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LONG-TERM DEBT - Redemption prices (Details) - Senior unsecured notes - due November 15, 2022	12 Months Ended
	Dec. 31, 2019
2019
Long Term Debt
Borrowings Redemption Price Percentage	101.04%
2020 and thereafter
Long Term Debt
Borrowings Redemption Price Percentage	100.00%

X

- Definition

The percentage rate of the aggregate principle amount that determines the redemption price of borrowings.

+ References

No definition available.

+ Details

Name:	ngd_BorrowingsRedemptionPricePercentage
Namespace Prefix:	ngd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Long Term Debt.

+ References

No definition available.

+ Details

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

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- Details

Name:	ngd_RedemptionPeriodAxis=ngd_RedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ngd_TwoThousandTwentyTwoUnsecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ngd_RedemptionPeriodAxis=ngd_RedemptionPeriodThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: