CANADIAN AND WORLD MINERAL DEPOSIT DATABASES
Geological Survey of Canada


Deposit number Country Location Names Commodities
120 United States (Missouri) 38.07.36 N -- 091.02.47 W Pea Ridge Fe; REE; Au
 
Database name: World Fe-oxide+/-Cu-Au-U (IOCG) deposits
Compilers: Sunil S. Gandhi
Release date: 2015-03-04
   
Deposit name(s): Pea Ridge
Political location(s): United States; Province or state: Missouri
Deposit clan (type): Kiruna-type
Deposit (sub) types: pipelike massive
Deposit status: producer; Size category: 100 Mt; Status comments: Production started in 1968
Geologic province: St. Francois Mountains Granite-Rhyolite Terrane
Geologic subprovince: St. Francois Mountains
Deposit object located: buildings
Commodities: Fe; REE; Au
Mineralization styles: breccia-fillings; tabular body; apatite veins; quartz veins
Geological ages: Middle Proterozoic (country rocks)
Tectonic setting: continental platform-intracratonic; stable (host rocks)
Coincident features: fractures and breccia zones; Coincident feature name: Olympic Dam-type breccia zone
Host rocks: (1) volcanic; felsic volcanic rocks (brecciated); Magma series/sedimentary package/metamorphic group: calc-alkaline; Metamorphic grade: unmetamorphosed
External host rock forms:ash flow tuffs
flows
Internal host rock structures:breccia
Related igneous rocks: (1) intrusive; granite suite (inferred from geological and magnetic data); Initials: Pea Ridge granite
Individual lithologies:granite

(2) intrusive; syenite-syenogabbro suite (magnetite-rich ring intrusion around Pea ridge granite)
Individual lithologies:trachytic ring intrusion (magnetite-rich ring intrusion)

(3) intrusive; gabbro-diorite suite (intruded along east-west dilatant fractures)
Individual lithologies:mafic dykes (intruded along east-west dilatant fractures)

(4) intrusive; granite suite
Individual lithologies:alaskite dykes
Country rocks: (1) felsic volcanics; (rhyolites and dacites); Metamorphic grade: unmetamorphosed
(2) trachytic intrusion; (ring complex); Metamorphic grade: unmetamorphosed
Metallogenic signatures: Fe
au
P
Sn
REE
Alteration signatures: hematization: alteration extensive; What was altered: host rocks and ore
chloritization: around the deposit; What was altered: host rocks
silicification: alteration extensive; What was altered: host rocks
potassic alteration: potash feldspar; What was altered: feldspar in host rock
pyritization: pyrite; What was altered: hematite ore
Mineralogy: (mineralization): magnetite>>hematite, apatite, actinolite, rare earth minerals, pyrite, molybdenite, barite, rutile, anatase
(vein mineralization): quartz, xenotime, apatite, pyrite
Radiometric ages: Object dated: Mineralization Style(4); Age - Ma: 1,465; Dating method: U-Pb; Concentrate: xenotime; Source rock: quartz vein; Event dated: mineralization; Interpretive comment: Mineralization-related vein in the 1400-1500 Ma range of U-Pb zircon age for the host volcanic rocks; Reference: Marikos, M. A.; Nuelle, L. M.; Seeger, C. M., 1989: Geology of the Pea Ridge Mine; 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. 41 - 54
References:
Bickford, M. E.; Mose, D. G., 1975
Geochronology of Precambrian Rocks in the St. Francois Mountains, Southeast Missouri
Special Paper, Geological Society of America, Geological Society of America, Publication code 165, 48 p.

Bickford, M. E. ; Sides, J. R.; Cullers, R. L., 1981
Chemical Evolution of Magmas in the Proterozoic Terrane of the St. Francois Mountains, Southeastern Missouri: 1. Field, Petrographic, and Major Element Data
Journal of Geophysical Research, Volume 86, p. 10365 - 10386

Bickford, M. E.; Van Schmus, W. R.; Zietz, I., 1986
Proterozoic History of the Midcontinent Region of North America
Geology, Volume 14, p. 492 - 496

Brown, V. M., 1989
Geological Overview of the Southern St. Francois Mountains, Missouri
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. 93 - 109

Cullers, R. L.; Koch, R. J.; Bickford, M. E., 1981
Chemical Evolution of Magmas in the Proterozoic Terrane of St. Francois Mountains, Southeastern Missouri; 2. Trace Element Data
Journal of Geophysical Research, Volume 86, p. 10388 - 10401

Emery, J. A., 1968
Geology of the Pea Ridge Iron Ore Body
in Ore Deposits of the United States, 1933-1967, Graton-Sales Volume, Edited by Ridge, J. D., 2 Volumes, American Institute of Mining and Petroleum Engineers (AIME), 1880 p, p. 359 - 369

Gandhi, S. S.; Bell, R. T., 1996
Kiruna/Olympic Dam Iron-Copper-Uranium-Gold
in Geology of Canadian Mineral Deposit Types, Edited by Eckstrand, O. R.; Sinclair, W. D.; Thorpe, R. I., Geology of Canada, Decade of North American Geology (DNAG), Geological Survey of Canada, Geological Society of America, Volume 8, 640 p, p. 513 - 522

Gower, C. F.; Ryan, B.; Rivers, T., 1990
Mid-Proterozoic Laurentia-Baltica - an Overview of Its Geological Evolution and a Summary of Contributions Made in This Volume
in Mid-Proterozoic Laurentia-Baltica, Edited by Gower, C. F.; Ryan, B.; Rivers, T., Special Paper, Geological Association of Canada, 38, 581 p, p. 1 - 20

Hitzman, M. W.; Oreskes, N.; Einaudi, M. T., 1992
Geological Characteristics and Tectonic Setting of Proterozoic Iron Oxide (Cu-U-Au-REE) Deposits
Precambrian Research, Volume 58, p. 241 - 287

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

Marikos, M. A.; Nuelle, L. M.; Seeger, C. M., 1989
Geology of the Pea Ridge Mine
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. 41 - 54

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., 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.

Sides, J. R.; Bickford, M. E.; Shuster, R. D.; Nusbaum, R. L. , 1981
Calderas in the Precambrian Terrane of the St. Francois Mountains, Southeastern Missouri
Journal of Geophysical Research, Volume 86, p. 10349 - 10364

Resource data:
Disclaimer - Reserves/Resource Data

Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources (NRCan) does not warrant or guarantee the accuracy, completeness or fitness for any purpose of Reserve and Resource information (Data) contained in this database, including whether the Data is compliant with any securities regulations or standards, and NRCan does not assume any liability with respect to any damage or loss incurred as a result of the use made of the Data.

Resource and reserve figures are historical in nature. The Data source provided with each set of figures should be cited if the Data are re-reported.

Estimate date: 2006; Component: Open pit and underground; 678.3 million short tons ore; Combined with production?: no; Provisional entry?: no; Resource category: proven+probable reserve
Grade-commodity information:Fe: 57 percent
Also containingEstimate date: 2000; 200,000 short ton ore; Combined with production?: no; Provisional entry?: no
Grade-commodity information:REE oxides: 12 percent
Reference: 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.
Percent weights allocated to deposit: 100.0%
Reference: Anonymous, 2006: Wings Iron Ore Mining Company; Wings Iron Ore Mining Company, Missouri, Home Page, Internet
Percent weights allocated to deposit: 100.0%
Associated mine(s): Pea Ridge Mine (9)

Generated 2015-03-04 14:17:13 with GQuery -- 3.7 ADO (3.19..3.22 -- 2008-12-16)
GlobalDB System, Geological Survey of Canada, Natural Resources Canada