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Trade and other receivables, net - Movement of allowance for expected credit losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Available for Sale Assets Explanatory [Abstract] |  |  |  |  |
Beginning balance | $ 32,022 |  | $ 32,102 |  | $ 32,184
Provision for other receivable, note 26 | 4 |  | 25 |  | 1,334
Provision for trade receivables, note 24 | 126 |  | 0 |  | 18
Provision of the period | 130 |  | 25 |  | 1,352
Write off of the period |  |  | (162) |  | (410)
Exchange difference | (307) |  | 57 |  | (173)
Reversals of the period, note 26 |  |  | 0 |  | (45)
Other minor |  |  | 0 |  | (806)
Final balance | 31,845 |  | 32,022 |  | 32,102
Trade receivables | 22,128 | [1] | 22,016 | [1] | 22,013
Other receivables | $ 9,717 |  | $ 10,006 |  | $ 10,089
[1] | (f)Below is presented the movement in the allowance for expected credit losses:

X
- Definition Represents the valuation allowance for receivables due a company that are expected to be uncollectible. + References No definition available. + Details
Name: | bvn_AllowanceForDoubtfulAccounts
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of allowance of receivables classified as other receivables. + References No definition available. + Details
Name: | bvn_AllowanceForDoubtfulOtherReceivables
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of allowance of receivables classified as trade receivables. + References No definition available. + Details
Name: | bvn_AllowanceForDoubtfulTradeReceivables
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition It represents of Provision of other receivables + References No definition available. + Details
Name: | bvn_ProvisionForOtherReceivables
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition It represents of provision of trade receivables. + References No definition available. + Details
Name: | bvn_ProvisionForTradeReceivables
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the reversal of provision for doubtful accounts. + References No definition available. + Details
Name: | bvn_ReversalOfProvisionForDoubtfulAccounts
Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2020-01-01 + Details
Name: | ifrs-full_AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in the allowance account for credit losses of financial assets resulting from adjustments arising from the passage of time. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2020-01-01 + Details
Name: | ifrs-full_IncreaseDecreaseThroughAdjustmentsArisingFromPassageOfTimeAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in an allowance account for credit losses of financial assets resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2020-01-01 + Details
Name: | ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in allowance account for credit losses of financial assets resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2020-01-01 + Details
Name: | ifrs-full_IncreaseDecreaseThroughOtherChangesAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration