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Transactions with associates companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Transactions with associates companies [Line Items]      
Royalty income $ 18,638 $ 22,297 $ 20,385
Energy income 3,173 3,181 3,002
Supplies income 890 1,259 27
Minerals income 211 683 1,321
Revenue from mining concessions, property, plant and equipment 0 11 30
Purchase of supplies from related party 55 9 44
Sales of services 20,285 23,661 24,001
Interest income on loans made to related party 114 86 92
Dividends paid to non-controlling shareholders 5,140 6,500 5,560
Energy transmission [Member]      
Disclosure Of Transactions with associates companies [Line Items]      
Sales of services 320 287 393
Engineering service [Member]      
Disclosure Of Transactions with associates companies [Line Items]      
Sales of services 0 0 348
Operation and maintenance [Member]      
Disclosure Of Transactions with associates companies [Line Items]      
Sales of services 280 287 290
Administrative and Management services [Member]      
Disclosure Of Transactions with associates companies [Line Items]      
Sales of services 672 359 214
Constructions services [Member]      
Disclosure Of Transactions with associates companies [Line Items]      
Sales of services 72 4 0
Compania Minera Coimolache S.A. [Member]      
Disclosure Of Transactions with associates companies [Line Items]      
Dividends received and collected 3,649 4,011 7,623
Sociedad Minera Cerro Verde Saa [Member]      
Disclosure Of Transactions with associates companies [Line Items]      
Dividends received and collected 0 29,377 39,169
Transportadora Callao SA [Member]      
Disclosure Of Transactions with associates companies [Line Items]      
Interest income on loans made to related party 114 86 92
Newmont Peru Limited [Member]      
Disclosure Of Transactions with associates companies [Line Items]      
Dividends paid to non-controlling shareholders $ 5,140 $ 6,500 $ 5,560