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Net sales - Revenue from contracts with customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Sales of goods [Line Items]      
Revenue from sale of gold $ 298,171 $ 362,122 $ 393,257
Less: Royalty contributions (see Note 2(k)) (12,832) (21,388) (30,884)
Revenue from sale of goods 821,930 1,106,329 1,187,206
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of gold 734,526 658,653 670,905
Less: Royalty contributions (see Note 2(k))   (23,000) (26,000)
Revenue from sale of goods 734,526 658,653 670,905
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)) (22,297) (20,385) (20,739)
Minera Yanacocha SRL and subsidiary [Member] | America - other than Peru [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of gold   139,989 179,018
Minera Yanacocha SRL and subsidiary [Member] | Switzerland [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from sale of gold $ 734,526 $ 518,664 $ 491,887