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Commitments and contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of maturity analysis of operating lease payments [text block] | Future minimum rentals payable as of December 31 are the following:
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Within one year |  |  | 1,543 |  |  | 1,543 |
After one year but not more than five years |  |  | 6,173 |  |  | 6,173 |
More than five years |  |  | 1,157 |  |  | 2,701 |
|  |  | 8,873 |  |  | 10,417 |
Disclosure of finance lease and operating lease by lessor [text block] | The Group leases for several of its assets. These leases have purchase options. Below is a table showing future minimum lease payments and the present value of these payments:
|  | 2017 |  | 2016 |
|  |  |  | Present |  |  |  | Present |
|  | Minimum |  | value of |  | Minimum |  | value of |
|  | payments |  | payments |  | payments |  | payments |
|  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |
Within a year |  |  | 56,915 |  |  | 40,224 |  |  | 57,592 |  |  | 40,428 |
After one year but not more than five years |  |  | 267,962 |  |  | 241,651 |  |  | 318,643 |  |  | 281,192 |
Total minimum lease payments |  |  | 324,877 |  |  | 281,875 |  |  | 376,235 |  |  | 321,620 |
Less - amounts representing finance charges |  |  | (43,002) |  |  | - |  |  | (54,615) |  |  | - |
Present value of minimum lease payments |  |  | 281,875 |  |  | 281,875 |  |  | 321,620 |  |  | 321,620 |
Disclosure of detailed information about other tax assesments [Text Block] | A summary of these assessments follows:
|  |  |  | Penalty and |  |  |
Year |  | Taxes |  | interest |  | Total |
|  | US$(000) |  | US$(000) |  | US$(000) |
2003 – 2005 |  |  | 15,909 |  |  | 54,053 |  |  | 69,962 |
2006 |  |  | 6,545 |  |  | 59,454 |  |  | 65,999 |
2007 |  |  | 12,376 |  |  | 17,809 |  |  | 30,185 |
2008 |  |  | 20,797 |  |  | 12,968 |  |  | 33,765 |
2009 |  |  | 58,495 |  |  | 49,112 |  |  | 107,607 |
2010 |  |  | 65,997 |  |  | 107,139 |  |  | 173,136 |
2011 |  |  | 49,055 |  |  | 63,931 |  |  | 112,986 |
2014 - 2017 |  |  | 23,450 |  |  | - |  |  | 23,450 |
|  |  | 252,624 |  |  | 364,466 |  |  | 617,090 |
Minera Yanacocha SRL and subsidiary [Member] |
Disclosure of commitments [text block] | The Company has signed Letters of Guarantee with various financial institutions in accordance with the Mine Closure Regulation approved by Supreme Decree No.033-2005 of the Ministry of Energy and Mines. The table below sets out the outstanding signed commitments at year ends by financial institution. In general, these letters of guarantee are renewed annually.
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Banco de Credito del Peru (a) |  |  | 123,729 |  |  | 188,000 |
BBVA Continental |  |  | 190,000 |  |  | 120,000 |
Scotiabank |  |  | 190,000 |  |  | 120,000 |
|  |  | 503,729 |  |  | 428,000 |
| (a) | Letters of guarantee of Banco de Credito del Peru include US$6,321,000 and US$7,626,000 related to San Jose Reservoir Trust in 2017 and 2016, respectively.

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