XML 134 R109.htm IDEA: XBRL DOCUMENT v3.21.1

Basis for preparation, consolidation and accounting policies - Additional information (Details)		12 Months Ended
	Jan. 01, 2017	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)
Basis for preparation, consolidation and accounting policies
Useful lives or depreciation of Investment property		20 years
Impairment loss					$ 0
Workers' profit sharing rate		8.00%
Qualifying asset, description		The Group defines a qualifying asset as one which value is greater than US$5 million and requires a longer period to 12 months to get ready for its intended use.
Applicable tax rate	29.50%	32.00%	32.00%	32.00%
Lease Liabilities		$ 7,839,000	$ 7,503,000
Right-of-use assets		$ 7,178,000	$ 6,185,000
Lease term		10 years
Maximum [Member]
Basis for preparation, consolidation and accounting policies
Normal credit term		90 days
Mining Royalties Marginal Rate		12.00%
Useful life of intangible assets		10 years
Minimum [Member]
Basis for preparation, consolidation and accounting policies
Normal credit term		30 days
Mining Royalties Marginal Rate		1.00%
Useful life of intangible assets		1 year
Written put options [member]
Basis for preparation, consolidation and accounting policies
Closing foreign exchange rate		0.2759	0.2959
Purchased call options [member]
Basis for preparation, consolidation and accounting policies
Closing foreign exchange rate		0.2764	0.2968
Minera Yanacocha SRL and subsidiary [Member]
Basis for preparation, consolidation and accounting policies
Applicable tax rate	29.50%	29.50%	29.50%	29.50%
Lease Liabilities		$ 330,000	$ 596,000
Interest from short-term money market funds and interest from current bank accounts		$ 8,100,000	18,430,000	$ 11,448,000
Terminal compensation percentage		1.50%
Maximum severance payments | item		12
Amortization expense of intangible assets		$ 3,000,000	$ 3,000,000	$ 4,100,000
Minera Yanacocha SRL and subsidiary [Member] | Maximum [Member]
Basis for preparation, consolidation and accounting policies
Mining Royalties Marginal Rate		12.00%
Minera Yanacocha SRL and subsidiary [Member] | Minimum [Member]
Basis for preparation, consolidation and accounting policies
Mining Royalties Marginal Rate		1.00%
Sociedad Minera Cerro Verde S.A.A. [Member]
Basis for preparation, consolidation and accounting policies
Workers' profit sharing rate		8.00%
Applicable tax rate		32.00%	32.00%	32.00%
Right-of-use assets		$ 76,862,000	$ 84,856,000	$ 95,728,000
Amortization expense of intangible assets		$ 1,000,000	$ 1,000,000
Sociedad Minera Cerro Verde S.A.A. [Member] | Concessions related to the operation of the port terminal
Basis for preparation, consolidation and accounting policies
Useful life of intangible assets		20 years
Sociedad Minera Cerro Verde S.A.A. [Member] | Written put options [member]
Basis for preparation, consolidation and accounting policies
Closing foreign exchange rate		3.624	3.317
Sociedad Minera Cerro Verde S.A.A. [Member] | Purchased call options [member]
Basis for preparation, consolidation and accounting policies
Closing foreign exchange rate		3.618	3.311
Plant and equipment [Member] | Minera Yanacocha SRL and subsidiary [Member] | Maximum [Member]
Basis for preparation, consolidation and accounting policies
Lease term		10 years
Plant and equipment [Member] | Minera Yanacocha SRL and subsidiary [Member] | Minimum [Member]
Basis for preparation, consolidation and accounting policies
Lease term		3 years
Buildings and other constructions
Basis for preparation, consolidation and accounting policies
Lease Liabilities		$ 3,971,000	$ 5,296,000
Right-of-use assets		$ 3,370,000	$ 4,602,000
Buildings and other constructions | Minera Yanacocha SRL and subsidiary [Member] | Maximum [Member]
Basis for preparation, consolidation and accounting policies
Lease term		10 years
Buildings and other constructions | Minera Yanacocha SRL and subsidiary [Member] | Minimum [Member]
Basis for preparation, consolidation and accounting policies
Lease term		5 years
OSINERGMIN [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]
Basis for preparation, consolidation and accounting policies
Contribution rate on sales invoice value		0.14%	0.13%	0.14%
OEFA [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]
Basis for preparation, consolidation and accounting policies
Contribution rate on sales invoice value		0.10%	0.11%

X

- Definition

The percentage of contribution made on sale invoice value.

+ References

No definition available.

+ Details

Name:	bvn_ContributionRateOnSalesInvoiceValue
Namespace Prefix:	bvn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents information pertaining to normal credit term offered to customers.

+ References

No definition available.

+ Details

Name:	bvn_CustomerCreditTerm
Namespace Prefix:	bvn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Basis for preparation, consolidation and accounting policies

+ References

No definition available.

+ Details

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

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	bvn_IfrsLesseeOperatingLeaseTermOfContract
Namespace Prefix:	bvn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum number of severance payments paid per employee.

+ References

No definition available.

+ Details

Name:	bvn_MaximumSeverancePayments
Namespace Prefix:	bvn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents information pertaining to marginal rate for calculating mining royalties.

+ References

No definition available.

+ Details

Name:	bvn_MiningRoyaltiesMarginalRate
Namespace Prefix:	bvn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The description of qualifying asset.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of terminal compensation is provided to employees based on the base salary up on termination with out cause.

+ References

No definition available.

+ Details

Name:	bvn_TerminationCompensationWithOutCausePercentageOnBaseSalary
Namespace Prefix:	bvn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The useful life, measured as period of time, used for Investment property.

+ References

No definition available.

+ Details

Name:	bvn_UsefulLifeMeasuredAsPeriodOfTimePropertyInvestmentProperty
Namespace Prefix:	bvn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The rate of workers' profit sharing.

+ References

No definition available.

+ Details

Name:	bvn_WorkersProfitSharingRate
Namespace Prefix:	bvn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2020-01-01
-Paragraph 118
-Subparagraph e
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_vi&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_ApplicableTaxRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_ClosingForeignExchangeRate
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2020-01-01
-Paragraph 130
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_130_b&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2020-01-01
-Paragraph 130
-Subparagraph d
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_130_d_ii&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_ImpairmentLoss
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of revenue arising from interest for financial assets that are measured at amortised cost. [Refer: Interest income; Financial assets at amortised cost]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 20
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_20_b&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_InterestIncomeForFinancialAssetsMeasuredAtAmortisedCost
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_LeaseLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph j
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_RightofuseAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2020-01-01
-Paragraph 118
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_a&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfInstrumentAxis=ifrs-full_WrittenPutOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfInstrumentAxis=ifrs-full_PurchasedCallOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=bvn_ConcessionsRelatedToOperationOfPortTerminalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=bvn_PlantAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=ifrs-full_BuildingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CounterpartiesAxis=bvn_OsinergminMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CounterpartiesAxis=bvn_OefaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: