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United States
Minorca Mine (Cleveland-Cliffs 'Steelmaking segment' Operation)

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 Location:
90 km N from Duluth, Minnesota, United States

  Address:
5950 Old Highway 53 N
Virginia
Minnesota, United States
55792
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Iron Ore
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life14 years (as of Jan 1, 2021)


Owners

Source: p. 21
CompanyInterestOwnership
Cleveland-Cliffs Inc. 100 % Indirect
Cleveland-Cliffs Minorca Mine Inc. (operator) 100 % Direct
Minorca iron ore mining property is owned by Cleveland- Cliffs Minorca Mine Inc. (f/k/a ArcelorMittal Minorca Mine Inc.), an indirect, wholly owned subsidiary of Cliffs acquired in connection with the AM USA Transaction.

Cleveland-Cliffs Minorca Mine Inc. (CCMMI) is the operator of the Minorca property.

Contractors

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Deposit Type

  • Banded iron formation


Summary:

The Minorca deposits are examples of Superior-type BIF deposits, specifically the Biwabik Iron Formation (Biwabik IF), which is interpreted to have been deposited in a shallow, tidal marine setting and is characterized as having four main members (from bottom to top): Lower Cherty, Lower Slaty, Upper Cherty, and Upper Slaty. Cherty units generally have a sandy granular texture, are thickly bedded, and are composed of silica and iron oxide minerals. Slaty units are fine grained, thinly bedded, and comprised of iron silicates and iron carbonates, with local chert beds, and they are typically uneconomic. The mineral of economic interest at Minorca is magnetite.

The Biwabik IF at Minorca consists primarily of carbonates, iron silicates, fine-grained quartz, and iron oxides. These layers are visually distinct, locally separated into slaty beds and cherty beds. The ratio of slaty to cherty beds and distance between these beds are key indicators used during logging, as well as bedding style, texture, color, and magnetic strength. Slaty beds are dark gray in nature, consisting primarily of magnetite in mineralized zones, and range from one millimeter (0.04 in.) to upwards of two centimeters (0.78 in.) in thickness. Cherty beds range from gray to green in color depending on the ratio of fine-grained quartz (gray color) to iron silicates (green color). These beds vary in thickness to upwards of 10 cm (3.9 in.) and may or may not contain disseminated magnetite. Carbonates ty ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Laurentian, East 1, and East 2 areas are mined using conventional surface mining methods. The surface operations include:
• Clearing and grubbing;
• Overburden (glacial till) removal;
• Drilling and blasting (excluding overburden);
• Loading and haulage.

The open-pit operation at Minorca has a mining rate of approximately 8.6 million long tons (MLT) of ore per year and produces 2.8 MLT of wet flux iron ore pellets.

The current LOM plan has mining for 14 years and mines the known Mineral Reserve. The average stripping ratio is 0.8 waste units to 1 crude ore unit (0.8 stripping ratio).

The final Laurentian Pit is approximately 1.2 mi long along strike, 0.9 mi wide, and up to 640 ft deep. Crude ore averages approximately 24.4% MagFe. The final East 1 Pit is approximately 0.9 mi along strike, 0.5 mi wide, and up to 310 ft deep. Crude ore within the East 1 Pit averages approximately 22.5% MagFe. The East 2 final pit is approximately 0.7 mi along strike, 0.4 mi wide, and up to 350 ft deep. The East 2 Pit crude ore contains an average of 23.7% MagFe.

Primary production for all mine pits includes drilling a combination of 12.25 in.- and 16.00 in.-diameter rotary blast holes. Production blast hole depth varies as the pit benches transition from the footwall contact to a full 35 ft bench height. Burden and spacing varies depending on the material being drilled. The holes are filled with explosive and blasted. A comb ........


Crushing and Grinding
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Processing

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Summary:

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^ Guidance / Forecast.

Production:

CommodityProductUnits2022202120202019201820172016
Iron Ore Pellets M long tons  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required2.82.82.8
Iron Ore Lump M long tons
Iron Ore Concentrate kt
^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Total tonnes mined  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required8.39 M long tons8.65 M long tons8.71 M long tons
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required7.49 M long tons7.93 M long tons6.46 M long tons
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required
Annual production capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required8.75 M long tons8.65 M long tons8.71 M long tons
^ Guidance / Forecast.
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Reserves at December 31, 2021:
Mineral Reserves and Mineral Resources are estimated at a cut-off grade of 16% crude MagFe.

CategoryTonnage CommodityGrade
Proven 102.8 M long tons Iron 23.7 %
Probable 6.8 M long tons Iron 25.1 %
Proven & Probable 109.7 M long tons Iron 23.8 %
Measured 484.3 M long tons Iron 22.9 %
Indicated 317.2 M long tons Iron 22.9 %
Measured & Indicated 801.5 M long tons Iron 22.9 %
Inferred 30.1 M long tons Iron 21.1 %

Commodity Production Costs:

CommodityUnits2022
Cash costs Iron Ore USD  ......  Subscription required&nbs
^ Guidance / Forecast.
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Financials:

Units2022
Capital expenditures (planned) M USD  ......  Subscription required
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Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelSizeQuantity
Bulldozer ....................... Subscription required 29 cu. yd ....................... Subscription required
Drill (blasthole) ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required 16 ft ....................... Subscription required
Loader ....................... Subscription required 19 cu. yd ....................... Subscription required
Shovel (hydraulic) ....................... Subscription required 26 cu. yd ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2022
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Staff:

EmployeesYear
Subscription required 2021
Subscription required 2020
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Fact Sheet 2018
Annual Report 2017
Annual Report 2016
Fact Sheet 2016
Annual Report 2015
Annual Report 2015
Form 20-F 2015
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