XML 303 R278.htm IDEA: XBRL DOCUMENT
v3.21.1

Financial - risk management objectives and policies - Additional information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) $ / £ | Dec. 31, 2019 $ / £ | Dec. 31, 2018 $ / £
Disclosure Of Financial risk management [Line Items] |  |  |
Decrease in exchange rate basis points | 10.00% | 10.00% | 10.00%
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure Of Financial risk management [Line Items] |  |  |
Consolidated minimum net worth | $ | $ 2,711,389 |  |
Sociedad Minera Cerro Verde S.A.A. [Member] | Minimum |  |  |
Disclosure Of Financial risk management [Line Items] |  |  |
10% increase in copper price | 3.524 | 2.865 | 2.974
10% decrease in copper price | 2.884 | 2.344 | 2.433
Sociedad Minera Cerro Verde S.A.A. [Member] | Maximum |  |  |
Disclosure Of Financial risk management [Line Items] |  |  |
10% increase in copper price | 3.876 | 3.085 | 2.979
10% decrease in copper price | 3.172 | 2.524 | 2.437

X
- Definition The amount of consolidated minimum net worth, the group has to maintain as required under the debt covenants. + References No definition available. + Details
Name: | bvn_ConsolidatedMinimumNetWorthRequirement
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The exchange rate related to copper price decrease USD per pound. + References No definition available. + Details
Name: | bvn_DecreaseInCopperPriceRange
Namespace Prefix: | bvn_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of decrease in exchange rate basis points. + References No definition available. + Details
Name: | bvn_DecreaseInExchangeRateBasisPoints
Namespace Prefix: | bvn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The exchange rate related to copper price increase USD per pound. + References No definition available. + Details
Name: | bvn_IncreaseInCopperPriceRange
Namespace Prefix: | bvn_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |