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Identification and business activity - Summary of unabsorbed cost due to production stoppage (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unabsorbed cost due to production stoppage
Unabsorbed cost due to production stoppage	$ 27,758	$ 0	$ 0
Depreciation and amortization incurred during the production stoppage	10,800
Services provided by third parties
Unabsorbed cost due to production stoppage
Unabsorbed cost due to production stoppage	13,885	0
Direct labor
Unabsorbed cost due to production stoppage
Unabsorbed cost due to production stoppage	11,057	0
Supplies
Unabsorbed cost due to production stoppage
Unabsorbed cost due to production stoppage	$ 2,816	$ 0

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- Definition

Represents the amount of depreciation and amortization incurred during the production stoppage.

+ References

No definition available.

+ Details

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Namespace Prefix:	bvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Represents the amount of unabsorbed cost due to production stoppage.

+ References

No definition available.

+ Details

Name:	bvn_UnabsorbedCostDueToProductionStoppage
Namespace Prefix:	bvn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	bvn_UnabsorbedCostDueToProductionStoppageAbstract
Namespace Prefix:	bvn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	bvn_ExpensesByNatureAxis=bvn_ServicesProvidedByThirdPartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	bvn_ExpensesByNatureAxis=bvn_DirectLaborMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	bvn_ExpensesByNatureAxis=bvn_MaterialsAndSuppliesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: