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Provisions, contingent liabilities and other liabilities - Provision for remediation and mine closure (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Provisions and contingent liabilities    
Changes in estimates, Note 7 $ 37,600 $ 60,000
Provision for remediation and mine closure [Member]    
Provisions and contingent liabilities    
Beginning balance 195,900 131,888
Accretion expense 4,196 4,048
Additions, Note 7 37,569 59,964
Progressive mine closure payments in hydrometallurgy process (122)  
Final balance 237,543 195,900
Minera Yanacocha SRL and subsidiary [Member]    
Provisions and contingent liabilities    
Beginning balance 1,587,551  
Final balance 1,660,603 1,587,551
Sociedad Minera Cerro Verde Saa [Member]    
Provisions and contingent liabilities    
Beginning balance 278,419  
Final balance 307,974 278,419
Sociedad Minera Cerro Verde Saa [Member] | Provision for remediation and mine closure [Member]    
Provisions and contingent liabilities    
Beginning balance 195,659  
Final balance $ 237,387 $ 195,659