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DERIVATIVE INSTRUMENTS - Impact of movements in market commodity prices (Details) lb in Millions	Dec. 31, 2019 lb oz	Dec. 31, 2018 lb oz
Volumes subject to final pricing net of outstanding swaps
Gold ounces | oz	900.0	800.0
Copper pounds | lb	0.5	1.6

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	ngd_
Data Type:	num: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:	num:massItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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