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Net sales - Sales of goods (Details)
S/ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
PEN (S/)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
PEN (S/)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
PEN (S/)
Dec. 31, 2017
USD ($)
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper   $ 238,304   $ 274,761   $ 268,527
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
Sociedad Minera Cerro Verde S.A.A. [Member]            
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper   2,896,894   3,061,930   3,211,266
Less: Royalty contributions (see Note 2(k))   (6,828)   (7,904)   (8,335)
Revenue from sale of goods   2,890,066   3,054,026   3,202,931
Sociedad Minera Cerro Verde S.A.A. [Member] | Copper concentrate [Member]            
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper S/ 912,974 2,294,249 S/ 962,113 2,458,088 S/ 979,243 2,702,508
Sociedad Minera Cerro Verde S.A.A. [Member] | Copper cathode [Member]            
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper S/ 88,875 244,277 S/ 86,346 251,908 S/ 84,679 241,725
Sociedad Minera Cerro Verde S.A.A. [Member] | Other primarily silver and molybdenum concentrate [Member]            
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper   $ 358,368   $ 351,934   $ 267,033