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Financial Income (Details Textual) $ in Millions | 12 Months Ended
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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
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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 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