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Share capital - Share-based payment expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Share capital [Line Items] |  |
Total share-based payment expenses | $ 8.5 | $ 3.8
Share-based payment expenses recognized in operating expenses | 3.1 | 1.2
Stock option expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 0.3 | 1.2
Performance share unit expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 1.5 | 0.5
Restricted share unit expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 5.0 | 2.1
Deferred share unit expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 1.6 | (0.4)
Shares issued under First Nations agreements |  |
Share capital [Line Items] |  |
Total share-based payment expenses | $ 0.1 | $ 0.4

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- Definition Amount of share based compensation expenses recognized in operating expenses. + References No definition available. + Details
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Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Share capital. + References No definition available. + Details
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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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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- Details
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Balance Type: |
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- Details
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