The Marquette Iron Range is a deposit of

iron ore Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red. The iron is usually found in the fo ...

located in

Marquette County, Michigan Marquette County ( ) is a county located in the Upper Peninsula of the U.S. state of Michigan. As of the 2020 Census, the population was 66,017. The county seat is Marquette. The county is named for Father Marquette, a Jesuit missionary. It wa ...

in the United States. The towns of

Ishpeming Ishpeming ( ) is a city in Marquette County in the Upper Peninsula of the U.S. state of Michigan. The population was 6,470 at the 2010 census, less than it was in the 1950s and 1960s when the iron ore mines employed more workers. A statue of a ...

and

Negaunee Negaunee ( or ) is a city in Marquette County in the U.S. state of Michigan. The population was 4,568 at the 2010 census. The city is located at the southwest corner of Negaunee Township, which is administratively separate, in the Upper Peni ...

developed as a result of mining this deposit. A smaller counterpart of Minnesota's

Mesabi Range The Mesabi Iron Range is a mining district in northeastern Minnesota following an elongate trend containing large deposits of iron ore. It is the largest of four major iron ranges in the region collectively known as the Iron Range of Minnesota. ...

, this is one of two iron ranges in the

Lake Superior Lake Superior in central North America is the largest freshwater lake in the world by surface areaThe Caspian Sea is the largest lake, but is saline, not freshwater. and the third-largest by volume, holding 10% of the world's surface fresh wa ...

basin that are in active production as of 2018. The iron ore of the Marquette Range has been mined continuously from 1847 until the present day. Marquette Iron Range is the deposit's popular and commercial name; it is also known to geologists as the Negaunee Iron Formation.

History

The geology of the district consists of middle

Precambrian The Precambrian (or Pre-Cambrian, sometimes abbreviated pꞒ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of the ...

rocks in the

Animikie Group The Animikie Group is a geologic group composed of sedimentary and metasedimentary rock, having been originally deposited between 2,500 and 1,800 million years ago during the Paleoproterozoic era, within the Animikie Basin. This group of formati ...

, which form a westward plunging

syncline In structural geology, a syncline is a fold with younger layers closer to the center of the structure, whereas an anticline is the inverse of a syncline. A synclinorium (plural synclinoriums or synclinoria) is a large syncline with superimpose ...

long and wide. The principal

is found in the Negaunee Iron

formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondar ...

. This formation is thick near Negaunee. This is a

magnetite Magnetite is a mineral and one of the main iron ores, with the chemical formula Fe2+Fe3+2O4. It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. With the ...

hematite Hematite (), also spelled as haematite, is a common iron oxide compound with the formula, Fe2O3 and is widely found in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of . ...

chert Chert () is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert is characteristically of biological origin, but may also occur inorganically as a prec ...

. Natural ore deposits are located in synclines and up against

mafic A mafic mineral or rock is a silicate mineral or igneous rock rich in magnesium and iron. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include ...

dikes Dyke (UK) or dike (US) may refer to: General uses * Dyke (slang), a slang word meaning "lesbian" * Dike (geology), a subvertical sheet-like intrusion of magma or sediment * Dike (mythology), ''Dikē'', the Greek goddess of moral justice * Dikes ...

Beneficiation In the mining industry or extractive metallurgy, beneficiation is any process that improves (benefits) the economic value of the ore by removing the gangue minerals, which results in a higher grade product (ore concentrate) and a waste stream (tail ...

commenced in 1954 and this concentration of iron into pellets accounted for 73 percent of production by 1965. Early mining used

open-pit mining Open-pit mining, also known as open-cast or open-cut mining and in larger contexts mega-mining, is a surface mining technique of extracting rock or minerals from the earth from an open-air pit, sometimes known as a borrow. This form of mining ...

methods, but was replaced with

underground mining Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef, or placer deposit. The exploitation of these deposits for raw material is based on the economic via ...

by 1880. The Marquette Iron Range was discovered in 1844 by a party of

surveyor Surveying or land surveying is the technique, profession, art, and science of determining the terrestrial two-dimensional or three-dimensional positions of points and the distances and angles between them. A land surveying professional is ca ...

s led by William A. Burt, who found that their sensitive magnetic

compass A compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with ...

es produced skewed results because of the concentration of iron in the land they were surveying. Mining began in 1847. At first, the

iron ore of the Marquette Range was smelted with local

charcoal Charcoal is a lightweight black carbon residue produced by strongly heating wood (or other animal and plant materials) in minimal oxygen to remove all water and volatile constituents. In the traditional version of this pyrolysis process, cal ...

into

pig iron Pig iron, also known as crude iron, is an intermediate product of the iron industry in the production of steel which is obtained by smelting iron ore in a blast furnace. Pig iron has a high carbon content, typically 3.8–4.7%, along with silic ...

, but after the opening of the first Soo Canal in 1855 the iron ore itself began to be shipped down the Great Lakes from the newly developed port city of Marquette. Capitalists from

Cleveland Cleveland ( ), officially the City of Cleveland, is a city in the U.S. state of Ohio and the county seat of Cuyahoga County. Located in the northeastern part of the state, it is situated along the southern shore of Lake Erie, across the U.S. ...

played a key role in the development of the Marquette Iron Range, and the

Cleveland-Cliffs Iron Company Cleveland-Cliffs Inc., formerly Cliffs Natural Resources, is a Cleveland, Ohio-based company that specializes in the mining, beneficiation, and pelletizing of iron ore, as well as steelmaking, including stamping and tooling. It is the largest f ...

acquired a controlling influence on the range by 1890.

The iron range today

Until 2016, Cleveland-Cliffs’ Empire and Tilden mines continued to produce iron ore from the Marquette Range. However, the Empire Mine officially ceased production on Tuesday, August 2, 2016 and was placed in an indefinite idle state. Cleveland-Cliffs ships Tilden ore by a wholly owned short-line railroad, the Lake Superior and Ishpeming, to Marquette for transport by

lake freighter Lake freighters, or lakers, are bulk carrier vessels that operate on the Great Lakes of North America. These vessels are traditionally called boats, although classified as ships. Since the late 19th century, lakers have carried bulk cargoes of m ...

to steel mills in the lower Great Lakes. The Marquette Iron Range was designated as a Michigan registered historic site in 1957, listed as S-0035. The Cliffs Shaft Mine Museum in Ishpeming and the

Michigan Iron Industry Museum The Michigan Iron Industry Museum, a branch facility of the Michigan Historical Center, is a community museum serving the heritage of the Marquette Iron Range on Michigan's Upper Peninsula. The museum is located in Negaunee, a town built atop t ...

in Negaunee each celebrate the history of the iron ore deposit and its miners. A

hiking trail A trail, also known as a path or track, is an unpaved lane or small road usually passing through a natural area. In the United Kingdom and the Republic of Ireland, a path or footpath is the preferred term for a pedestrian or hiking trail. The ...

from

Republic A republic () is a "state in which power rests with the people or their representatives; specifically a state without a monarchy" and also a "government, or system of government, of such a state." Previously, especially in the 17th and 18th c ...

to Marquette, called the Iron Ore Heritage Trail, also provides access to the area's historical sites.

References

{{Reflist Mining in Michigan Geography of Marquette County, Michigan Iron ore deposits

History

The iron range today

See also

References