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DERIVATIVE INSTRUMENTS (Details 4) lb in Millions	Dec. 31, 2018 oz lb	Dec. 31, 2017 oz lb
Volumes subject to final pricing net of outstanding swaps [Abstract]
Gold ounces | oz	800	2,000
Copper pounds | lb	1.6	1.6

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:	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