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Dan Patch Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA

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Latitude & Longitude (WGS84): 43° 53' 40'' North , 103° 26' 30'' West
Latitude & Longitude (decimal): 43.89444,-103.44167
GeoHash:G#: 9xy3wnspd
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Granite pegmatite.

A feldspar and beryllium mine located in sec. 7, T.2S., R.6E. near Mount Rushmore.

Mineralization is an oval, pipe-like pegmatite body concordant in quartz-biotite schist.

Workings include a large open cut.


Mineral List


25 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 Macrostrat.org

Paleoproterozoic
1600 - 2500 Ma



ID: 2472506
Metagraywacke unit 2

Age: Proterozoic (1600 - 2500 Ma)

Description: Middle part of metagraywacke unit Xgw. Lithologically similar to unit Xgw3. Pelitic parts may contain sillimanite near Harney Peak Granite. Unit underlies mica schist unit (unit Xts) in Pactola Lake area but is shown as Xgw where Xts pinches out to the north. Overlies unit Xqc to the southeast in the Rockerville-Keystone area, where unit may be as much as 2,000 m thick and is largely proximal turbidites. North of Hill City, unit apparently pinches out.

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]

Paleoproterozoic
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]

Paleoproterozoic
1600 - 2500 Ma



ID: 2797792
Metagraywacke

Age: Proterozoic (1600 - 2500 Ma)

Description: Light- to dark-gray, silceous mica schist and impure quartzite. Differentiated where possible into three primary tongues or lenses. (Xgw1, Xgw2, and Xgw3) Thickness from 1,000 ft to over 5,000 ft (305-1,524 m).

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License



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References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Moore, P. B., 2000, Analyses of Primary Phosphates from Pegmatites in Maine and Other Localities, in V. T. King (editor), Mineralogy of Maine. Mining History, Gems, and Geology, Maine Geological Survey, Augusta, Maine, p. 333-336.
Norton, James J. (1964) Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E.
Rocks & Minerals: 60: 116.
Rocks & Minerals: 75(3): 156-169.
Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bureau of Mines Information Circular 8298: 32 (Table A-1).

Mineral and/or Locality  
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