The Keystone Lode is a beryllium, lithium, and mica mine located in Custer county, South Dakota at an elevation of 5,600 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 5,600 Feet (1,707 Meters)
Commodity: Beryllium, Lithium, Mica
Lat, Long: 43.74194, -103.70111
Map: View on Google Maps
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Keystone Lode MRDS details
Site Name
Primary: Keystone Lode
Commodity
Primary: Beryllium
Primary: Lithium
Primary: Mica
Location
State: South Dakota
County: Custer
District: Custer District
Land Status
Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Administrative Organization: Black Hills
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Maywood Chemical Co. Of Maywood, Nj
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Interior Plains
Physiographic Province: Great Plains Province
Physiographic Section: Black Hills
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Name: Pegmatite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic
Analytical Data
Analytical Data: 5% OF THE PEGMATITE IS MICA. THE BERYL CRYSTALS ARE PALE YELLOW AND ABOUT 4 INCHES IN DIAMETER
Materials
Ore: Beryl
Ore: Muscovite
Ore: Amblygonite
Gangue: Hornblende
Gangue: Albite
Gangue: Quartz
Gangue: Pyrrhotite
Gangue: Microcline
Comments
Comment (Deposit): EXACT SHAPE AND DIP OF PEGMATITE HAVE NOT BEEN DETERMINED
Comment (Workings): SEVERAL SHALLOW CUTS
References
Reference (Deposit): USGS PP 247, P. 141
Reference (Deposit): USBM INFO CIRC 7707, P. 120
Reference (Deposit): SDSMT BULL 18
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