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Commitments and contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of maturity analysis of operating lease payments [text block] | Future minimum rentals payable as of December 31 are the following:
|  | 2018 |  |  | 2017 |
|  | US$(000) |  |  | US$(000) |
Within one year |  |  | 1,543 |  |  |  | 1,543 |
After one year but not more than five years |  |  | 5,787 |  |  |  | 6,173 |
More than five years |  |  | - |  |  |  | 1,157 |
|  |  | 7,330 |  |  |  | 8,873 |
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:
|  | 2018 |  |  | 2017 |
|  | Minimum payments |  |  | Present value of payments |  |  | Minimum payments |  |  | Present value of payments |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Within a year |  |  | 53,607 |  |  |  | 41,634 |  |  |  | 56,915 |  |  |  | 40,224 |
After one year but not more than five years |  |  | 210,252 |  |  |  | 200,019 |  |  |  | 267,962 |  |  |  | 241,652 |
Total minimum lease payments |  |  | 263,859 |  |  |  | 241,653 |  |  |  | 324,877 |  |  |  | 281,876 |
Less - amounts representing finance charges |  |  | (22,206 | ) |  |  | - |  |  |  | (43,001 | ) |  |  | - |
Present value of minimum lease payments |  |  | 241,653 |  |  |  | 241,653 |  |  |  | 281,876 |  |  |  | 281,876 |
Minera Yanacocha SRL and subsidiary [Member] |
Disclosure of commitments [text block] | The table below sets out the outstanding signed commitments at year ends by financial institution.
|  | 2018 |  |  | 2017 |
|  | US$(000) |  |  | US$(000) |
Banco de Credito del Peru (a) |  |  | 114,251 |  |  |  | 123,729 |
BBVA Continental |  |  | 190,000 |  |  |  | 190,000 |
Scotiabank |  |  | 235,000 |  |  |  | 190,000 |
|  |  | 539,251 |  |  |  | 503,729 |
| (a) | Letters of guarantee of Banco de Credito del Peru include US$6,321,000 related to San Jose Reservoir Trust in 2017. In 2018 letters of guarantee were not required.

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