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Other operating expenses (Details) - Sociedad Minera Cerro Verde S.A.A. [Member]
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Disclosure Other operational expenses [Line Items]  
Potential liability in the form of fines and interest $ 14,183
INGEMMET  
Disclosure Other operational expenses [Line Items]  
Potential liability in the form of fines and interest 6,800
SUNAT  
Disclosure Other operational expenses [Line Items]  
Potential liability in the form of fines and interest 4,700
OSINERGMIN  
Disclosure Other operational expenses [Line Items]  
Potential liability in the form of fines and interest $ 2,700