Iron Mountain District
The district is made of three primary topographic highs along an approximately 17 mile lineament: Iron Mountain to the southwest, Granite Mountain in the middle, and The Three Peaks in the northwest. Mineralization in this district occurred as rings around the highs as a skarn, a replacement of existing carbonate rock material with high-grade iron ore, mostly in the form of high-grade (>50%Fe in places) magnetite, but also locally hematite. Minor pyrite is also present. Hot fluids are sourced from mid-Tertiary intrusions, which core all three areas.
Magnetite and hematite occur as replacements in the Jurassic limestone around three Laramide orogeny, quartz monzonite porphyry, laccolith intrusions. The iron ore was discovered by a Mormon scouting party in 1849, and furnaces were established in Cedar City in 1852, and then Old Irontown in 1868, to produce pig iron. Total production by 1965 from the district was 72,136,297 long tons of iron ore.
Major areas of iron deposits and their associated mines/pits/ore bodies include:
- Iron Mountain
- Blowout
- Blackhawk
- Comstock
- Mountain Lion
- Tip Top
- Pinto
- Chesapeake
- Excellsior
- Homestake
- Granite Mountain
- Desert Mound
- Queen of the West
- Three Peaks
References
- ^ Bullock, K. C., 1970, Iron Deposits of Utah, Utah Geological and Mineral Survey Bulletin 88, 102 pgs.
- ^ Mackin, J. (1968). Ridge, John (ed.). Iron Ore Deposits of the Iron Springs District, Southwestern Utah, in Ore deposits of the United States, 1933-1967. New York: The American Institute of Mining, Metallurgical, and Petroleum engineers, Inc. pp. 992–1019.
External links
- "Iron Springs". Geographic Names Information System. United States Geological Survey. Retrieved 2012-12-22.
37°44′59″N 113°14′05″W / 37.74972°N 113.23472°W
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