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Eureka

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

Name: Eureka  

State:  South Dakota

County:  Pennington

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.


Satelite image of the Eureka

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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