XML 84 R77.htm IDEA: XBRL DOCUMENT
v3.8.0.1

IMPAIRMENT (Details 2) (Parenthetical) - Individual assets or cash-generating units [member] | 12 Months Ended
--- | ---
Dec. 31, 2017 $ / Ounce-oz
Impairment [Line Items] |
Description of Changes in Gold Price | 100
Discount rate applied to cash flow projections | 0.50%
Description of Changes in Exchange Rate | 5.00%
Description of Changes in Operating Costs | 5.00%
Description of Changes in In-Situ Ounces | 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 2017-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_v&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections
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
Name: | ngd_DescriptionOfChangesInExchangeRate
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
Name: | ngd_DescriptionOfChangesInGoldPrice
Namespace Prefix: | ngd_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the in-situ ounces assumptions used to determine fair value. + References No definition available. + Details
Name: | ngd_DescriptionOfChangesInInsituOunces
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
Name: | ngd_DescriptionOfChangesInOperatingCosts
Namespace Prefix: | ngd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ngd_ImpairmentLineItems
Namespace Prefix: | ngd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_IndividualAssetsOrCashgeneratingUnitsAxis=ifrs-full_IndividualAssetsOrCashgeneratingUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |