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Derivative instruments - Impact of movements in market commodity prices (Details) oz in Millions, lb in Millions | Dec. 31, 2021 lb oz | Dec. 31, 2020 oz lb
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Volumes subject to final pricing net of outstanding swaps |  |
Gold ounces | oz | 0.7 | 1.2
Copper pounds | lb | 1.0 | 1.6

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- Definition The volume of copper subject to final pricing net of outstanding swaps. + References No definition available. + Details
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Namespace Prefix: | ngd_
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Balance Type: | na
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- Definition The volume of gold subject to final pricing net of outstanding swaps. + References No definition available. + Details
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Namespace Prefix: | ngd_
Data Type: | num:massItemType
Balance Type: | na
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