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Tax situation - Effect of temporary differences (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | $ 73,850 | $ 74,556 |
Deferred tax liability [Abstract] |  |  |
Deferred Tax Liabilities, Net | 38,319 | 28,959 |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 254,083 | 152,997 | $ 175,769
Deferred tax liability [Abstract] |  |  |
Deferred Tax Liabilities, Net | 645,576 | 518,528 | 401,366
Deferred tax liabilities before supplementary retirement fund | 391,493 | 365,531 | 225,597
Supplementary Retirement Fund [Abstract] |  |  |
Supplementary retirement fund, deferred liability | 4,581 | 4,258 | 2,651
Total deferred income tax liabilities, net | 396,074 | 369,789 | 228,248
Sociedad Minera Cerro Verde S.A.A. [Member] | Royalty Accrual [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 83,570 | 84,546 | 109,505
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision For Remediation And Mine Closure [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 19,937 | 17,309 | 15,131
Sociedad Minera Cerro Verde S.A.A. [Member] | Unpaid Vacations [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 7,015 | 6,618 | 5,937
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision For Mining Taxes Deferred Tax Assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 6,124 | 3,737 | 4,120
Sociedad Minera Cerro Verde S.A.A. [Member] | SUNAT Assessments |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 0 | 0 | 4,055
Sociedad Minera Cerro Verde S.A.A. [Member] | Cost of net asset for the construction of the tailing dam [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 125,621 | 30,033 | 26,449
Sociedad Minera Cerro Verde S.A.A. [Member] | Development Costs [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 59 | 72 | 122
Sociedad Minera Cerro Verde S.A.A. [Member] | Leases [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 931 | 406 |
Sociedad Minera Cerro Verde S.A.A. [Member] | Other Provisions [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 10,826 | 10,276 | 10,450
Sociedad Minera Cerro Verde S.A.A. [Member] | Difference In Depreciation Method Deferred Tax Liabilities [Member] |  |  |
Deferred tax liability [Abstract] |  |  |
Deferred Tax Liabilities, Net | 545,636 | 458,307 | 361,453
Sociedad Minera Cerro Verde S.A.A. [Member] | Stripping Activity Asset [Member] |  |  |
Deferred tax liability [Abstract] |  |  |
Deferred Tax Liabilities, Net | 43,187 | 33,661 | 27,464
Sociedad Minera Cerro Verde S.A.A. [Member] | Difference In Valuation Of Inventories Deferred Tax Liabilities [Member] |  |  |
Deferred tax liability [Abstract] |  |  |
Deferred Tax Liabilities, Net | 18,479 | 14,885 | 16,605
Sociedad Minera Cerro Verde S.A.A. [Member] | Debt Issuance Costs [Member] |  |  |
Deferred tax liability [Abstract] |  |  |
Deferred Tax Liabilities, Net | 412 | 933 | 1,894
Sociedad Minera Cerro Verde S.A.A. [Member] | Embedded derivatives for price adjustment of copper concentrate and cathode |  |  |
Deferred tax liability [Abstract] |  |  |
Deferred Tax Liabilities, Net | $ 37,862 | $ 10,742 | $ (6,050)

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