Maderposson

The Maderposson is a feldspar 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: Maderposson  

State:  South Dakota

County:  Pennington

Elevation: 4,400 Feet (1,341 Meters)

Commodity: Feldspar, Beryllium

Lat, Long: 43.8625, -103.36917

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 Maderposson

Maderposson MRDS details

Site Name

Primary: Maderposson


Commodity

Primary: Feldspar
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: Earl A. Madill


Production

Not available


Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1941
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

Form: DIKE


Structure

Not available


Alterations

Not available


Rocks

Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Neoproterozoic


Analytical Data

Not available


Materials

Ore: Feldspar
Ore: Beryl


Comments

Comment (Location): NEAR THE CENTER OF THE SECTION

Comment (Development): UNPATENTED LODE CLAIM

Comment (Workings): A SINGLE SMALL EXPLORATION PIT


References

Reference (Deposit): U. S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2 BUREAU OF MINES INFORMATION CIRCULAR 7707


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