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Other operating expenses (Tables) | 12 Months Ended
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Dec. 31, 2017
Sociedad Minera Cerro Verde S.A.A. [Member] |
Disclosure Other operational expenses [Line Items] |
Disclosure detailed information about other operational expenses [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) |
Royalties, net of asset tax (ITAN) and penalties (a) |  |  | 243,798 |  |  | - |  |  | - |
Other expenses |  |  | 15,028 |  |  | 24,107 |  |  | 26,739 |
|  |  | 258,826 |  |  | 24,107 |  |  | 26,739 |
| (a) | Represents disputed royalties for the period December 2006 through September 2011 of US$174.8 million, net asset tax (ITAN) for the years 2009 to 2013 of US$33.6 million, profit sharing adjustments related to mining royalties of US$29.2 and penalties on disputed royalties for the period December 2006 through the year 2008 of US$6.2 million. Disputed royalties and special mining taxes for the period October 2011 through the year 2013 are recognized in “income tax expense” in the statements of comprehensive income (see Note 14(b)).

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