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Cash and cash equivalents (Details 1) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Cash and cash equivalents [Line Items] |  |  |
Short-term deposits, classified as cash equivalents | [1] | $ 311,775 | $ 162,271
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure of Cash and cash equivalents [Line Items] |  |  |
Short-term deposits, classified as cash equivalents |  | 611,856 | 625,985
Citi bank [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure of Cash and cash equivalents [Line Items] |  |  |
Short-term deposits, classified as cash equivalents |  | 210,361 | 206,824
JP Morgan [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure of Cash and cash equivalents [Line Items] |  |  |
Short-term deposits, classified as cash equivalents |  | $ 401,495 | $ 419,161
[1] | 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.

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- Definition A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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