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Net sales - Revenue from contracts with customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Sales of goods [Line Items]      
Revenue from sale of gold $ 229,590 $ 254,194 $ 411,877
Less: Royalty contributions (see Note 2(k)) (11,749) (12,832) (21,388)
Revenue from sale of goods 637,619 821,930 1,106,329
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of gold 592,394 734,526 658,653
Less: Royalty contributions (see Note 2(k))   (49,000) (3,600)
Revenue from sale of goods 592,394 734,526 658,653
Minera Yanacocha SRL and subsidiary [Member] | S.M.R.L. Chaupiloma Dos de Cajamarca [Member]      
Disclosure of Sales of goods [Line Items]      
Less: Royalty contributions (see Note 2(k)) (18,638) (22,297) (20,385)
Minera Yanacocha SRL and subsidiary [Member] | Switzerland      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of gold 590,002 $ 734,526 518,664
Minera Yanacocha SRL and subsidiary [Member] | America      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of gold 1,135   $ 139,989
Minera Yanacocha SRL and subsidiary [Member] | Singapore      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of gold $ 1,257