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Cost of sales (Tables) | 12 Months Ended
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Dec. 31, 2017
Sociedad Minera Cerro Verde S.A.A. [Member] |
Disclosure of cost of sales [Line Items] |
Disclosure Of Detailed Information About Cost Of Sales [Text block] | This item is made up as follows:
|  | For the year ended |  | For the year ended |  | For the year ended |
|  | December 31, 2017 |  | December 31, 2016 |  | December 31, 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |
Materials and supplies |  |  | 556,022 |  |  | 496,918 |  |  | 364,234 |
Depreciation and amortization |  |  | 456,467 |  |  | 472,997 |  |  | 244,477 |
Labor (a) |  |  | 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 |
|  |  | 1,768,238 |  |  | 1,553,040 |  |  | 862,004 |
| (a) | 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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