XML 126 R119.htm IDEA: XBRL DOCUMENT v3.8.0.1

SEGMENTED INFORMATION (Details Textual) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017	Dec. 31, 2016
Gains on Disposal of El Morro Stream	$ 33.0	$ 33.0	$ 0.0
Major Customer [Member]
Percentage of entity's revenue		79.00%	71.00%

X

- Definition

The percentage of the entity's revenue. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 8
-IssueDate 2017-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_34&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_PercentageOfEntitysRevenue
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The gain on the disposal of El Morro stream.

+ References

No definition available.

+ Details

Name:	ngd_GainsOnDisposalOfElMorroStream
Namespace Prefix:	ngd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ngd_MajorCustomerAxis=ngd_MajorCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: