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LONG-TERM DEBT (Details 2) - 2025 Unsecured Notes [member] | 12 Months Ended
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Dec. 31, 2017
Long Term Debt [Line Items] |
Borrowings Redemption Price Percentage | 100.00%
2020 |
Long Term Debt [Line Items] |
Borrowings Redemption Price Percentage | 104.78%
2021 |
Long Term Debt [Line Items] |
Borrowings Redemption Price Percentage | 103.19%
2022 |
Long Term Debt [Line Items] |
Borrowings Redemption Price Percentage | 101.59%
2023 and thereafter |
Long Term Debt [Line Items] |
Borrowings Redemption Price Percentage | 100.00%

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- Definition The percentage rate of the aggregate principle amount that determines the redemption price of borrowings. + References No definition available. + Details
Name: | ngd_BorrowingsRedemptionPricePercentage
Namespace Prefix: | ngd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ngd_UnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |