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v3.19.1

Tax situation (Details 4) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | $ 38,305 | $ 43,129 |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred Tax Liabilities, Net | 31,422 | 15,790 |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 158,008 | 164,100 | $ 25,035
Deferred tax liabilitiy [Abstract] |  |  |
Deferred Tax Liabilities, Net | 383,605 | 328,215 | 356,691
Deferred tax liabilities before supplementary retirement fund | 225,597 | 164,115 | 331,656
Supplementary Retirement Fund [Abstract] |  |  |
Supplementary retirement fund, deferred liability | 2,651 | 1,890 | 3,458
Net deferred tax liabilities | 228,248 | 166,005 | 335,114
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for remediation and mine closure,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 15,131 | 12,083 | 9,180
Sociedad Minera Cerro Verde S.A.A. [Member] | Unpaid vacations,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 5,937 | 5,293 | 4,055
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for mining taxes,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 4,120 | 8,742 | 4,003
Sociedad Minera Cerro Verde S.A.A. [Member] | Cost of net asset for construction of tailing dam,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 2,638 | 2,007 | 2,321
Sociedad Minera Cerro Verde S.A.A. [Member] | Development costs,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 122 | 183 | 228
Sociedad Minera Cerro Verde S.A.A. [Member] | Price adjustment of copper concentrates and cathode,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 6,050 | 0 | 0
Sociedad Minera Cerro Verde S.A.A. [Member] | Other provisions,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 10,450 | 4,240 | 5,248
Sociedad Minera Cerro Verde S.A.A. [Member] | Difference in depreciation method,deferred tax liabilities [Member] |  |  |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred Tax Liabilities, Net | 337,642 | 261,434 | 283,882
Sociedad Minera Cerro Verde S.A.A. [Member] | Difference in valuation of inventories,deferred tax liabilities [Member] |  |  |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred Tax Liabilities, Net | 16,605 | 16,264 | 25,087
Sociedad Minera Cerro Verde S.A.A. [Member] | Price adjustment of copper concentrates and cathode,deferred tax liabilities [Member] |  |  |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred Tax Liabilities, Net | 0 | 25,840 | 24,128
Sociedad Minera Cerro Verde S.A.A. [Member] | Stripping activity asset,deferred tax liabilities [Member] |  |  |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred Tax Liabilities, Net | 27,464 | 22,014 | 23,594
Sociedad Minera Cerro Verde S.A.A. [Member] | Debt issuance costs , deferred tax liabilities [Member] |  |  |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred Tax Liabilities, Net | 1,894 | 2,663 | 0
Sociedad Minera Cerro Verde S.A.A. [Member] | Royalty accrual, deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 109,505 | 127,475 | 0
Sociedad Minera Cerro Verde S.A.A. [Member] | SUNAT Assessments, deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | $ 4,055 | $ 4,077 | $ 0

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