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v3.19.1

SHARE CAPITAL (Details 7) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Share capital [Line Items] |  |
Equity securities excluded from the calculation of diluted earnings per share | 0 | 0
Stock Options [Member] |  |
Share capital [Line Items] |  |
Equity securities excluded from the calculation of diluted earnings per share | 8.6 | 13.1

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- Definition The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 33 -IssueDate 2018-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2018-03-01&anchor=para_70_b&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ngd_AntidilutiveSecurityItemsAxis=ngd_StockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |