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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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  • Filings & News

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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
Processing
  • Flotation
Mine Life2025
The first ore from Eagle East ore body was mined and delivered to the mill on September 30, 2019.


Owners & OPERATOR

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.

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 (SMSU) sulphides and massive sulphides (MSU). Disseminated mineralization is also encountered in the peridotite intrusive, however, because it is not economic, the mineralized peridotite with disseminated sulphides has been considered as an intrusive and not a mineralized unit.

Sulphides are deposited as dense droplets in the primary magma due to decreased flow rate in the magma, or a change from laminar to turbulent flow due to changes in the conduit geometry. Multiple pulses occur in the same plumbing system, resulting in three discrete mineralization types which typically have hard contacts. The mineralizing intrusion is Mineralized Peridotite (MPER), which transports sulphides within large volumes of magma, and in this way is able to transport significant quantities of dense sulphides upward through the crust in a diluted form. This results in the conduits between mineralized zones consisting of barren peridotite or weakly mineralized peridotite, such as the upper zone of Eagle East.

Typical mineralization zoning at both Eagle and Eagle East consists of a mineralized peridotite conduit with a core of SMSU and a base of crosscutting MSU that also sills out into the surrounding sediments. The massive sulphide remains liquid for a significant time, so it is able to crosscut other units after emplacement is complete.


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


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

The Humboldt Mill is a former iron ore processing plant that was converted for processing Eagle ore. The ore is transferred from a covered coarse ore storage facility, processed using a conventional three-stage crushing and single-stage ball milling process, and processed through bulk flotation with subsequent separation flotation to produce separate nickel and copper concentrates. Metallurgical recoveries of nickel and copper average 84% and 97% respectively for Eagle Mine ore. Tailings from the plant are deposited sub aqueously in the adjacent former Humboldt iron ore mine open pit, now known as the Humboldt Tailings Disposal Facility (HTDF).

The mill was designed for a throughput of 2,000 tpd and has been shown to be capable of processing up to 2,500 tpd. The Humboldt Mill produces separate nickel and copper concentrates which are transported from the site via rail.

The Eagle process flowsheet uses conventional technologies to produce separate copper and nickel ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Nickel Recovery Rate, %  ......  Subscription required
Nickel Head Grade, % 3.7
Nickel Concentrate Grade, %  ......  Subscription required
Copper Recovery Rate, %  ......  Subscription required
Copper Head Grade, % 3
Copper Concentrate Grade, %  ......  Subscription required
Subscription required - 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  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
* 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
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of April 26, 2017:
HME TypeModelQuantity
Drill jumbo (two boom) ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 4
Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... 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
................................... Subscription required 2018
Press Release 2017
Technical Report 2017
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

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