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Tax situation - Effect of temporary differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets [Abstract]      
Deferred tax assets $ 74,556 $ 38,305  
Deferred tax liability [Abstract]      
Deferred Tax Liabilities, Net 28,959 31,422  
Sociedad Minera Cerro Verde S.A.A. [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 110,553 158,008 $ 164,100
Deferred tax liability [Abstract]      
Deferred Tax Liabilities, Net 476,084 383,605 328,215
Deferred tax liabilities before supplementary retirement fund 365,531 225,597 164,115
Supplementary Retirement Fund [Abstract]      
Supplementary retirement fund, deferred liability 4,258 2,651 1,890
Net deferred tax liabilities 369,789 228,248 166,005
Sociedad Minera Cerro Verde S.A.A. [Member] | Royalty Accrual Deferred Tax Assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 84,546 109,505 127,475
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 17,309 15,131 12,083
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 10,742 6,050 0
Sociedad Minera Cerro Verde S.A.A. [Member] | Unpaid Vacations Deferred Tax Assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 6,618 5,937 5,293
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision For Mining Taxes Deferred Tax Assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 3,737 4,120 8,742
Sociedad Minera Cerro Verde S.A.A. [Member] | Sunat Assessments Deferred Tax Assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 0 4,055 4,077
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 1,191 2,638 2,007
Sociedad Minera Cerro Verde S.A.A. [Member] | Development Costs Deferred Tax Assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 72 122 183
Sociedad Minera Cerro Verde S.A.A. [Member] | Leases Net Assets Deferred Tax Assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 2,454 0 0
Sociedad Minera Cerro Verde S.A.A. [Member] | Other Provisions Deferred Tax Assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 10,276 10,450 4,240
Sociedad Minera Cerro Verde S.A.A. [Member] | Difference In Depreciation Method Deferred Tax Liabilities [Member]      
Deferred tax liability [Abstract]      
Deferred Tax Liabilities, Net 429,466 337,642 261,434
Sociedad Minera Cerro Verde S.A.A. [Member] | Stripping Activity Asset Deferred Tax Liabilities [Member]      
Deferred tax liability [Abstract]      
Deferred Tax Liabilities, Net 33,660 27,464 22,014
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 14,885 16,605 16,264
Sociedad Minera Cerro Verde S.A.A. [Member] | Debt Issuance Costs Deferred Tax Liabilities [Member]      
Deferred tax liability [Abstract]      
Deferred Tax Liabilities, Net 2,860 0 0
Sociedad Minera Cerro Verde S.A.A. [Member] | Lease liabilities Deferred Tax Liabilities [Member]      
Deferred tax liability [Abstract]      
Deferred Tax Liabilities, Net 933 1,894 2,663
Sociedad Minera Cerro Verde S.A.A. [Member] | Price Adjustment Of Copper Concentrates And Cathode Deferred Tax Liabilities [Member]      
Deferred tax liability [Abstract]      
Deferred Tax Liabilities, Net $ 0 $ 0 $ 25,840