | (166,173) |  |  | (132,965) |  |  | (83,766) |
Disclosure of detailed information about tax expenses income for foreign and domestic parties [Text Block] | Tax expenses (income) for foreign and domestic parties are detailed as follows:
|  |  | 12/31/2017 |  |  | 12/31/2016 |  |  | 12/31/2015 |
|  |  | 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 |  |  | (14,396) |  |  | (10,844) |  |  | (5,719) |
Current income tax expense, domestic, net |  |  | (152,217) |  |  | (136,745) |  |  | (82,039) |
Current income tax expense, net, total |  |  | (166,613) |  |  | (147,589) |  |  | (87,758) |
Deferred tax expense by foreign and domestic parties, net |  |  |  |  |  |  |  |  |  |
Deferred tax expense, foreign parties, net |  |  | (154) |  |  | 626 |  |  | (232) |
Deferred tax expense, domestic, net |  |  | 594 |  |  | 13,998 |  |  | 4,224 |
Deferred tax expense, net, total |  |  | 440 |  |  | 14,624 |  |  | 3,992 |
Income tax expense |  |  | (166,173) |  |  | (132,965) |  |  | (83,766) |
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 |  |  | (Expense) income for income taxes |  |  | Amount after taxes |
|  |  | 12/31/2017 |  |  | 12/31/2017 |  |  | 12/31/2017 |
|  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Gain (loss) from defined benefit plans |  |  | (1,392) |  |  | 282 |  |  | (1,110) |
Reserve for gains (losses) from financial assets measured at fair value through other comprehensive income |  |  | (26) |  |  | (550) |  |  | (576) |
Total |  |  | (1,418) |  |  | (268) |  |  | (1,686) |
Income tax related to other income and expense components with a charge or credit to net equity |  |  | Amount before taxes (expense) gain |  |  | (Expense) income 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 |
Income tax related to components of other income and expense with a charge or credit to net equity |  |  | Amount before taxes (expense) gain |  |  | ((Expense) income for income taxes |  |  | Amount after taxes |
|  |  | 12/31/2015 |  |  | 12/31/2015 |  |  | 12/31/2015 |
|  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Gain (loss) from defined benefit plans |  |  | (174) |  |  | (309) |  |  | (483) |
Cash flow hedge |  |  | 86 |  |  | 96 |  |  | 182 |
Total |  |  | (88) |  |  | (213) |  |  | (301) |

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