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

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 Location:
20 SW from Marquette, Michigan, United States

  Address:
PO Box 2000
Ishpeming
Michigan, United States
49849
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WebsiteWeb
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  • Mining
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  • Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Iron Ore
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life25 years (as of Jan 1, 2021)


Owners

Source: p. 6
CompanyInterestOwnership
Cleveland-Cliffs Inc. 100 % Indirect
Tilden Mining Company L.C. (operator) 100 % Direct
Tilden iron ore mining property is owned by Tilden Mining Company L.C., an indirect, wholly-owned subsidiary of Cliffs.

Contractors

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Deposit Type

  • Banded iron formation


Summary:

The Tilden iron deposit is an example of a Lake Superior-type BIF deposit. These types of deposits occur worldwide, represent the largest global source of iron ore, and were deposited between 2,700 Ma and 1,800 Ma, formed by chemical precipitation in shallow waters such as continental shelves. Precipitation of iron oxides was due to low atmospheric and ocean oxygen levels resulting in increased iron content in sea water. These deposits are typically characterized by alternating layers of iron oxides and SiO2 -rich material such as cherts or SiO2 -rich sediments.

The Tilden BIF deposit forms the base of the Negaunee IF of the Menominee Group within the MarqueSe Range Super Group. The Tilden BIF is Proterozoic in age and sits on the southern margin of the Marquette trough. It is fault-bounded to the south by Archean gneiss terrane, with the fault contact dipping steeply north and aligning with the south wall of the Main Pit at Tilden.

The Tilden BIF is interbedded with three distinct, syn-sedimentary, mafic intrusive sills: The Summit Mountain Sill, the Suicide Sill, and the Tilden Lake Sill, as well as associated smaller dikes and sills. There is a younger dike series of Keweenawan age (approximately 1.0 Ga) that crosscuts bedding. Alteration is present along all intrusive contacts, with the type and extent of alteration dependent on the thickness of the intrusive and the composition of the iron formation (Lukey et al., 2007). Brittle fractures and late q ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Tilden deposit is mined using conventional surface mining methods, with surface operations including:
• Overburden (glacial till) removal;
• Drilling and blasting (excluding overburden);
• Loading and haulage;
• Crushing and rail loading.

Tilden Mineral Reserves are based on ongoing annual crude ore production of 20 MLT to 22 MLT producing approximately 7.7 MLT of wet hem flux pellets for domestic consumption.

Mining and processing operations are scheduled 24 hours per day, and mine production is scheduled to directly feed the processing operations.

The current LOM plan has mining scheduled for 25 years and mines the known Mineral Reserve. The average stripping ratio is approximately 1.2 waste units to 1 crude ore unit (1.2 stripping ratio).

The final Tilden pit is a single pit approximately 2.5 mi along strike, up to 0.9 mi wide, and up to 1,980 ft deep.

The Tilden operation has strict crude ore blending requirements to ensure the Plant receives a consistent crude ore feed. The most important characteristics of the crude ore are the crude ore iron grade and predicted concentrate mass recovery, and Conc_Fe, silica, and phosphorus content. Operationally, blending is completed on a shift-by-shift basis. Generally, three to four crude ore loading points are mined simultaneously with dispatch operators issuing real-time adjustments to meet specified crude ore blends for the Plant.

Crude o ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits2022202120202019201820172016
Iron Ore Pellets M long tons  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required7.77.77.6
Iron Ore Concentrate kt
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Operational Metrics:

Metrics202220212020201920182017
Annual production capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required8 M long tons of iron ore pellets8 M long tons of iron ore pellets8 M long tons of iron ore pellets
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required21.5 M long tons21 M long tons21 M long tons
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required21.5 M long tons21 M long tons21 M long tons
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Reserves at December 31, 2022:
Mineral Reserves and Mineral Resources are estimated at a cut-off grade:25% FeT for Tilden hematite.

CategoryTonnage CommodityGrade
Proven 4 M long tons Iron (hematite) 35.3 %
Probable 500 M long tons Iron (hematite) 34.7 %
Proven & Probable 504 M long tons Iron (hematite) 34.7 %
Indicated 135 M long tons Iron (hematite) 35.5 %
Measured & Indicated 135 M long tons Iron (hematite) 35.5 %
Inferred 350 M long tons Iron (hematite) 34.7 %

Financials:

Units2022
Book Value M USD  ......  Subscription required
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Pipelines and Water Supply
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Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelSizeQuantity
Dozer (crawler) ....................... Subscription required 57 cu. yd ....................... Subscription required
Drill (blasthole) 16 inch ....................... Subscription required
Grader ....................... Subscription required 14 ft ....................... Subscription required
Loader ....................... Subscription required 37 cu. yd ....................... Subscription required
Shovel ....................... Subscription required 44 cu. yd ....................... Subscription required
Truck (haul) ....................... Subscription required 320 tons ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 22, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 27, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 27, 2023
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Staff:

EmployeesYear
Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Fact Sheet 2022
Form 10-K 2022
Other 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Fact Sheet 2018
Form 10-K 2018
Fact Sheet 2017
Form 10-K 2017
Annual Report 2016
Annual Report 2015
Other 2015
Annual Report 2014
Other 2008
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