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Cost of sales (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of cost of sales [Line Items]      
Depreciation and amortization $ 241,286 $ 213,722 $ 192,647
Third parties services (4,318) (12,954) (10,754)
Other costs 13,595 15,028 24,107,000
Cost of sales 982,957 980,254 824,973
Sociedad Minera Cerro Verde S.A.A. [Member]      
Disclosure of cost of sales [Line Items]      
Materials and supplies 693,316 556,022 496,918
Depreciation and amortization 0 0 0
Labor (a) [1] 357,692 286,058 215,839
Energy 254,243 229,272 229,035
Third parties services 0 0 0
Change in work in process inventory (8,513) 51,412 (3,789)
Management Fees 2,743 2,867 2,793
Change in finished goods inventory (5,723) 2,060 (3,951)
Other costs 45,402 39,251 42,301
Cost of sales $ 2,216,663 $ 1,768,238 $ 1,553,040
[1] Labor includes an expense of US$60.2 million related to profit sharing for the year ended December 31, 2018 (US$86.4 million for the year ended December 31, 2017). Additionally, it includes an expense of US$69.0 million related to the Union Agreement bonus payment obtained by workers as part of the new collective labor agreement, which is effective from September 1, 2018, through August 31, 2021