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Hierarchy and fair value of financial instruments (Details Textuals) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Hierarchy and fair value of financial instruments [Line Items] |  |
Derivative financial asset liabilities | $ (20,113) | $ 68,736
Sociedad Minera Cerro Verde S.A.A. [Member] |  |
Hierarchy and fair value of financial instruments [Line Items] |  |
Derivative financial asset liabilities | $ 20,100 | $ 68,700

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- Definition The amount of derivative financial assets(liabilities) + References No definition available. + Details
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Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | cik0001013131_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=cik0001013131_SociedadMineraCerroVerdeSaaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |