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LONG-TERM DEBT (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
LONG-TERM DEBT
Total long-term debt	$ 714.5	$ 780.5
Senior unsecured notes - due November 15, 2022
LONG-TERM DEBT
Total long-term debt	397.4	495.3
Senior unsecured notes - due May 15, 2025
LONG-TERM DEBT
Total long-term debt	287.1	285.2
Credit Facility [Member]
LONG-TERM DEBT
Total long-term debt	$ 30.0	$ 0.0

X

- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_LongtermBorrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_NoncurrentPortionOfNoncurrentBorrowingsByTypeAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ngd_RevolvingCreditFacility1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: