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Pea Ridge Mine, Sullivan, Washington Co., Missouri, USA

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Latitude & Longitude (WGS84): 38° 7' 33'' North , 91° 2' 51'' West
Latitude & Longitude (decimal): 38.12611,-91.04750
Köppen climate type:Cfa : Humid subtropical climate

A former Fe mine located near Meramec State Park and 13.8 km (8.6 miles) SE of Sullivan. Owned by the St. Joe Domestic Metals Corp, a subsidiary of the Fluor Corp. The Meramec Mining Company (which was a partnership between St Joe and Bethleham Steel Corporation) was the owner until 1978. Produced 1.3 million tons of ore pellets (1984). Mine was closed and flooded in 2001.

Rare earth elements (REE)−bearing breccia pipes cut through the Pea Ridge massive magnetite-iron orebody. The Pea Ridge deposit is hosted by Precambrian volcanic rocks of the St. Francois terrane of southeastern Missouri. The magnetite-rich orebody is interpreted as a high-temperature, magmatic-hydrothermal deposit (Sidder and others, 1993) in ash-flow tuffs and lavas, which may have formed in the root of a volcanic caldera (Nuelle and others, 1991). Four mapped REE-bearing breccia pipes steeply crosscut the magnetite-hematite orebody and its altered rhyolite host rock. Exposed portions of the breccia pipes are as much as 60 m (197 ft) in horizontal length and as much as 15 m (49 ft) in width; the pipes extend below the mined levels to an undetermined depth (Seeger and others, 2001). Rare earth elements–bearing minerals in the breccia pipes include monazite, xenotime, and minor bastnasite and britholite. The REE concentrations reported in the breccia pipes are consistently high but variable. Nuelle and others (1992, p. A1) state, “Total REE oxide content of samples of the groundmass material, which are not diluted with lithic fragments, average about 20 weight percent.” Seeger and others (2001, p. 2) state, “Total REE oxide concentrations of grab samples range from about 2.5 to 19 weight percent.” Bulk sampling by the U.S. Bureau of Mines found REE oxides concentrations ranging from 7 to 25 weight percent and an average of 12 weight percent (Vierrether and Cornell, 1993).
A populated place (town).

Mineral List

53 valid minerals.

Rock Types Recorded

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

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Early Ordovician
470 - 485.4 Ma

ID: 2742491
Gasconade Dolomite

Age: Early Ordovician (470 - 485.4 Ma)

Stratigraphic Name: Gasconade Dolomite

Description: Coarse - crystalline cherty dolomite with a basal Gunter Sandstone Member.

Comments: IN SOUTHEAST MO-Gasconade Dolomite- (700 ft max) coarsely crystalline cherty dolomite with basal sandstone member; Gunter Sandstone Member- (30 ft. max) quartzose sandstone. Host to barite deposits on the northwest flank of Ozark Uplift.

Lithology: Major:{dolostone}, Minor:{sandstone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Mining Annual Review (1985): 325.
C. W. Whitten and R. J. Yancey (1991) Characterization of the Rare-earth Mineralogy at the Pea Ridge Deposit, Missouri. USBM Report of Investigations 9331.
Vierrether and Cornell (1993).
Rocks and Minerals (1998): 73(2) (March-April 1998).
Nuelle, Laurence (2001), Mineral News: 17(9): 5.
USGS Open File Report 2010-5220.
Grauch, R.I., Verplanck, P.L., Seeger, C.M., Budahn, J.R., and Van Gosen, B.S. (2010): Chemistry of Selected Core Samples, Concentrate, Tailings, and Tailings Pond Waters: Pea Ridge Iron (-Lanthanide-Gold) Deposit, Washington County, Missouri. USGS Open-File Report 10-1080.

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