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
Elevation: 5,400 Feet (1,646 Meters)
Commodity: Feldspar
Lat, Long: 43.63333, -103.55611
Map: View on Google Maps
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Beryl Mica Lode MRDS details
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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