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Net sales - Sales of goods (Details)
S/ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
PEN (S/)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
PEN (S/)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
PEN (S/)
Dec. 31, 2018
USD ($)
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper   $ 181,311   $ 238,304   $ 274,761
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
Sociedad Minera Cerro Verde S.A.A. [Member]            
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper   2,538,593   2,896,894   3,061,930
Less: Royalty contributions (see Note 2(k))   (2,000)   (2,923)   (2,743)
Revenue from sale of goods   2,538,593   2,896,894   3,061,930
Sociedad Minera Cerro Verde S.A.A. [Member] | Copper concentrate [Member]            
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper S/ 743,274 2,088,167 S/ 912,974 2,294,249 S/ 962,113 2,458,088
Sociedad Minera Cerro Verde S.A.A. [Member] | Copper cathode [Member]            
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper S/ 83,870 241,808 S/ 88,875 244,277 S/ 86,346 251,908
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   $ 208,618   $ 358,368   $ 351,934