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Cash and cash equivalents | 12 Months Ended
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Dec. 31, 2018
Disclosure of Cash and cash equivalents [Line Items] |
Disclosure of cash and cash equivalents [text block] |
| 6. | Cash and cash equivalents
| (a) | This caption is made up as follows:
|  | 2018 |  |  | 2017 |
|  | US$(000) |  |  | US$(000) |
Cash |  |  | 347 |  |  |  | 327 |
Bank accounts (b) |  |  | 57,078 |  |  |  | 51,953 |
Time deposits (c) |  |  | 311,775 |  |  |  | 162,271 |
|  |  | 369,200 |  |  |  | 214,551 |
| (b) | Bank accounts earn interest at floating rates based on market rates.
| (c) | As of December 31, 2018 and 2017, 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 cash and cash equivalents [text block] |
| 5. | Cash and cash equivalents
| (a) | This caption is made up as follows:
|  | 2018 |  |  | 2017 |
|  | US$(000) |  |  | US$(000) |
Petty cash |  |  | 33 |  |  |  | 34 |
Bank accounts |  |  | 111,319 |  |  |  | 48,995 |
Term deposits (b) |  |  | 611,856 |  |  |  | 625,985 |
|  |  | 723,208 |  |  |  | 675,014 |
| (b) | The term deposit balance is made up as follows:
|  | 2018 |  |  | 2017 |
|  | US$(000) |  |  | US$(000) |
Citi Bank |  |  | 210,361 |  |  |  | 206,824 |
JP Morgan |  |  | 401,495 |  |  |  | 419,161 |
|  |  | 611,856 |  |  |  | 625,985 |
The bank accounts and term deposits yield interest at market rates. The carrying amounts approximate the fair value due to the short maturity of these balances, which are less than 90 days.
Sociedad Minera Cerro Verde S.A.A. [Member] |
Disclosure of Cash and cash equivalents [Line Items] |
Disclosure of cash and cash equivalents [text block] |
| 3. | Cash and cash equivalents
This item is made up as follows:
|  | December 31, 2018 |  |  | December 31, 2017 |
|  | US$(000) |  |  | US$(000) |
Cash in banks |  |  | 3,679 |  |  |  | 3,500 |
Cash equivalents (a) |  |  | 497,503 |  |  |  | 596,527 |
|  |  | 501,182 |  |  |  | 600,027 |
| (a) | Cash equivalents as of December 31, 2018, includes short-term deposits with Scotiabank Peru of US$125.0 million, BBVA Continental Peru of US$50.0 million, Citibank NY of US$42.9 million and Banco de Credito de Peru of US$5.9 million and a portfolio of investments in highly marketable liquid investments (investments classified as “AAA” by Standard & Poor’s and Moody’s) of US$273.7 million, 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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