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Derivative instruments - Impact of movements in market commodity prices (Details) oz in Millions, lb in Millions	Dec. 31, 2024 lb oz	Dec. 31, 2023 lb oz
Financial Instruments [Abstract]
Gold ounces | oz	0.8	0.0
Copper pounds | lb	0.4	0.0

X

- Definition

Financial Instruments [Abstract]

+ References

No definition available.

+ Details

Name:	ngd_FinancialInstrumentsAbstract
Namespace Prefix:	ngd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The volume of copper subject to final pricing net of outstanding swaps.

+ References

No definition available.

+ Details

Name:	ngd_VolumeOfCopperSubjectToFinalPricingNetOfOutstandingSwaps
Namespace Prefix:	ngd_
Data Type:	dtr-types1:massItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The volume of gold subject to final pricing net of outstanding swaps.

+ References

No definition available.

+ Details

Name:	ngd_VolumeOfGoldSubjectToFinalPricingNetOfOutstandingSwaps
Namespace Prefix:	ngd_
Data Type:	dtr-types1:massItemType
Balance Type:	na
Period Type:	instant