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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES - Reclamation provision (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES |  |
Balance, beginning of year | $ 1,411,293 |
Additions to reclamation provision | 1,327,278 | $ 1,411,293
Change in estimate | 2,687 |
Reclamation costs incurred | (1,456,227) |
Balance, end of year | $ 1,285,031 | $ 1,411,293

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- Definition The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Section D Examples: disclosures -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_D_TI -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 87 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_87&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCosts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | nfgc_AccountsPayablesAndAccruedLiabilitiesAbstract
Namespace Prefix: | nfgc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of additional provision related to restoration and rehabilitation activities. + References No definition available. + Details
Name: | nfgc_AdditionalProvisionRestorationAndRehabilitationActivities
Namespace Prefix: | nfgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of change in estimate, restoration and rehabilitation costs. + References No definition available. + Details
Name: | nfgc_ChangeInEstimateRestorationAndRehabilitationCosts
Namespace Prefix: | nfgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of reclamation costs, restoration and rehabilitation costs. + References No definition available. + Details
Name: | nfgc_ReclamationCostsRestorationAndRehabilitationCosts
Namespace Prefix: | nfgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration