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Approximately 325 million tons of this ore was mined from around 40 individual mines between 1877 and 1967. Iron mines of the era exploited the "natural" (soft) iron-rich ores in a 15 kilometer-long stretch in the central portion of the range straddling the Michigan-Wisconsin state line.
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From 1.7 to 1.6 billion years ago granite and rhyolite emplaced in south-central Wisconsin. The Baraboo and Waterloo Quartzite in the south and the Barron Quartzite in the northwest are slightly younger, along with the slate, dolomite, conglomerate and chert included in Wolf River rocks at Rib Mountain, Mosinee Hill and the McCaslin Quartzites.
Iron Mountain is the principal city of the Iron Mountain, MI–WI Micropolitan Statistical Area, which includes all of Dickinson County, Michigan and Florence County in Wisconsin. Iron Mountain hosts a few points of interest such as the Millie Hill bat cave [6] and the Chapin Mine Steam Pump Engine, and is located adjacent to the Pine Mountain ...
Iron ore was discovered in what is now the Iron Mountain area in 1878. [2] Development was rapid: Iron Mountain was platted in 1879 and the Chapin Mine Company was formed the same year. The Chapin Mine proved to be the most productive in the Menominee Range, [ 2 ] but part of the orebody was underneath a cedar swamp [ 4 ] and water seepage ...
The taconite iron ore pellets are hauled by railroad to the ports of Silver Bay, Two Harbors and the Twin Ports of Duluth, Minnesota, and Superior, Wisconsin, all on Lake Superior. The docks at Escanaba, Michigan, on Lake Michigan, also ship taconite from the Marquette iron range in Michigan, and occasionally ore from Minnesota is hauled by ...
Sioux Quartzite at Falls Park, Sioux Falls, South Dakota Cross-bedding in the Sioux Quartzite, Blue Mounds State Park, Minnesota, United States.. The Sioux Quartzite is a Proterozoic quartzite that is found in the region around the intersection of Minnesota, South Dakota, and Iowa, and correlates with other rock units throughout the upper midwestern and southwestern United States.
Iron formations can be divided into subdivisions known as: banded iron formations (BIFs) and granular iron formations (GIFs). [ 3 ] The above classification scheme is the most commonly used and accepted, though sometimes an older system is used which divides iron-rich sedimentary rocks into three categories: bog iron deposits , ironstones , and ...