CANADIAN AND WORLD MINERAL DEPOSIT DATABASES
Geological Survey of Canada


Deposit number Country Location Names Commodities
187 United States (Missouri) 37.37.08 N -- 090.38.00 W Pilot Knob Mine Fe
 
Database name: World Fe-oxide+/-Cu-Au-U (IOCG) deposits
Compilers: Sunil S. Gandhi
Release date: 2015-03-04
   
Deposit name(s): Pilot Knob Mine
Political location(s): United States; Province or state: Missouri; Subprovince or locality: St. Francois Mountains
Deposit clan (type): Kiruna-type
Deposit (sub) types: Fe oxide subtype
Deposit status: past producer
Geologic province: St. Francois Mountains Granite-Rhyolite Terrane
Geologic subprovince: St. Francois Mountains
Commodities: Fe
Mineralization styles: massive underground body/stratiform
Geological ages: Middle Mesoproterozoic (country rocks)
Middle Mesoproterozoic (host rocks)
Middle Mesoproterozoic (mineralization)
Tectonic setting: continental craton-intracratonic; stable (host rocks)
Coincident features: subvolcanic ring intrusions (trachytic ring intrusions in rhyolite volcanic complex; intruded by central granite pluton)
Host rocks: (1) volcanic; felsic volcanic rocks; Magma series/sedimentary package/metamorphic group: calc-alkaline; Depositional setting: subaerial; Metamorphic grade: unmetamorphosed
External host rock forms:flows
ash flows

(2) intrusive; unclassified granitoid rocks (trachytic intrusion); Magma series/sedimentary package/metamorphic group: alkaline; Depositional setting: subvolcanic
Individual lithologies:trachyte
Country rocks: (1) felsic volcano-plutonic assemblage; (ring complex); Country rock name: St. Francois Mountains terrane; Metamorphic grade: unmetamorphosed
Metallogenic signatures: Fe
Mineralogy: (mineralization): hematite, magnetite
Qualified comments: (Applies to: discovery and development) Production from the surface hematite orebody started in 1835, and continued intermittently till early 1920s; average grade 50 % Fe. Production from the subsurface magnetite orebody (just west of the surface hematite body) started in 1967 and ended in 1980; total of 20 Mt.
References:
Anderson, L. C., 1976
The Pilot Knob Hematite Deposit, Pilot Knob, Southeast Missouri
M. Sc. thesis (unpublished), Univeristy of Wisconsin, 80 p.

Anonymous, 2000
Inventory of Mines, Occurrences, and Prospects (IMOP).
Missouri Department of Natural Resources, Iron Deposits of the St. Francois Mountains, Internet

Kisvarsanyi, E. B.; Hebrank, A. W.; Ryan, R. F., 1981
Guidebook to the Geology and Ore Deposits of the St. Francois Mountains, Missouri
Report of Investigations (#67)/Contribution to Precambrian Geology, Missouri Geological Survey/ Department of Natural Resources, Division of Geology and Land Survey, Publication code 9, 119 p.

Kisvarsanyi, E. B., 1981
Geology of the Precambrian St. Francois Terrane, Southeastern Missouri
Report of Investigations (Contribution to Precambrian Geology), Missouri Geological Survey, Publication code 64 (8), 58 p.

Kisvarsanyi , E. B. , 1984
The Precambrian Tectonic Framework of Missouri As Interpreted from the Magnetic Anomaly Map
Report of Investigations/Contribution to Precambrian Geology, Missouri Geological Survey/Missouri Dept. of Natural Resources, Division of Geology and Land Survey, Publication code 14b, 19 p.

Kisvarsanyi, G.; Kisvarsanyi, E. B., 1989
Precambrian Geology and Ore Deposits of the Southeast Missouri Iron Metallogenic Province
in Olympic Dam-Type Deposits and Geology of Middle Proterozoic Rocks in the St. Francois Mountains Terrane, Missouri, Edited by Brown, V. M.; Kisvarsanyi, E. B.; Hagni, R. D., Guidebook Series, Society of Economic Geologists, Volume 4, p. 1 - 41

Panno, S. V.; Hood, W. C., 1983
Volcanic Stratigraphy of the Pilot Knob Iron Deposits, Iron County, Missouri
Economic Geology, Volume 78, p. 972 - 982

Pratt, W. A.; Sims, P. K., 1988
The Midcontinent of the United States - Permissive Terrane for an Olympic Dam-Type Deposit?
U. S. Geological Survey Bulletin, United States Geological Survey, U. S. Department of the Interior, Publication code 1932, 81 p.

Seeger, C. M.; Marikos, M. A.; Nuelle, L. M., 1989
The Pilot Knob Hematite Deposit
in Olympic Dam-Type Deposits and Geology of Middle Proterozoic Rocks in the St. Francois Mountains Terrane, Missouri, Edited by Brown, V. M.; Kisvarsanyi, E. B.; Hagni, R. D., Guidebook Series, Society of Economic Geologists, Volume 4, p. 55 - 68

Seeger, C. M., 2000
Iron Deposits of the St. Francois Mountains, Southeast Missouri.
unpublished report, Division of Geology and Land Survey, Missouri Department of Natural Resouces., 26 p.

Wracher, D. A. , 1976
Geology of the Pilot Knob Magnetite Deposit, Southeast Missouri
in Studies in Precambrian Geology of Missouri, Edited by Anonymous, Report on Investigations, Missouri Division of Geology and Land Surveys , p. 155 - 163


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