Mine detail: Grand Island Group

Previously called ''

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Location

Lat / long:

43.90524, -103.42973

Resource(M)

Primary:	Gold, Silver
Ore:	Gold, Pyrite, Pyrrhotite, Silver
Gangue:	Quartz

Production

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

Geology

Associated rock:	Diorite
Associated type:	Diorite

References

MRDS	D004737
DEP	10010770
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.