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Cash and cash equivalents (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of Cash and cash equivalents [Line Items] |  |  |  |  |  |
Cash |  | $ 347 | $ 327 |  |  |
Bank accounts | [1] | 57,078 | 51,953 | [2] |  |
Time deposits | [2] | 311,775 | 162,271 |  |  |
Cash and cash equivalents |  | 369,200 | 214,551 |  | $ 80,544 | $ 78,519
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |  |
Disclosure of Cash and cash equivalents [Line Items] |  |  |  |  |  |
Cash |  | 33 | 34 |  |  |
Bank accounts |  | 111,319 | 48,995 |  |  |
Time deposits |  | 611,856 | 625,985 |  |  |
Cash and cash equivalents |  | 723,208 | 675,014 |  |  |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |  |  |
Disclosure of Cash and cash equivalents [Line Items] |  |  |  |  |  |
Bank accounts |  | 3,679 | 3,500 |  |  |
Cash equivalents (a) | [3] | 497,503 | 596,527 |  |  |
Cash and cash equivalents |  | $ 501,182 | $ 600,027 |  |  |
[1] | Bank accounts earn interest at floating rates based on market rates.
[2] | 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.
[3] | 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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- 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 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard -URIDate 2018-03-16 + Details
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