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Financial Income (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2013 USD ($)
Financial Income [Abstract]
Interest Related To Special Mining Burden For October Two Thousand Twelve Through Two December Thousand Thirteen	$ 18.6

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- References

No definition available.

+ Details

Name:	cik0001013131_FinancialIncomeAbstract
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

"The amount of interest Related to Income on Special Mining Burden for October 2012 through December 2013.

+ References

No definition available.

+ Details

Name:	cik0001013131_InterestRelatedToSpecialMiningBurdenForOctoberTwoThousandTwelveThroughTwoDecemberThousandThirteen
Namespace Prefix:	cik0001013131_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration