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v3.20.1

SHARE CAPITAL - Share-based payment expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Share capital |  |
Share-based payment expenses | $ 2.7 | $ 0.7
Stock Options [Member] |  |
Share capital |  |
Share-based payment expenses | 0.5 | 1.4
Performance Share Units [Member] |  |
Share capital |  |
Share-based payment expenses | 0.3 | 0.1
Restricted Share Unit [Member] |  |
Share capital |  |
Share-based payment expenses | 1.1 | (0.3)
Deferred share units [Member] |  |
Share capital |  |
Share-based payment expenses | 0.8 | (0.8)
Common Shares Under First Nations Agreement [Member] |  |
Share capital |  |
Share-based payment expenses | $ 0.0 | $ 0.3

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

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- Definition The amount of share-based payment including operating expenses. + References No definition available. + Details
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Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Data Type: | na
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- Details
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Data Type: | na
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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Data Type: | na
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