Beryl Mica Lode

The Beryl Mica Lode is a feldspar mine located in Custer county, South Dakota at an elevation of 5,400 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: Beryl Mica Lode
Secondary: Dakota Feldspar Mine

Commodity

Primary: Feldspar
Secondary: Mica
Secondary: Beryllium

Location

State: South Dakota
County: Custer
District: Pringle 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

Type: Surface/Underground

Ownership

Owner Name: Dakota Feldspar Co.

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1920
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: LARGE DIKE

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: Microcline
Ore: Mica
Ore: Beryl
Gangue: Quartz
Gangue: Tourmaline

Comments

Comment (Deposit): THESE ARE NORTH WALL ZONE MEASUREMENTS. FELDSPAR IS FROM A 10 FT THICK MASS THAT FORMED THE SOUTH WALL OF THE OLD MICA ZONE. 2 UNPATENTED CLAIMS.

Comment (Workings): MOST MICA WAS MINED THROUGH A GLORY HOLE ABOVE A CROSSCUT. FELDSPAR WAS MINED THROUGH A LARGE OPEN CUT FOLLOWING THE DIKE.

References

Reference (Production): USBM INFO CIRC 7707, P. 186

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

Reference (Deposit): ROBERTS, W.L., AND RAPP, GEORGE, 1965, MINERALOGY OF THE BLACK HILLS, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY BULLETIN 18

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