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Financial - risk management objectives and policies - Effect in profit or loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financial - risk management objectives and policies |  |  |
Increase in exchange rate basis points | 10.00% | 10.00% | 10.00%
Decrease in exchange rate basis points | (10.00%) | (10.00%) | (10.00%)
Exchange rate increased effect on income | $ 9,282 | $ 4,053 | $ 1,695
Exchange rate decreased effect on income | $ (9,282) | $ (3,545) | $ (1,681)

X
- Definition The percentage of decrease in exchange rate basis points. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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X
- Definition The amount of decrease in income due to decrease the basis points in exchange rate. + References No definition available. + Details
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Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition The amount of increase in income due to Increase the basis points in exchange rate. + References No definition available. + Details
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Namespace Prefix: | bvn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition The percentage of increase in exchange rate basis points. + References No definition available. + Details
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Namespace Prefix: | bvn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant