Overview
Status | Care and Maintenance |
Mine Type | Open Pit |
Commodities |
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Mining Method |
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Production Start | ... |
Cleveland-Cliffs Inc. is finalizing its studies to bring back Empire. Cliffs has never shut down Empire, it put Empire on indefinite idle, which means that under the right circumstances company would bring Empire back.
Historically, Empire had an annual capacity of 5.5 million long tons; currently indefinitely idled (since 2016). |
Source:
p. 4
Empire Iron ore mining property owned by Empire Iron Mining Partnership, an indirect, wholly owned subsidiary of Cliffs.
Contractors
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Deposit Type
- Sedimentary
- Banded iron formation
Summary:
REGIONAL GEOLOGIC SETTING
The regional structures are the Niagara Fault Zone, the collision zone between the Wisconsin Magmatic Terrane and the Superior craton (Schneider et al, 2002), and the Great Lakes Tectonic Zone, which forms the boundary between Archean granite-greenstone and gneissic terranes (Sims et al, 1980). In the Marquette Range area, deformation along the Great Lakes Tectonic Zone evolved from extension and deposition (Schneider et al, 2002) to closure and transpressional deformation and basin inversion (Cambray, 2002). The resulting faultbounded shallow west plunging asymmetric syncline contains a series of second-order growth fault basins that define the detailed stratigraphic variations.
The Paleoproterozoic rocks in Michigan are termed the Marquette Range Supergroup (Cannon and Gair, 1970) and consist of three fining upward sequences (Map in Pocket). The lower portion has been correlated with the upper part of the Ontario Huronian (~2.2 Ga) and the upper parts, which contain the 1875 Ma iron formations, with the Mesabi Range of Minnesota. Simplistically, the sequence is from the Chocolay Group shelf facies quartzites and dolomite to the Menominee Group with argillites and the major iron formations to turbidites, greywacke and shale along with minor iron formation in the Baraga Group. Mafic igneous rocks with a continental tholeiite geochemical signature (Schulz, 1983) are present in the Menominee and Baraga Groups. Basal quartzites in each ........
Summary:
The Empire mine is located on the Marquette Iron Range in Michigan’s Upper Peninsula approximately 15 miles southwest of Marquette, Michigan. The Empire mine has had no production since the indefinite idle began in August 2016, compared to historically having an annual capacity of 5.5 million long tons of iron ore pellets.
Prior to the indefinite idle, operations consisted of an open pit truck and shovel mine, a concentrator that utilizes single stage crushing, AG mills, magnetic separation and floatation to produce a magnetite concentrate that was then supplied to the on-site pellet plant. From the site, pellets were transported by CN rail to a ship loading port at Escanaba, Michigan, operated by CN.
Source:
Source:
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Production:
Empire was indefinitely idled beginning on August 3, 2016.
Commodity | Units | 2016 | 2015 |
Iron Ore
|
M long tons
| 2.8 | 3 |
All production numbers are expressed as pellets.
Operational Metrics:
Metrics | 2016 | 2015 |
Annual production capacity
| 5.5 M long tons of iron ore pellets | 5.5 M long tons of iron ore pellets |
Reserves at December 31, 2015:
Category | Tonnage | Commodity | Grade |
Proven
|
8.6 M long tons
|
Iron (magnetite)
|
22.5 %
|
Mine Management:
Job Title | Name | Profile | Ref. Date |
.......................
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.......................
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Feb 15, 2024
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