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Provisions and contingent liabilities - Movement of the provision for social responsibility (Details) - Minera Yanacocha SRL and subsidiary [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Provisions and contingent liabilities |  |  |
Opening balance | $ 18,326 | $ 18,010 | $ 21,689
Additional provisions |  | 888 |
Payments | (6) | (572) | (3,679)
Corrections | (1,711) |  |
Ending balance | 16,609 | 18,326 | 18,010
Classification by maturity [Abstract] |  |  |
Current portion | 1,728 | 761 | 8,351
Non-current portion | 14,881 | 17,565 | 9,659
Ending balance | $ 16,609 | $ 18,326 | $ 18,010

X
- Definition Amount of additional provision recognised during the period. + References No definition available. + Details
Name: | bvn_AdditionalProvisionToProvisionDuringYear
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | bvn_ClassificationByMaturityAbstract
Namespace Prefix: | bvn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in provisions for social responsibility due to corrections. + References No definition available. + Details
Name: | bvn_CorrectionsToProvisionForSocialResponsibility
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of provision for social responsibility classified as current. + References No definition available. + Details
Name: | bvn_CurrentPortionProvisionForSocialResponsibility
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Provisions and contingent liabilities + References No definition available. + Details
Name: | bvn_DisclosureOfProvisionsLineItems
Namespace Prefix: | bvn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of provision for social responsibility classified as Non-Current. + References No definition available. + Details
Name: | bvn_NonCurrentPortionProvisionForSocialResponsibility
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount paid for social responsibility out of Provisions made. + References No definition available. + Details
Name: | bvn_PaymentsTowardsSocialResponsibility
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of provision for social responsibility. + References No definition available. + Details
Name: | bvn_ProvisionForSocialResponsibility
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=bvn_MineraYanacochaSrlAndSubsidiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |