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Oreville, Custer Co., South Dakota, USA

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Latitude & Longitude (WGS84): 43° 51' 56'' North , 103° 37' 20'' West
Latitude & Longitude (decimal): 43.86574,-103.62226
Köppen climate type:Dfb : Warm-summer humid continental climate

South of town.

Mineral List

12 valid minerals.

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.

Click on geological units on the map for more information. Click here to view full-screen map on

1600 - 2500 Ma

ID: 3191697
Paleoproterozoic crystalline metamorphic rocks

Age: Proterozoic (1600 - 2500 Ma)

Lithology: Paragneiss

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

1600 - 2500 Ma

ID: 2471943
Metamorphosed tuff and shale

Age: Proterozoic (1600 - 2500 Ma)

Description: Greenish-gray to tan phyllite and muscovite-biotite schist. At higher metamorphic grades, muscovite schist may contain andalusite, sillimanite, garnet, staurolite, or cordierite. Manganese-rich garnet coticle, magnetite octahedra, and traces of chalcopyrite are distinctive components in Berne, Hill City, Silver City, Medicine Mountain, and Deerfield 7.5-minute quadrangles. Subunits rich in magnetite and ilmenite produce strong magnetic anomalies. Included as part of Oreville Formation in Hill City area by Ratté and Wayland (1969). Unit includes increasing number of metagraywacke beds to the northeast and loses distinctive identity a few kilometers north of Pactola Lake. East of Mystic (T. 1 N., R. 3 E.), unit includes thin alkalic metabasalt (unit Xby). West toward Rochford, unit is equivalent to tuffaceous shale, tuff, and volcaniclastic rocks (unit Xtv), in which tuff within the volcaniclastic rocks has a U-Pb zircon age of 1,883 ± 5 Ma (Redden and others, 1990). Thickness as much as 700 m.

Reference: Redden, J.A., E. DeWitt. Maps Showing Geology, Structure, and Geophysics of the Central Black Hills, South Dakota. U.S. Geological Survey Scientific Investigations Map 2777. [73]

1600 - 2500 Ma

ID: 2797802
Metagraywacke Unit 2

Age: Proterozoic (1600 - 2500 Ma)

Description: Middle Xgw- Light- to dark-gray, silceous mica schist and impure quartzite.

Lithology: Major:{mica schist,quartzite}

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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