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Other operating expenses - Other operating expenses (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Excess of salaries limit of workers profit sharing $ 17,146    
Royalty non-income tax (b) 10,780    
Optimization and prefeasibility/feasibility studies (c) 8,429 $ 14,919 $ 450
Other expenses 1,425 2,895 2,434
Tax contingencies 704 6,119 10,711
Fines and penalties (d)   14,183  
Royalties, ITAN and penalties (e)     55,088
Other operating expense $ 38,484 $ 38,116 $ 68,683