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Cash and cash equivalents - Term deposit balance (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents | [1] | $ 50,000 | $ 171,906
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | 819,628 | 761,659
Moodys [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | 312,500 |
Scotiabank Peru [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | 125,000 |
Scotiabank Peru [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | 125,000 |
Citibank NY [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | 92,300 |
JP Morgan [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | 404,319 | 501,916
Citi bank [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | 215,073 | 214,282
Santander [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | 50,114 |
BNP Paribas [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | 50,080 | $ 45,461
Standard Chartered [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | 50,031 |
MUFG Bank [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |
Cash and cash equivalents |  |  |
Short-term deposits, classified as cash equivalents |  | $ 50,011 |
[1] | (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.

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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 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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