XML 150 R104.htm IDEA: XBRL DOCUMENT
v3.22.4

Financial risk management - Metal and input price risk (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Gold price |  |
Financial risk management [Line Items] |  |
Impact on net earnings due to 10 % change in price | $ 48.6 | $ 49.9
Copper price |  |
Financial risk management [Line Items] |  |
Impact on net earnings due to 10 % change in price | 11.9 | 24.7
Fuel and electricity price |  |
Financial risk management [Line Items] |  |
Impact on net earnings due to 10 % change in price | $ 7.5 | $ 5.7

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ngd_FinancialRiskManagementLineItems
Namespace Prefix: | ngd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition it represents the total impact on net earnings due to 10 percent change in price. + References No definition available. + Details
Name: | ngd_ImpactOnNetEarningsDueTo10PercentChangeInPrice
Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ngd_Gold1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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