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Cost of sales (Tables) | 12 Months Ended
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Dec. 31, 2018
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 December 31, 2018 |  |  | For the year ended December 31, 2017 |  |  | For the year ended December 31, 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Materials and supplies |  |  | 693,316 |  |  |  | 556,022 |  |  |  | 496,918 |
Depreciation and amortization |  |  | 512,298 |  |  |  | 456,467 |  |  |  | 472,997 |
Labor (a) |  |  | 357,692 |  |  |  | 286,058 |  |  |  | 215,839 |
Energy |  |  | 254,243 |  |  |  | 229,272 |  |  |  | 229,035 |
Third parties services |  |  | 159,514 |  |  |  | 144,829 |  |  |  | 100,897 |
Management Fees |  |  | 2,743 |  |  |  | 2,867 |  |  |  | 2,793 |
Change in work in process inventory |  |  | (8,513 | ) |  |  | 51,412 |  |  |  | (3,789 | )
Change in finished goods inventory |  |  | (5,723 | ) |  |  | 2,060 |  |  |  | (3,951 | )
Other costs |  |  | 45,402 |  |  |  | 39,251 |  |  |  | 42,301 |
|  |  | 2,010,972 |  |  |  | 1,768,238 |  |  |  | 1,553,040 |
| (a) | 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 and US$36.8 million for the year ended December 31, 2016). 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.

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