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Tax situation (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets [Abstract]      
Deferred tax assets $ 43,129 $ 25,881  
Deferred tax liabilitiy [Abstract]      
Deferred tax liabilities 15,790 12,330  
Sociedad Minera Cerro Verde S.A.A. [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 164,100 25,035 $ 24,271
Deferred tax liabilitiy [Abstract]      
Deferred tax liabilities 328,215 356,691 274,487
Deferred tax liabilities before supplementary retirement fund 164,115 331,656 250,216
Supplementary Retirement Fund [Abstract]      
Supplementary retirement fund, deferred liability 1,890 3,458 2,937
Net deferred tax liabilities 166,005 335,114 253,153
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 12,083 9,180 5,638
Sociedad Minera Cerro Verde S.A.A. [Member] | Unpaid vacations,deferred tax assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 5,293 4,055 2,515
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for mining taxes,deferred tax assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 8,742 4,003 1,505
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 2,007 2,321 1,682
Sociedad Minera Cerro Verde S.A.A. [Member] | Development costs,deferred tax assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 183 228 332
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 0 0 7,849
Sociedad Minera Cerro Verde S.A.A. [Member] | Other provisions,deferred tax assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 4,240 5,248 4,750
Sociedad Minera Cerro Verde S.A.A. [Member] | Difference in depreciation method,deferred tax liabilities [Member]      
Deferred tax liabilitiy [Abstract]      
Deferred tax liabilities 261,434 283,882 245,670
Sociedad Minera Cerro Verde S.A.A. [Member] | Difference in valuation of inventories,deferred tax liabilities [Member]      
Deferred tax liabilitiy [Abstract]      
Deferred tax liabilities 16,264 25,087 10,997
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 25,840 24,128 0
Sociedad Minera Cerro Verde S.A.A. [Member] | Stripping activity asset,deferred tax liabilities [Member]      
Deferred tax liabilitiy [Abstract]      
Deferred tax liabilities 22,014 23,594 17,820
Sociedad Minera Cerro Verde S.A.A. [Member] | Debt issuance costs , deferred tax liabilities [Member]      
Deferred tax liabilitiy [Abstract]      
Deferred tax liabilities 2,663 0 0
Sociedad Minera Cerro Verde S.A.A. [Member] | Royalty accrual, deferred tax assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets 127,475 0 0
Sociedad Minera Cerro Verde S.A.A. [Member] | SUNAT Assessments, deferred tax assets [Member]      
Deferred tax assets [Abstract]      
Deferred tax assets $ 4,077 $ 0 $ 0