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Derivative instruments - Additional information (Details) $ in Millions | 1 Months Ended |
--- | --- | ---
Jan. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($)
Disclosure of derivative instruments |  |  |
Strike price of put options at the time of purchasing | $ 3.10 |  |
Foreign exchange forward contracts |  |  |
Disclosure of derivative instruments |  |  |
Amount hedged per month |  |  | $ 42.0
Average foreign exchange rate |  | $ 1,500,000 |

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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_HedgingInstrumentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount hedged per month by the derivative instrument. + References No definition available. + Details
Name: | ngd_AmountHedgedPerMonth
Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of derivative instruments. + References No definition available. + Details
Name: | ngd_DisclosureOfDerivativeInstrumentsLineItems
Namespace Prefix: | ngd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The strike price of put options at the time of purchasing a gold price option contracts. + References No definition available. + Details
Name: | ngd_StrikePriceOfPutOptionsAtTheTimeOfPurchasing
Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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