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MINING INTERESTS - Additional information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Gross carrying amount [member] |
Mining Interests |
Refundable tax credits received | $ 2.0

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- Definition It represents the amounts transferred out of construction in progress to inventories upon reaching commercial production. + References No definition available. + Details
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Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |