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v3.22.4

Long-term debt - Borrowings redemption prices (Details) - Senior unsecured notes - due July 15, 2027 | 12 Months Ended
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Dec. 31, 2022
Long Term Debt [Line Items] |
Borrowings redemption price percentage | 100.00%
2023 |
Long Term Debt [Line Items] |
Borrowings redemption price percentage | 103.75%
2024 |
Long Term Debt [Line Items] |
Borrowings redemption price percentage | 101.88%
2025 and thereafter |
Long Term Debt [Line Items] |
Borrowings redemption price percentage | 100.00%

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- Definition The percentage rate of the aggregate principle amount that determines the redemption price of borrowings. + References No definition available. + Details
Name: | ngd_BorrowingsRedemptionPricePercentage
Namespace Prefix: | ngd_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Long Term Debt. + References No definition available. + Details
Name: | ngd_LongTermDebtLineItems
Namespace Prefix: | ngd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ngd_TwoThousandTwentySevenUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |