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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).

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