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Share capital - Share-based payment expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Share capital [Line Items] |  |
Total share-based payment expenses | $ 21.3 | $ 8.5
Share-based payment expenses recognized in operating expenses | (7.6) | (3.1)
Share-based payment expenses | 13.7 | 5.4
Stock option expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 0.1 | 0.3
Performance share unit expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 3.2 | 1.5
Restricted share unit expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 12.3 | 5.0
Deferred share unit expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 5.5 | 1.6
Shares issued under First Nations agreements |  |
Share capital [Line Items] |  |
Total share-based payment expenses | $ 0.2 | $ 0.1

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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 Based Payment Expense + References No definition available. + Details
Name: | ngd_ShareBasedPaymentExpense
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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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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |