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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Provisions [abstract]        
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
Other provisions 7,352 6,162    
Provisions 1,762,389 1,632,868    
Other Accruals And Liabilities [Abstract]        
Workers' profit sharing payable 17,311 12,793    
Accrual of operating costs 15,938 11,238    
Provisions for Accruals Of Capital Expenditures 20,147 8,139    
Provisions, Other Accruals And Liabilities 1,762,389 1,632,868    
Classification by maturity [Abstract]        
Current portion 101,786 45,317    
Non-current portion 1,660,603 1,587,551    
Provisions, other accruals and liabilities $ 1,762,389 $ 1,632,868