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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
Optimization and prefeasibility/feasibility studies (c) $ 5,929 $ 8,429 $ 14,919
Tax contingencies 1,903 704 6,119
Other expenses 678 1,425 2,895
Royalty non-income tax (b)   10,780  
Excess of salaries limit of workers profit sharing   17,146  
Fines and penalties (d)     14,183
Other operating expense $ 8,510 $ 38,484 $ 38,116