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v3.19.1

LONG-TERM DEBT (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
LONG-TERM DEBT |  |  |
Non-current portion of non-current borrowings |  | $ 780.5 | $ 1,007.7
Senior unsecured notes - due November 15, 2022 |  |  |
LONG-TERM DEBT |  |  |
Non-current portion of non-current borrowings | [1] | 495.3 | 494.3
Senior unsecured notes - due May15, 2025 |  |  |
LONG-TERM DEBT |  |  |
Non-current portion of non-current borrowings | [2] | 285.2 | 283.4
Credit Facility [member] |  |  |
LONG-TERM DEBT |  |  |
Non-current portion of non-current borrowings | [3] | $ 0.0 | $ 230.0
[1] | Senior Unsecured Notes – due November 15, 2022
[2] | Senior Unsecured Notes – due May 15, 2025
[3] | Credit Facility

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- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + 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: | ifrs-full_
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_BorrowingsByNameAxis=ngd_TwoThousandTwentyFiveUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ngd_RevolvingCreditFacility1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |