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Upper Spring Creek quarry, Pennington Co., South Dakota, USAi
Regional Level Types
Upper Spring Creek quarryQuarry
Pennington Co.County
South DakotaState

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Latitude & Longitude (WGS84):
43° 54' North , 103° 45' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
Hill City995 (2017)14.5km
Custer1,952 (2017)19.1km
Keystone343 (2017)26.6km
Johnson Siding659 (2017)32.3km
Hill View Heights170 (2006)33.9km

A small stone quarry located west of Bobcat Road just north of the Medicine Mountain Boy Scout Camp. Latitude and longitude were estimated from USGS Medicine Mountain 7.5' quadrangle map and are approximate.

Traces of rutile were noted in crushed landscaping stone at a newly constructed apartment building in Custer, South Dakota, in 1999. A long chain of inquiries led to this quarry as the source of the stone. Permission to collect was secured from the operator of the quarry, and several specimens were acquired at that time. Current (2014) operating status and ownership have not been determined.

Host rock appears to be a quartzite schist containing abundant muscovite. Veins filled with a dense brown iron oxide-stained carbonate contain crudely formed but clear quartz crystals, muscovite in sharp, free-standing crystals, long prismatic rutile crystals, and crystals of at least two species not yet identified.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

3 valid minerals.

Detailed Mineral List:

Formula: KAl2(AlSi3O10)(OH)2
Reference: E. L. Clopton Collection
Formula: SiO2
Reference: E. L. Clopton Collection
Formula: TiO2
Reference: E. L. Clopton Collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Group 9 - Silicates

List of minerals arranged by Dana 8th Edition classification

Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

List of minerals for each chemical element

H MuscoviteKAl2(AlSi3O10)(OH)2
O RutileTiO2
O QuartzSiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
Ti RutileTiO2

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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