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IMPAIRMENT (Details 3) (Parenthetical) - Individual assets or cash-generating units [member]	12 Months Ended
	Dec. 31, 2018 $ / Ounce-oz
Impairment [Line Items]
Description of changes in gold price	100
Description of change in discount rate	0.50%
Description of change in foreign exchange rate	5.00%
Description of change in operating costs	5.00%
Description of change in in-situ ounces or in-situ value	5.00%

X

- Definition

The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2018-01-01
-Paragraph 134
-Subparagraph d
-Clause v
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_d_v&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2018-01-01
-Paragraph 134
-Subparagraph e
-Clause v
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_e_v&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the exchange rate assumptions used to determine fair value.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the gold price assumptions used to determine fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	ngd_
Data Type:	us-types:perUnitItemType
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Period Type:	duration

X

- Definition

Represents the in-situ ounces assumptions used to determine fair value.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the operating costs assumptions used to determine fair value.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: