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Trade and other payables (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Trade and other payables [Abstract] |  |  |
Beginning balance | $ 730 | $ 1,018 | $ 1,044
Declared dividends to controlling shareholders, note 17(d) | 22,860 | 22,099 | 7,621
Dividends paid to controlling shareholders | (22,860) | (22,099) | (7,621)
Declared dividends to non-controlling shareholders | 5,560 | 6,036 | 7,400
Dividends paid to non-controlling shareholders | (5,560) | (6,036) | (7,400)
Expired dividends | (44) | (327) | (30)
Other minor | (23) | 39 | 4
Final balance | $ 663 | $ 730 | $ 1,018

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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 dividends declared to noncontrolling shareholders. + References No definition available. + Details
Name: | cik0001013131_DividendDeclaredToNoncontrollingShareholders
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of dividend declared to controlling shareholders. + References No definition available. + Details
Name: | cik0001013131_DividendsDeclaredToOwners
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of dividends paid to controlling shareholder. + References No definition available. + Details
Name: | cik0001013131_DividendsPaidToOwners
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The element represents the amount of expired dividends. + References No definition available. + Details
Name: | cik0001013131_ExpiredDividend
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The element represents the amount of other minor adjustments pertaining to dividends. + References No definition available. + Details
Name: | cik0001013131_OtherMinor
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of dividends that the company has declared but not yet paid. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DividendPayables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of dividends paid to non-controlling interests. [Refer: Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B10 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B10_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | duration