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LONG-TERM DEBT (Details 3) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Adjusted EBITDA to Interest [Member] |  |
Long Term Debt [Line Items] |  |
Interest Coverage Ratio | 4.7 : 1 | 5.7 : 1
Net Debt to Adjusted EBITDA [Member] |  |
Long Term Debt [Line Items] |  |
Leverage Ratio | 3.1 : 1 | 2.6 : 1
Applicable Financial Covenant [Member] | Adjusted EBITDA to Interest [Member] |  |
Long Term Debt [Line Items] |  |
Interest Coverage Ratio | >3.0 : 1 |
Applicable Financial Covenant [Member] | Net Debt to Adjusted EBITDA [Member] |  |
Long Term Debt [Line Items] |  |
Leverage Ratio | <4.0 : 1 |

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- Definition Ratio of interest coverage incurrence convenant of earnings before interest, taxes, depreciation, amortisation, impairment, and other non-cash adjustments to interest. + 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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- Definition Ratio of leverage coverage incurrence convenant of earnings before interest, taxes, depreciation, amortisation, impairment, and other non-cash adjustments to leverage. + References No definition available. + Details
Name: | ngd_LeverageRatio
Namespace Prefix: | ngd_
Data Type: | xbrli:stringItemType
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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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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_ApplicableFinancialCovenantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |