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

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.

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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