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Derivative instruments (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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DERIVATIVE LIABILITIES |  |
Total derivative assets (liabilities) | $ 0.9 | $ (0.9)
Foreign exchange forward contracts |  |
DERIVATIVE LIABILITIES |  |
Total derivative assets (liabilities) | 1.5 | 0.0
Unsettled provisionally priced concentrate derivatives, and swap contracts |  |
DERIVATIVE LIABILITIES |  |
Total derivative assets (liabilities) | $ (0.6) | $ (0.9)

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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ngd_ConcentrateDerivativesAndSwapContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |