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Cash and cash equivalents (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Cash and cash equivalents |  |  |  |  |
Cash |  | $ 173 | $ 304 |  |
Bank accounts (b) | [1] | 185,276 | 37,836 |  |
Time deposits (c) | [2] | 50,000 | 171,906 |  |
Cash and cash equivalents. |  | 235,449 | 210,046 | $ 369,200 | $ 214,551
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Cash and cash equivalents |  |  |  |  |
Cash |  | 22 | 22 |  |
Bank accounts (b) |  | 51,279 | 56,822 |  |
Time deposits (c) |  | 819,628 | 761,659 |  |
Cash and cash equivalents. |  | 870,929 | 818,503 |  |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |  |
Cash and cash equivalents |  |  |  |  |
Cash equivalents | [3] | 529,820 | 471,372 |  |
Bank accounts (b) |  | 3,910 | 10,119 |  |
Cash and cash equivalents. |  | $ 533,730 | $ 481,491 |  |
[1] | (b)Bank accounts earn interest at floating rates based on market rates.
[2] | (c)As of December 31, 2020 and 2019, time deposits were kept in prime financial institutions, which generated interest at annual market rates and have current maturities, according to the immediate cash needs of the Group.
[3] | (a)Cash equivalents as of December&#160;31, 2020, includes short-term deposits with Scotiabank Peru of US$125.0 million, Citibank NY of US$92.3 million and a portfolio of investments in highly marketable liquid investments (investments classified as &#8220;AAA&#8221; by Standard&#160;& Poor&#8217;s and Moody&#8217;s) of US$312.5 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&#160;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 balances held at banks. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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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 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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