The Eureka is a feldspar, mica, and beryllium mine located in Pennington county, South Dakota at an elevation of 4,400 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: 4,400 Feet (1,341 Meters)
Commodity: Feldspar, Mica, Beryllium
Lat, Long: 43.86917, -103.38889
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.
Eureka MRDS details
Site Name
Primary: Eureka
Commodity
Primary: Feldspar
Primary: Mica
Primary: Beryllium
Location
State: South Dakota
County: Pennington
District: Unorganized 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 National Forest
Holdings
Not available
Workings
Not available
Ownership
Owner Name: George Madill And William Graham Of Keystone, Sd
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
Not available
Materials
Ore: Muscovite
Ore: Feldspar
Ore: Beryl
Gangue: Cleavelandite
Gangue: Quartz
Gangue: Microcline
Gangue: Tourmaline
Comments
Comment (Deposit): UNPATENTED LODE CLAIM
Comment (Location): N OF CENTER OF S LINE OF SECTION 15
Comment (Commodity): SOME MICA IS SHEET QUALITY
Comment (Workings): A SERIES OF SMALL TEST PITS (1943)
References
Reference (Deposit): USBM CIRC 7707, P. 71
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