XML 49 R42.htm IDEA: XBRL DOCUMENT
v3.8.0.1

MINING INTERESTS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [abstract] |
Disclosure of detailed information about property, plant and equipment [text block] |
| Mining Properties |  |  |  |
| Dep letable | Non- deple table | Plant & equip ment | Construction in progress | Explor ation & eval uation | To tal
(in millions of U.S. dollars) |  |  |  |  |  |
Cost |  |  |  |  |  |
As at December 31, 2015 | 1,459.5 | 1,020.9 | 875.8 | 325.5 | 7.5 | 3,689.2
Additions | 57.0 | 90.2 | 32.6 | 509.9 | - | 689.7
Disposals | - | - | (13.6) | - | - | (13.6)
Transfers | 23.7 | 6.0 | 64.3 | (94.0) | - | -
Impairments | - | - | - | - | (6.4) | (6.4)
As at December 31, 2016 | 1,540.2 | 1,117.1 | 959.1 | 741.4 | 1.1 | 4,358.9
Additions | 88.8 | 65.8 | 44.5 | 529.7 | - | 728.8
Disposal of El Morro stream | - | (32.0) | - | - | - | (32.0)
Disposals | - | - | (17.0) | - | - | (17.0)
Impairment loss on held-for-sale assets(2) | (48.6) | - | - | - | - | (48.6)
Assets reclassified as held-for-sale(2) | (178.5) | (9.8) | (161.4) | (0.3) | - | (350.0)
Transfers(3) | 1,219.5 | (580.2) | 554.1 | (1,213.8) | - | (20.4)
Impairments(4) | (268.4) | - | - | - | - | (268.4)
As at December 31, 2017 | 2,353.0 | 560.9 | 1,379.3 | 57.0 | 1.1 | 4,351.3
Accumulated depreciation |  |  |  |  |  |
As at December 31, 2015 | 541.8 | - | 344.2 | - | - | 886.0
Depreciation for the year | 193.1 | - | 100.7 | - | - | 293.8
Disposals | - | - | (12.2) | - | - | (12.2)
As at December 31, 2016(1) | 734.9 | - | 432.7 | - | - | 1,167.6
Depreciation for the period | 161.7 | - | 102.5 | - | - | 264.2
Disposals | - | - | (16.2) | - | - | (16.2)
Reclassified as held for sale(2) | (159.3) | - | (105.4) | - | - | (264.7)
As at December 31, 2017 | 737.3 | - | 413.6 | - | - | 1,150.9
CARRYING AMOUNT |  |  |  |  |  |
As at December 31, 2016(1) | 805.3 | 1,117.1 | 526.4 | 741.4 | 1.1 | 3,191.3
As at December 31, 2017 | 1,615.7 | 560.9 | 965.7 | 57.0 | 1.1 | 3,200.4
| 1. | Prior-year period comparatives have been revised as per note 5.
| 2. | Refer to Note 16 for further information on the assets held for sale.
| 3. | Effective November 1, 2017, Rainy River achieved commercial production. As a result, the Company transferred amounts capitalized to construction in progress to depletable mining properties and plant & equipment and assets capitalized as non-depletable mining properties were transferred to depletable mining properties. Additionally, on November 1, 2017, the Company transferred $20.4 million related to inventories from construction in progress to current assets.
| 4. | Refer to note 11 for further information on impairment.
Disclosure of detailed information about segmented assets and liabilities [text block] | Carrying amount by property as at December 31, 2017:
| As at December 31, 2017
(in millions of U.S. dollars) | Depletable | Non- depletable | Plant & equipment | Construction in progress | Total
mining interest by site |  |  |  |  |
New Afton | 521.8 | 22.9 | 225.7 | 15.1 | 785.5
Mesquite | 150.0 | - | 83.5 | 2.7 | 236.2
Cerro San Pedro | 0.6 | - | - | - | 0.6
Rainy River | 948.1 | 0.5 | 633.6 | 39.2 | 1,621.4
Blackwater | - | 537.5 | 14.6 | - | 552.1
Other(1) | - | 1.1 | 3.5 | - | 4.6
Carrying amount as at December 31, 2017 | 1,620.5 | 562.0 | 960.9 | 57.0 | 3,200.4
| 1. | Other includes corporate balances and exploration properties.
Carrying amount by property as at December 31, 2016:
| As at December 31, 2016
(in millions of U.S. dollars) | Depletable | Non- depletable | Plant & equipment | Construction in progress | Total
mining interest by site |  |  |  |  |
New Afton | 574.4 | 20.0 | 247.1 | 5.2 | 846.7
Mesquite | 170.3 | - | 98.2 | 3.1 | 271.6
Peak Mines | 58.6 | 9.8 | 52.5 | 0.3 | 121.2
Cerro San Pedro | 2.0 | - | - | - | 2.0
Rainy River | - | 531.0 | 109.6 | 732.8 | 1,373.4
Blackwater | - | 524.3 | 15.2 | - | 539.5
El Morro gold stream asset | - | 32.0 | - | - | 32.0
Other(1) | - | 1.1 | 3.8 | - | 4.9
Carrying amount as at December 31, 2016(2) | 805.3 | 1,118.2 | 526.4 | 741.4 | 3,191.3
| 1. | Other includes corporate balances and exploration properties.
| 2. | Prior-year period comparatives have been revised as per note 5.

X
- Definition The disclosure of detailed information about property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfPropertyPlantAndEquipmentAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of detailed information about carrying amount of property, plant and equipment by segment wise. + References No definition available. + Details
Name: | ngd_DisclosureOfDetailedInformationAboutCarryingAmountOfPropertyPlantAndEquipmentBySegmentWiseTextBlock
Namespace Prefix: | ngd_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration