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v3.19.1

Other accounts payable (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2008 | Dec. 31, 2007 | Dec. 31, 2006
Disclosure of other accounts payable [Abstract] |  |  |  |  |  |
Mining royalties | $ 21,526 | $ 31,217 | $ 27,611 | $ 13,200 | $ 13,200 | $ 13,200
Interest and penalties | 23,800 |  |  | $ 18,900 | $ 18,900 | $ 18,900
Deferred Interest And Penalties | 41,400 |  |  |  |  |
Mining Royalties Non Current | 85,500 |  |  |  |  |
Interest And Penalties Non Current | $ 129,600 |  |  |  |  |

X
- Definition Amount of Deferred Interest And Penalties. + References No definition available. + Details
Name: | cik0001013131_DeferredInterestAndPenalties
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | cik0001013131_DisclosureOfOtherAccountsPayableAbstract
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of interest and penalties which included in other accounts payable. + References No definition available. + Details
Name: | cik0001013131_InterestAndPenalties
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents noncurrent portion of interest penalities. + References No definition available. + Details
Name: | cik0001013131_InterestAndPenaltiesNonCurrent
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Royalty expense incurred and are directly related to goods produced and sold and services rendered during the reporting period. + References No definition available. + Details
Name: | cik0001013131_MiningRoyalties
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents noncurrent portion of mining royalities + References No definition available. + Details
Name: | cik0001013131_MiningroyaltiesNonCurrent
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant