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v3.20.1

SEGMENTED INFORMATION - Additional information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
SEGMENTED INFORMATION |  |
Severance and Other Termination Benefits | $ 1.1 | $ 4.1
Major Customer [Member] |  |
SEGMENTED INFORMATION |  |
Percentage of entity's revenue | 89.00% | 79.00%

X
- Definition The percentage of the entity's revenue. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_34&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_PercentageOfEntitysRevenue
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The disclosure of detailed information about reportable operating segments. + References No definition available. + Details
Name: | ngd_SegmentedInformationLineItems
Namespace Prefix: | ngd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount represents the value of severance and other termination benefits. + References No definition available. + Details
Name: | ngd_SeveranceAndOtherTerminationBenefits
Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_MajorCustomersAxis=ngd_MajorCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |