Mine detail: Helen Beryl

Previously called ''

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Location

Lat / long:

43.71274, -103.69668

Resource(B)

Primary:	Beryllium, Feldspar
Secondary:	Mica
Tertiary:	Tantalum
Ore:	Albite, Beryl, Mica, Microcline
Gangue:	Apatite, Quartz, Spodumene
Orebody form:	LENTICULAR

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer

Geology

Host type:	Mica Schist
Associated type:	Pegmatite
Tectonic:	Southern Black Hills

References

MRDS	SD02469
DEP	10104268
Reference	{Deposit:: U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707}{Deposit:: ROBERTS, W.L., AND RAPP, GEORGE, 1965, MINERALOGY OF THE BLACK HILLS, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY BULLETIN 18}
Reporter	Barari, Rachel A.