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United States
Eagle Mine

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

  Address:
4547 County Road 601
Champion
Michigan, United States
49814
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  • Overview
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  • Fleet
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Nickel
  • Copper
  • Silver
  • Gold
Mining Method
  • Longitudinal open stoping
  • Drift & Fill
  • Sub-level open stoping (SLOS)
  • Transverse open stoping
  • Cemented backfill
  • Backfill
Production Start...
Mine Life2027
Eagle is an underground mine producing nickel and copper concentrates.


Owners

Source: p. 5
CompanyInterestOwnership
Lundin Mining Corp. 100 % Indirect
Eagle Mine LLC (operator) 100 % Direct
Eagle Mine means the Eagle nickel and copper mine owned by Eagle Mine LLC, a wholly-owned indirect subsidiary of the Lundin Mining.

Contractors

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Deposit Type

  • Magmatic


Summary:

Deposit Type
Magmatic sulphide deposits containing nickel and copper, with or without PGMs, account for approximately 60% of the world’s nickel 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 sulphide rich and sulphide poor. Sulphide rich deposits typically have 10% to 90% sulphide minerals and have economic value primarily because of their nickel and copper contents. Sulphide poor deposits typically contain 0.5% to 5% sulphide minerals and are exploited principally for Platinum Group Metals (PGM).

The Eagle and Eagle East deposits are sulphide rich and high-grade magmatic sulphide accumulations containing nickel-copper mineralization and minor amounts of cobalt and PGMs. The economic minerals associated with these deposits are predominately pentlandite and chalcopyrite.

The mineralization process common to all primary magmatic sulphide deposits consists of: 1) Metal-rich ultramafic magma intruding into the crust, typically in an extensional environment; 2) Sulphur saturation through geochemical contamination by crustal rocks resulting in primary sulphide droplets forming; 3) Metal enrichment of sulphides by interaction with large volumes of subsequent magma flow; and 4) Deposition of sulphides by density settling where magma flow slows due to structural traps or major changes in the geometry of the plumbi ........


Mining Methods

  • Longitudinal open stoping
  • Drift & Fill
  • Sub-level open stoping (SLOS)
  • Transverse open stoping
  • Cemented backfill
  • Backfill


Summary:

The Eagle Mine is an underground mine producing about 2,000 tpd of high-grade nickel-copper ore. The ore is hauled to surface in diesel-powered trucks via the ramp and then trucked to the Humboldt processing plant at a separate site.

Mining Methods
Eagle Mine uses three mining methods, TSLOS, LSLOS and D&F. Combinations of all three methods are used in Eagle, Eagle East, and the Keel Zone.

Transverse Sublevel Open Stoping (TSLOS)
The portion of the deposit between two sublevels is mined by dividing the ore into alternating primary and secondary stopes, extending in parallel from the footwall to the hangingwall. The stopes in Eagle Zone are 10 m wide and range in height from 18 to 29 m, depending on the sublevel internal. The stopes in Eagle East Zone are also 10 m wide but range in height from 25-28 m.

In wider parts of the deposit, the stopes are not mined as single excavations extending from footwall to hangingwall. Instead, each one is divided into panels, thereby limiting the length of the opening to a maximum of 32 m. This distance is based on the ability to complete the stope cycle in less than 60 days at typical mucking and backfilling rates. Multiple panels are mined one after the other in a retreating fashion from the hangingwall to the footwall.

The primary stopes are mined first, leaving ore pillars of the same dimension between primary stopes that will subsequently be mined as secondary stopes. Then, the mined- ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2023202220212020201920182017
Nickel t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required17,57322,081
Copper t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required748 kt753 kt760 kt
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required747 kt754 kt754 kt
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Daily ore mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Plant annual capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required700 kt700 kt700 kt
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Reserves at December 31, 2022:
The Eagle Mineral Resource and Mineral Reserve estimates are reported using NSR cut-offs of $138/t, $140/t and $156/t for Eagle, Upper Keel and Eagle East zones, respectively.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 3,430 kt Nickel 1.64 % 56 kt
Proven & Probable 3,430 kt Copper 1.28 % 44 kt
Proven & Probable 3,430 kt Silver 5.54 g/t 610 koz
Proven & Probable 3,430 kt Gold 0.13 g/t 14 koz
Measured & Indicated 3,856 kt Nickel 1.88 % 72 kt
Measured & Indicated 3,856 kt Copper 1.44 % 55 kt
Measured & Indicated 3,856 kt Silver 6.06 g/t 751 koz
Measured & Indicated 3,856 kt Gold 0.15 g/t 19 koz
Inferred 26 kt Nickel 0.95 %
Inferred 26 kt Copper 0.87 %

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Credits (by-product) Nickel USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -3.56 / lb   -3.37 / lb  
Cash costs Nickel USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 4.57 / lb   4.3 / lb  
Cash costs Nickel USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1.01 / lb†   0.93 / lb†  
All-in sustaining costs (AISC) Nickel USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1.84 / lb†   1.42 / lb†  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units20162015
Total operating costs ($/t milled) USD 115.97138.25

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 45.8   39.5  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 10   11.4  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 265.9   276.5  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 74.2  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 44.4   10.9  
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Water Supply
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Heavy Mobile Equipment as of December 31, 2022:
HME TypeModelQuantityLeased or
Contractor
Backhoe ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Explosives Charger ....................... Subscription required ....................... Subscription required
Explosives Charger ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Personnel Carrier ....................... Subscription required ....................... Subscription required
Shotcreter ....................... Subscription required ....................... Subscription required
Telescopic Handler ....................... Subscription required ....................... Subscription required Leased
Trans Mixer ....................... Subscription required ....................... Subscription required
Truck ....................... Subscription required ....................... Subscription required
Truck (fuel / lube) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Feb 27, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2016
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Annual Information Form 2022
Management Discussion & Analysis 2022
Technical Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Management Discussion & Analysis 2018
Press Release 2018
Sustainability Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Press Release 2017
Sustainability Report 2017
Technical Report 2017
Year-end Mineral Reserves 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Annual Information Form 2015
Corporate Presentation 2015
Management Discussion & Analysis 2015
Year-end Mineral Reserves 2015
Technical Report 2013
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