Commodities
PrimaryMica
TertiaryBeryllium
Commodity typeB
Deposit
Deposit sizeS
WorkingsSurface/Underground
Orebody formLENTICULAR
Ore controlMica Bearing Zone, Several Feet Wide, Extends Into Both The Border Zone And The Core
Materials
Ore mineralsBeryl, Muscovite
GangueApatite, Biotite, Kyanite, Oligoclase, Quartz, Tourmaline
Geology
Host rockMica Schist
Associated rockPegmatite
StructureBelow The 55 Ft Level Is A Strong Fracture Zone Related To A Fault That Strikes N10w And Dips 20 Ne. There Is Little Displacement, But There Are Numerous Related Joints.
Economic & production
Development statusPast Producer
Discovery year1942
Identification
Deposit ID10097813
MRDS IDD008100
RegionNA
Data scoreB
Coordinates43.72274, -103.61667
References
U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707.ROBERTS, W.L., AND RAPP, GEORGE, 1965, MINERALOGY OF THE BLACK HILLS, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY BULLETIN 18.USGS PP 247, P. 190-191.U.S. BUREAU OF MINES INFORMATION CIRCULAR 7707.