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Provisions and contingent liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of provisions [Line Items]        
Provision for closure of mining units and exploration projects $ 225,877 $ 200,183 $ 206,462  
Provision for bonus to employees and officers 18,620 2,331    
Workers' profit sharing payable 1,772 3,569    
Provision for environmental liabilities 3,768 5,534    
Provision for obligations with communities 5,878 19,376    
Provision for labor contingencies 4,042 2,963    
Provision for safety contingencies 4,877 3,898    
Board of Directors' participation 2,108 1,273    
Provision for environmental contingencies 234 1,233    
Other provisions 758 1,364    
Provisions 267,934 241,724    
Classification by maturity [Abstract]        
Current provisions 68,172 76,847    
Non-current Portion 199,762 164,877    
Provisions 267,934 241,724    
Provision for remediation and mine closure [Member]        
Non-current provisions [abstract]        
Other non-current provisions 131,888 156,859 153,313 $ 161,270
Minera Yanacocha SRL and subsidiary [member]        
Disclosure of provisions [Line Items]        
Provision for closure of mining units and exploration projects 1,294,464 1,234,731 $ 1,012,888 $ 578,959
Provision for social responsability 18,010 21,689    
Accrual of operating costs 11,442 15,064    
Workers' profit sharing payable 3,920 1,733    
Provisions for Accruals Of Capital Expenditures 3,682 1,840    
Other provisions 2,785 1,403    
Provisions 1,334,303 1,276,460    
Classification by maturity [Abstract]        
Current provisions 41,154 39,495    
Non-current Portion 1,293,149 1,236,965    
Provisions 1,334,303 1,276,460    
Sociedad Minera Cerro Verde S.A.A. [Member]        
Current provisions [abstract]        
Other current provisions 15,357 19,202    
Non-current provisions [abstract]        
Other non-current provisions 342,331 313,663    
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for social commitments [Member]        
Current provisions [abstract]        
Other current provisions 1,815 2,767    
Sociedad Minera Cerro Verde S.A.A. [Member] | Provisions related to services and freight not invoiced [Member]        
Current provisions [abstract]        
Other current provisions 11,823 14,513    
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for remediation and mine closure [Member]        
Current provisions [abstract]        
Other current provisions 0 690    
Non-current provisions [abstract]        
Other non-current provisions 131,888 156,169    
Sociedad Minera Cerro Verde S.A.A. [Member] | Legal proceedings provision [member]        
Current provisions [abstract]        
Other current provisions 1,719 1,232    
Sociedad Minera Cerro Verde S.A.A. [Member] | Miscellaneous other provisions [member]        
Non-current provisions [abstract]        
Other non-current provisions 11,033 15,889    
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for royalties and mining tax [Member]        
Non-current provisions [abstract]        
Other non-current provisions 191,299 133,376    
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for interest [Member]        
Non-current provisions [abstract]        
Other non-current provisions $ 8,111 $ 8,229