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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