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Share capital - Share-based payment expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Share capital [Line Items] |  |
Total share-based payment expenses | $ 3.8 | $ 3.3
Share-based payment expenses recognized in operating expenses | 1.2 | 1.1
Stock option expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 1.2 | 1.1
Performance share unit expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 0.5 | 1.6
Restricted share unit expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | 2.1 | 1.4
Deferred share unit expense |  |
Share capital [Line Items] |  |
Total share-based payment expenses | (0.4) | (0.7)
Shares issued under First Nations agreements |  |
Share capital [Line Items] |  |
Total share-based payment expenses | $ 0.4 | $ (0.1)

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- Definition Amount of share based compensation expenses recognized in operating expenses. + References No definition available. + Details
Name: | ngd_ShareBasedCompensationExpenseRecognizedInOperatingExpenses
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
Name: | ngd_ShareCapitalLineItems
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
Period Type: | duration

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- Details
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Data Type: | na
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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ngd_PerformanceShareUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ngd_RestrictedShareUnitMember
Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ngd_CommonSharesUnderFirstNationsAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |