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Financial expenses - Additional inforamtion (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2010
Finance Expense [Line Items] |  |  |  |  |  |
Interest related to the installment payment programs for SMT and disputed mining royalties | $ 38.2 | $ 53.6 |  |  |  |
Interest related to the ITAN |  |  |  | $ 10.4 | $ 10.4 | $ 10.4
Interest of other taxes related to disputed mining royalty | 5.6 | 2.9 |  |  |  |
Interest associated with disputed mining royalties |  | $ 1.2 |  |  |  |
Interest and interest on penalties associated to disputed mining royalties |  |  | $ 218.7 |  |  |
Interest on income tax related to disputed mining royalties |  |  | 75.7 |  |  |
Interest related to the SMT |  |  | 51.0 |  |  |
Interest paid on royalty installment payment program |  |  | 6.1 |  |  |
Deferral interest related to the new royalty installment payment programs |  |  | 5.3 |  |  |
Interest of amended tax return |  |  | 1.3 |  |  |
Interest on royalties, interest paid on the royalty installment payment program and interest on royalty penalties |  |  | $ 12.1 |  |  |
Interests related to income tax assessment for the year 2013 | 31.4 |  |  |  |  |
Interests related to uncertain income tax treatments (IFRIC 23) associated primarily to tailing dam income tax | 13.1 |  |  |  |  |
Interests related to SUNAT assessments | $ 8.7 |  |  |  |  |

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- Definition The amount of deferral interest related to the new royalty installment payment programs. + References No definition available. + Details
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- Definition The amount of interest and interest on penalties associated to disputed mining royalties. + References No definition available. + Details
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- Definition The amount of interest of amended tax return. + References No definition available. + Details
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- Definition The amount of interest of other taxes related to disputed mining royalty. + References No definition available. + Details
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- Definition The amount of interest on income tax related to disputed mining royalties. + References No definition available. + Details
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- Definition The amount of interest on royalties, interest paid on the royalty installment payment program and interest on royalty penalties. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The amount of interest paid on royalty installment payment program. + References No definition available. + Details
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Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of interest associated with disputed mining royalties. + References No definition available. + Details
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Balance Type: | debit
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- Definition The amount of interest related to income tax assessments. + References No definition available. + Details
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- Definition The amount of interest related to the installment payment programs for SMT and disputed mining royalties. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The amount of interest related to the ITAN. + References No definition available. + Details
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Namespace Prefix: | bvn_
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- Definition The amount of interest related to the SMT. + References No definition available. + Details
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- Definition The amount of interest related to SUNAT assessments. + References No definition available. + Details
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Balance Type: | debit
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- Definition The amount of interest related to uncertain income tax treatments (IFRIC 23) associated primarily to tailing dam income tax. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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