Mine detail: Mcarthur Mine

Previously called 'Firestone'

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Location

Lat / long:

43.70329, -103.62667

Resource(B)

Primary:	Mica
Secondary:	Beryllium, Feldspar
Ore:	Beryl, Feldspar, Mica
Gangue:	Albite, Garnet, Quartz, Tourmaline, Xenotime
Orebody form:	ELONGATED DIKE

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1900

Geology

Host type:	Mica Schist,Pegmatite
Associated type:	Pegmatite
Structure:	Well-Developed Folds Plunge 40-50 Deg, S12-15w
Alteration processes:	Some Parts Of The Pegmatite Are Severely Altered

References

MRDS	D008114
DEP	10012469
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.}{Deposit:: USGS PP 247, P. 146-148.}{Production:: USBM INFO CIRC 7707, P. 153; USGS PP 247, P. 146.}
Reporter	Barari, Rachel A.