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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Optimization and prefeasibility/feasibility studies (a) $ 14,919 $ 450 $ 0
Fines and penalties (b) 14,183   0
Tax contingencies (c) 6,119 10,711 0
Royalties, net of asset tax (ITAN) and penalties (a)   55,088 243,798
Other expenses 2,895 2,434 15,028
Miscellaneous other operating expense $ 38,116 $ 68,683 $ 258,826