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Provisions, contingent liabilities and other liabilities - Provision classification (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Classification by maturity [Abstract]          
Current provisions $ 72,771 $ 68,172      
Non-current Portion 221,736 199,762      
Provision for remediation and mine closure [Member]          
Non-current provisions [abstract]          
Other non-current provisions 195,900 131,888 $ 156,859 $ 153,313  
Minera Yanacocha SRL and subsidiary [Member]          
Provisions and contingent liabilities          
Provision for closure of mining units and exploration projects 1,608,380 1,294,464 1,234,731   $ 1,012,888
Provision for social responsibility 18,326 18,010 $ 21,689 $ 24,335  
Accrual of operating costs 11,238 11,442      
Workers' profit sharing payable 12,793 3,920      
Provisions for Accruals Of Capital Expenditures 8,139 3,682      
Other provisions 2,484 2,785      
Provisions 1,629,190 1,315,259      
Other accruals and liabilities 49,606 19,044      
Provisions, Other Accruals And Liabilities 1,678,796 1,334,303      
Provisions for Accruals Of Capital Expenditures 8,139 3,682      
Classification by maturity [Abstract]          
Current provisions 90,940 41,154      
Provisions 1,629,190 1,315,259      
Sociedad Minera Cerro Verde Saa [Member]          
Current provisions [abstract]          
Other current provisions 35,863 15,357      
Non-current provisions [abstract]          
Other non-current provisions 278,419 342,331      
Sociedad Minera Cerro Verde Saa [Member] | Services and freight not invoiced          
Current provisions [abstract]          
Other current provisions 27,945 11,823      
Sociedad Minera Cerro Verde Saa [Member] | Provision for social commitments [Member]          
Current provisions [abstract]          
Other current provisions 7,677 1,815      
Non-current provisions [abstract]          
Other non-current provisions 3,046 8,111      
Sociedad Minera Cerro Verde Saa [Member] | Provision for remediation and mine closure [Member]          
Current provisions [abstract]          
Other current provisions 241        
Non-current provisions [abstract]          
Other non-current provisions 195,659 131,888      
Sociedad Minera Cerro Verde Saa [Member] | Provision for legal contingencies [member]          
Current provisions [abstract]          
Other current provisions 0 1,719      
Non-current provisions [abstract]          
Other non-current provisions 4,800        
Sociedad Minera Cerro Verde Saa [Member] | Miscellaneous other provisions [member]          
Classification by maturity [Abstract]          
Non-current Portion 12,117 11,033      
Sociedad Minera Cerro Verde Saa [Member] | Provision for royalties and mining tax [Member]          
Non-current provisions [abstract]          
Other non-current provisions $ 62,797 $ 191,299