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Cash and cash equivalents (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Cash and cash equivalents [Line Items] |
Schedule of cash and cash equivalents [Text Block] |
| (a) | This caption is made up as follows:
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Cash |  |  | 327 |  |  | 290 |
Bank accounts (b) |  |  | 51,953 |  |  | 48,754 |
Time deposits (c) |  |  | 162,271 |  |  | 31,500 |
|  |  | 214,551 |  |  | 80,544 |
| (b) | Bank accounts earn interest at floating rates based on market rates.
| (c) | As of December 31, 2017 and 2016, time deposits were kept in prime financial institutions, which generated interest at annual market rates and had original maturities of less than 90 days, according to the immediate cash needs of the Group.
Minera Yanacocha SRL and subsidiary [Member] |
Disclosure of Cash and cash equivalents [Line Items] |
Disclosure of detailed information about cash and cash equivalents [Text Block] | This caption is made up as follows:
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Petty cash |  |  | 34 |  |  | 45 |
Bank accounts |  |  | 48,995 |  |  | 118,853 |
Term deposits (b) |  |  | 625,985 |  |  | 558,626 |
|  |  | 675,014 |  |  | 677,524 |
Disclosure of detailed information about term deposits [Text Block] | The term deposits balance is made as follows:
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Citi Bank |  |  | 206,824 |  |  | 150,564 |
JP Morgan |  |  | 419,161 |  |  | 408,062 |
|  |  | 625,985 |  |  | 558,626 |
Sociedad Minera Cerro Verde S.A.A. [Member] |
Disclosure of Cash and cash equivalents [Line Items] |
Disclosure of detailed information about cash and cash equivalents [Text Block] | This item is made up as follows:
|  |  | December 31, |  |  | December 31, |
|  |  | 2017 |  |  | 2016 |
|  |  | US$(000) |  |  | US$(000) |
Cash in banks |  |  | 3,500 |  |  | 2,990 |
Cash equivalents (a) |  |  | 596,527 |  |  | 26,961 |
|  |  | 600,027 |  |  | 29,951 |
| (a) | Cash equivalents as of December 31, 2017, includes short-term deposits with Citibank NY of US$196 million, Scotiabank Peru of US$150 million and BBVA Continental Peru of US$50 million and a portfolio of investments in highly marketable liquid investments of US$200.5 million, (investments classified as “AAA” by Standard & Poor’s and Moody’s), which yield variable returns, and are classified as cash equivalents because they are readily convertible to known amounts of cash and management plans to use them for its short-term cash needs. Because of the short maturity of these investments (i.e., less than 90 days), the carrying amount of these investments corresponds to their fair value at the date of the financial statements. Changes in the fair value of these investments are insignificant.

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