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Provisions and contingent liabilities - Movement of provision - Caption - Minera (Details) - Minera Yanacocha SRL and subsidiary [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Provisions [abstract]          
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  
Other provisions 2,484 2,785      
Provisions 1,629,190 1,315,259      
Other Accruals And Liabilities [Abstract]          
Interests payable, see note 24 16,840        
Workers' profit sharing payable 12,793 3,920      
Accrual of operating costs 11,238 11,442      
Provisions for Accruals Of Capital Expenditures 8,139 3,682      
Right of use liability 596        
Other accruals and liabilities 49,606 19,044      
Provisions, Other Accruals And Liabilities 1,678,796 1,334,303      
Classification by maturity [Abstract]          
Current portion 90,940 41,154      
Non-current portion 1,587,856 1,293,149      
Provisions, other accruals and liabilities $ 1,678,796 $ 1,334,303