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Prepaid expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of Prepaid expenses [Abstract] |  |  |
Prepaid rentals | [1] | $ 28,349 | $ 29,235
Prepaid insurances |  | 12,401 | 6,055
Deferred costs of works for taxes |  | 2,013 | 1,801
Deferred royalties and rentals of mining concessions |  | 387 | 2,377
Other prepaid expenses |  | 1,956 | 2,355
Prepayments |  | 45,106 | 41,823
Classification by maturity: |  |  |
Current portion |  | 17,551 | 11,392
Non-current portion |  | 27,555 | 30,431
Prepayments |  | $ 45,106 | $ 41,823
[1] | This item corresponds to the balance of an original prepayment of US$31 million for the lease of hydraulic installations by the subsidiary Empresa de Generacion Huanza S.A. This prepayment is being charged to results during the life of the underlying assets (35 years) since January 2015.

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- Definition The amount of prepayments for deferred costs of works for taxes. + References No definition available. + Details
Name: | cik0001013131_DeferredCostsOfWorksForTaxes
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of prepayments for deferred royalties and rentals of mining concessions. + References No definition available. + Details
Name: | cik0001013131_DeferredRoyaltiesAndRentalsOfMiningConcessions
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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- Definition The amount of prepayments for other expenses. + References No definition available. + Details
Name: | cik0001013131_OtherPrepaidExpenses
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of prepayments for insurances. + References No definition available. + Details
Name: | cik0001013131_PrepaidInsurances
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | cik0001013131_TradeCurrentAndNoncurrentPortionAbstract
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount recognised as a current asset for expenditures made prior to the period when the economic benefit will be realised. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of non-current prepayments for leases. [Refer: Non-current prepayments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of non-current prepayments. [Refer: Prepayments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard -URIDate 2017-03-09 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Receivables that represent amounts paid for goods and services before they have been delivered. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | debit
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