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Identification and business activity - Summary of unabsorbed cost due to production stoppage (Details) - USD ($) $ in Thousands | 12 Months Ended
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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: |