Mine detail: Helen Group

Previously called 'Helen No. 5Helen LodeHelen No. 1Helen No. 2Helen No. 3Helen No. 4'

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Location

Lat / long:

43.71413, -103.61806

Resource(N)

Primary:	Feldspar
Ore:	Feldspar
Gangue:	Mica, Quartz, Tourmaline
Orebody form:	DIKES

Production

Operation type:	Unknown
Production size:	None
Development status:	Occurrence

Geology

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

References

MRDS	SD02483
DEP	10055745
Reference	U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 770
Reporter	Barari, Rachel A.