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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)