Rainbow No. 4 Claim

The Rainbow No. 4 Claim is a feldspar, beryllium, and mica mine located in Custer county, South Dakota at an elevation of 5,561 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: Rainbow No. 4 Claim

Commodity

Primary: Feldspar
Primary: Beryllium
Primary: Mica

Location

State: South Dakota
County: Custer
District: Custer District

Land Status

Administrative Organization: Black Hills

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Consolidated Feldspar Corp.
Home Office: Trenton, N.J.

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
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

Form: DIKES

Structure

Type: L
Description: N20e

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

Analytical Data: MICA SHOW "A" STRUCTURE AND AIR STAINING.

Materials

Ore: Mica
Ore: Feldspar
Ore: Beryl
Gangue: Vanadinite
Gangue: Triphylite
Gangue: Uraninite
Gangue: Tourmaline
Gangue: Quartz
Gangue: Garnet
Gangue: Uranophane

Comments

Comment (Location): USGS PP 247 LISTS T3S. THE MAP AND USBM CIRC 7707 LIST T4S.

Comment (Deposit): UNPATENTED CLAIM. 2 GOOD-SIZED DIKES. THE LARGE DIKE IS MADE UP OF THREE ZONES. THE INTERMEDIATE ZONE CONTAINS 10 - 20% MICA AND 1 - 2% BERYL. MICA IS 10% OF THE WALL ZONE AND FELDSPAR CONSISTS OF 60% OF THE WALL ZONE.

Comment (Workings): 1 SMALL CUT IN EACH OF THE DIKES.

References

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 DAKORA SCHOOL OF MINES AND TECHNOLOGY BULLETIN 18.

Reference (Deposit): USGS PP 247, P. 181-183.

Reference (Production): U.S. BUREAU OF MINES INFO CIRC 7707.

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