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Financial - risk management objectives and policies - Effect in profit or loss of the variations of interest rates (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financial - risk management objectives and policies |  |  |
Increase in libor interest rate | 10.00% | 10.00% | 10.00%
Decrease in libor interest rate | (10.00%) | (10.00%) | (10.00%)
Libor interest rate increased effect on income | $ (81) | $ (306) | $ (277)
Libor interest rate decreased effect on income | $ 81 | $ 306 | $ 277

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

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

X
- Definition The percentage of increase in libor interest rate. + References No definition available. + Details
Name: | bvn_IncreaseInLiborInterestRate
Namespace Prefix: | bvn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of decrease in income due to decrease the libor interest rate. + References No definition available. + Details
Name: | bvn_LiborInterestRateDecreasedEffectOnIncome
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of increase in income due to Increase the libor interest rate. + References No definition available. + Details
Name: | bvn_LiborInterestRateIncreasedEffectOnIncome
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration