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Provisions, contingent liabilities and other liabilities - Provision classification (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Classification by maturity [Abstract]        
Current provisions $ 68,000 $ 72,771    
Non-current Portion 252,338 221,736    
Provision for remediation and mine closure [Member]        
Non-current provisions [abstract]        
Other non-current provisions 237,543 195,900 $ 131,888  
Classification by maturity [Abstract]        
Non-current portion 237,543 195,900 131,888  
Minera Yanacocha SRL and subsidiary [Member]        
Provisions and contingent liabilities        
Provision for closure of mining units and exploration projects 1,738,428 1,608,380 1,294,464 $ 1,234,731
Provision for social responsibility 16,609 18,326 $ 18,010 $ 21,689
Accrual of operating costs 15,938 11,238    
Workers' profit sharing payable 17,311 12,793    
Provisions for Accruals Of Capital Expenditures 20,147 8,139    
Total 7,352 6,162    
Provisions 1,762,389 1,632,868    
Provisions, Other Accruals And Liabilities 1,762,389 1,632,868    
Provisions for Accruals Of Capital Expenditures 20,147 8,139    
Non-current provisions [abstract]        
Other non-current provisions 1,660,603 1,587,551    
Classification by maturity [Abstract]        
Current provisions 101,786 45,317    
Provisions 1,762,389 1,632,868    
Non-current portion 1,660,603 1,587,551    
Total 7,352 6,162    
Sociedad Minera Cerro Verde Saa [Member]        
Current provisions [abstract]        
Other current provisions 9,625 7,918    
Non-current provisions [abstract]        
Other non-current provisions 307,974 278,419    
Classification by maturity [Abstract]        
Current portion 9,625 7,918    
Non-current portion 307,974 278,419    
Sociedad Minera Cerro Verde Saa [Member] | Provision for social commitments [Member]        
Current provisions [abstract]        
Other current provisions 9,469 7,677    
Non-current provisions [abstract]        
Other non-current provisions 1,226 3,046    
Classification by maturity [Abstract]        
Current portion 9,469 7,677    
Non-current portion 1,226 3,046    
Sociedad Minera Cerro Verde Saa [Member] | Provision for remediation and mine closure [Member]        
Current provisions [abstract]        
Other current provisions 156 241    
Non-current provisions [abstract]        
Other non-current provisions 237,387 195,659    
Classification by maturity [Abstract]        
Current portion 156 241    
Non-current portion 237,387 195,659    
Sociedad Minera Cerro Verde Saa [Member] | Provision for disputed mining royalties (c )        
Non-current provisions [abstract]        
Other non-current provisions 44,982 62,797    
Classification by maturity [Abstract]        
Non-current portion 44,982 62,797    
Sociedad Minera Cerro Verde Saa [Member] | Provision for legal contingencies [member]        
Non-current provisions [abstract]        
Other non-current provisions 1,924 4,800    
Classification by maturity [Abstract]        
Non-current portion 1,924 4,800    
Sociedad Minera Cerro Verde Saa [Member] | Miscellaneous other provisions [member]        
Classification by maturity [Abstract]        
Non-current Portion $ 22,455 $ 12,117