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Cost of sales (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of cost of sales [Line Items]      
Depreciation and amortization $ (213,722) $ (192,647) $ (232,583)
Third parties services (12,954) (10,754) (59,612)
Other costs 15,028 24,107 26,739
Cost of sales 980,254 824,973 922,572
Sociedad Minera Cerro Verde S.A.A. [Member]      
Disclosure of cost of sales [Line Items]      
Materials and supplies 556,022 496,918 364,234
Depreciation and amortization 456,467 472,997 244,477
Labor (a) [1] 286,058 215,839 146,395
Energy 229,272 229,035 118,019
Third parties services 144,829 100,897 95,087
Change in work in process inventory 51,412 (3,789) (118,327)
Management Fees 2,867 2,793 3,565
Change in finished goods inventory 2,060 (3,951) 467
Other costs 39,251 42,301 8,087
Cost of sales $ 1,768,238 $ 1,553,040 $ 862,004
[1] Labor includes an expense of US$86.4 million related to profit sharing for the year ended December 31, 2017 (US$36.8 million for the year ended December 31, 2016 and credit of US$1.6 million for the year ended December 31, 2015).