XML 117 R86.htm IDEA: XBRL DOCUMENT
v3.19.1

DERIVATIVE INSTRUMENTS (Details 5) - Copper [Member] | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) oz Tonnes
Derivative instruments [Line Items] |  |
Copper Call Contracts Sold Quantity Outstanding | Tonnes | 21,600 |
Copper Call Contracts Purchased Quantity Outstanding | Tonnes | 21,600 |
Copper Call Contracts Sold Remaining Contractual term | 2019 years |
Copper Call Contracts Purchased Remaining Contractual term | 2019 years |
Copper Call Contracts Sold Exercise Price | oz | 3.00 |
Copper Put Contracts Purchased Exercise Price | oz | 2.50 |
Copper Call Contracts Sold Fair Value Assets | $ | $ (2.3) | [1]
Copper Put Contracts Purchased Fair Value Liability | $ | $ 3.0 | [1]
[1] | The Company presents the fair value of its put and call options on a net basis on the consolidated statements of financial position. The Company has a legally enforceable right to set off the amounts under its option contracts and intends to settle on a net basis.

X
- Definition Copper contracts Purchased, Quantity Outstanding + References No definition available. + Details
Name: | ngd_CopperCallContractsPurchasedQuantityOutstanding
Namespace Prefix: | ngd_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Copper contracts Purchased, Remaining Term + References No definition available. + Details
Name: | ngd_CopperCallContractsPurchasedRemainingContractualTerm
Namespace Prefix: | ngd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Copper contracts Sold, Quantity Exercise Price + References No definition available. + Details
Name: | ngd_CopperCallContractsSoldExercisePrice
Namespace Prefix: | ngd_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Copper contracts Sold, Fair Value Assets. + References No definition available. + Details
Name: | ngd_CopperCallContractsSoldFairValueAssets
Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Copper contracts Sold, Quantity Outstanding + References No definition available. + Details
Name: | ngd_CopperCallContractsSoldQuantityOutstanding
Namespace Prefix: | ngd_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Copper contracts Sold, Quantity Remaining Term + References No definition available. + Details
Name: | ngd_CopperCallContractsSoldRemainingContractualTerm
Namespace Prefix: | ngd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Copper contracts Purchased, Exercise Price + References No definition available. + Details
Name: | ngd_CopperPutContractsPurchasedExercisePrice
Namespace Prefix: | ngd_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Copper contracts Purchased, Fair Value Liabilities. + References No definition available. + Details
Name: | ngd_CopperPutContractsPurchasedFairValueLiability
Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ngd_CopperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |