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United States
Eagle East Expansion Project

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 Location:
44 km E from L'Anse, Michigan, United States

  Project Contacts:
4547 County Road 601
Champion
Michigan, United States
49814
Phone  ...  Subscription required
Fax(906)- 339-7005
EmailEmail
WebsiteWeb
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Overview

StatusArchived
Mine TypeUnderground
Commodities
  • Nickel
  • Copper
  • Cobalt
  • Gold
  • Silver
Mining Method
  • Bench & Fill
  • Transverse open stoping
  • Longitudinal retreat
  • Cemented backfill
Mine Life2025
The first ore from Eagle East ore body was mined and delivered to the mill on September 30, 2019.


Owners

Source: p. 10
CompanyInterestOwnership
Lundin Mining Corp. 100 % Indirect
Eagle Mine LLC (operator) 100 % Direct
The Eagle East project is 100% owned and operated by Eagle Mine LLC, an indirect wholly owned subsidiary of Lundin Mining Corp.

Contractors

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Deposit Type

  • Magmatic


Summary:

Magmatic sulphide deposits containing nickel (Ni) and copper (Cu), with or without (±) platinum-group elements (PGMs), account for approximately 60% of the world’s Ni production and are active exploration targets in the United States and elsewhere. On the basis of their principal metal production, magmatic sulphide deposits in mafic rocks can be divided into two major types: those that are sulphide-rich, typically with 10 to 90% sulphide minerals, and have economic value primarily because of their Ni and Cu contents; and those that are sulphide-poor, typically with 0.5 to 5% sulphide minerals, and are exploited principally for PGE.

The Eagle deposit and the Eagle East conduit zone are high-grade magmatic sulphide accumulations containing nickel-copper mineralization and minor amounts of cobalt and PGMs. The economic minerals associated with this deposit are predominately pentlandite and chalcopyrite.

Eagle and Eagle East are part of the same ultramafic intrusive complex and both host high grade primary magmatic nickel copper sulphide mineralization. Mineralization styles are similar at Eagle and Eagle East, consisting of ovoid to pipe-like bodies of mineralized peridotite with concentrations of sulphide mineralization along the base of the intrusion resulting in the accumulation of semi-massive sulphide, and a central core zone of massive sulphide.

Two types of potentially economic mineralization are found in Eagle and Eagle East: semimassive ........


Mining Methods

  • Bench & Fill
  • Transverse open stoping
  • Longitudinal retreat
  • Cemented backfill


Summary:

Mine production is made up of a combination of ore development through sill drifts or cuts and stope production. The mining method selected for Eagle and Eagle East is the Transverse Sub Level Open Stoping (SLOS) method using a combination of Cemented rock fill (CRF) and nonconsolidated waste rock backfill. This method provides the cost advantages of bulk mining, while maintaining a degree of selectivity and operational flexibility. The majority of the stopes will be mined as transverse bench and fill stopes, with some narrower zones of the orebody mined as longitudinal retreat stopes.

The mining method used at Eagle is suitable to exploit the material at Eagle East, namely a primary/secondary sequence of transverse open stopes with cemented backfill or rockfill. Some longitudinal stopes are used to exploit the narrower sections or the orebody at the extremities.

The Eagle orebody is accessed by the sub-level footwall drives driven off the main decline at 20 m to 25 m vertical intervals. Stopes are designed at 10 m wide and approximately 25 m high (corresponding to the top and bottom sub levels). Stope lengths will vary depending on the width of the orebody, however, due to geotechnical constraints, individual stope panels are limited to a maximum length of 20 m. The same general dimensions will be used for the Eagle East development.


Crushing and Grinding
Flow Sheet: Source


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsLOM
Nickel Metal in concentrate t 48,117
Nickel Metal in ore t 56,784
Copper Metal in concentrate t  ......  Subscription required
Copper Metal in ore t  ......  Subscription required

Operational Metrics:

Metrics
Daily milling rate 1,615 t *
Waste tonnes, LOM 1,008 kt *
Ore tonnes mined, LOM 1,544 kt *
Total tonnes mined, LOM 2,552 kt *
Tonnes processed, LOM 1,544 kt *
* According to 2017 study.

Reserves at June 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Probable 2,321 kt Nickel 3.2 % 75 kt
Probable 2,321 kt Copper 2.6 % 61 kt
Probable 2,321 kt Gold 0.3 g/t
Probable 2,321 kt Silver 10 g/t 0.74 M oz
Indicated 1,865 kt Nickel 4.3 % 81 kt
Indicated 1,865 kt Copper 3.5 % 65 kt
Indicated 1,865 kt Gold 0.4 g/t
Indicated 1,865 kt Silver 13 g/t 1 M oz
Inferred 522 kt Nickel 2.3 % 12 kt
Inferred 522 kt Copper 1.6 % 8 kt
Inferred 522 kt Gold 0.1 g/t
Inferred 522 kt Silver 6 g/t

Commodity Production Costs:

CommodityUnitsAverage
Credits (by-product) Nickel USD -3.87 / lb *  
C1 cash costs Nickel USD 3.68 / lb *  
C1 cash costs Nickel USD -0.19 / lb *†  
Assumed price Nickel USD 7.5 / lb *  
Assumed price Copper USD 3 / lb *  
* According to 2017 study / presentation.
† Net of By-Product.

Operating Costs:

Units2017
UG mining costs ($/t milled) USD 64.7
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
Subscription required - Subscription is required.

2017 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 10% $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Proposed Heavy Mobile Equipment as of April 26, 2017:
HME TypeModelQuantity
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Year-end Mineral Reserves 2018
Press Release 2017
Technical Report 2017
Subscription required - Subscription is required.

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