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
Elevation: 5,561 Feet (1,695 Meters)
Commodity: Feldspar, Beryllium, Mica
Lat, Long: 43.72972, -103.69500
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.
Rainbow No. 4 Claim MRDS details
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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