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Other operating expenses (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Other operational expenses [Line Items]    
Potential liability in the form of fines and interest $ 14,183  
Penalties for income tax related to disputed mining royalties   $ 33,800
Penalties on disputed mining royalties   17,700
Profit sharing adjustments related to GEM refund   $ 3,600
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