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Embedded derivatives (Details Textual) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Embedded derivatives [Abstract]
Trade account receivable due from related parties	$ 19.3	$ 65.6
Trade accounts receivable net	$ 0.8	$ 3.1

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- References

No definition available.

+ Details

Name:	cik0001013131_DisclosureOfEmbeddedDerivativesAbstract
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Trade account receivable due from related parties.

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No definition available.

+ Details

Name:	cik0001013131_TradeAccountReceivableDueFromRelatedParties
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Trade accounts receivable (net).

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No definition available.

+ Details

Name:	cik0001013131_TradeAccountsReceivablenet
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant