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Cash and cash equivalents (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Disclosure of Cash and cash equivalents [Line Items] |  |  |  |  |
Petty cash |  | $ 327 | $ 290 |  |
Bank accounts | [1] | 51,953 | 48,754 |  |
Time deposits | [2] | 162,271 | 31,500 |  |
Cash and cash equivalents |  | 214,551 | 80,544 | $ 78,519 | $ 78,512
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Disclosure of Cash and cash equivalents [Line Items] |  |  |  |  |
Petty cash |  | 34 | 45 |  |
Bank accounts |  | 48,995 | 118,853 |  |
Time deposits | [3] | 625,985 | 558,626 |  |
Cash and cash equivalents |  | 675,014 | 677,524 |  |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |  |
Disclosure of Cash and cash equivalents [Line Items] |  |  |  |  |
Bank accounts |  | 3,500 | 2,990 |  |
Cash equivalents (a) |  | 596,527 | 26,961 |  |
Cash and cash equivalents |  | $ 600,027 | $ 29,951 |  |
[1] | Bank accounts earn interest at floating rates based on market rates.
[2] | 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.
[3] | The bank accounts and term deposits yield interest at market rates. Because of the short maturity of these balances, less than 90 days, the carrying amounts approximate to their fair value.

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_i&doctype=Standard -URIDate 2017-03-09 + Details
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