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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
	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