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MINING INTERESTS - Additional information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Gross carrying amount [member]
Mining Interests
Refundable tax credits received	$ 2.0

X

- Definition

It represents the amounts transferred out of construction in progress to inventories upon reaching commercial production.

+ References

No definition available.

+ Details

Name:	ngd_IncreaseDecreaseThroughTransfersFromConstructionInProgressInventories
Namespace Prefix:	ngd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: