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Financial risk management - Credit risk (Details) - CREDIT RISK EXPOSURE - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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CREDIT RISK EXPOSURE |  |
Maximum exposure to credit risk | $ 201.8 | $ 214.9
Cash and cash equivalents |  |
CREDIT RISK EXPOSURE |  |
Maximum exposure to credit risk | 185.5 | 200.8
Trade and other receivables |  |
CREDIT RISK EXPOSURE |  |
Maximum exposure to credit risk | $ 16.3 | $ 14.1

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35K -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition no definition available + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CreditRiskMember
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Data Type: | na
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Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ngd_CashAndCashEquivalentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |