Mine detail: Gilliam Vermiculite Deposit

Previously called 'Pony Vermiculite Deposit'

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Location

Lat / long:

45.7124, -111.93614

Resource(N)

Primary:	Vermiculite
Ore:	Vermiculite
Gangue:	Feldspar, Garnet, Quartz
Orebody form:	UNKNOWN

Production

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

Geology

Host rock:	Gneiss And Schist;Amphibolite
Host type:	Schist
Associated type:	Hornblendite
Tectonic:	Northeast Flank Of Tobacco Root Mts.
Alteration processes:	Biotite To Vermiculite

References

MRDS	W013392
DEP	10070450
Reference	PERRY, E. S., 1948, TALC, GRAPHITE, VERMICULITE, AND ASBESTOS IN MONTANA: MONT. BUREAU OF MINES AND GEOLOGY MEM. 27, P. 32 - 3
Reporter	Berg, Richard B. (Krohn, D. H.)