Mine detail: Vermiculite Mountain Mine

Previously called 'Libby Vermiculite Mine'

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Location

Lat / long:

48.43348, -115.40853

Resource(N)

Primary:	Vermiculite
Tertiary:	Feldspar
Gangue:	Biotite, Pyroxene
Orebody form:	ROUGHLY CYLINDRICAL
Discovery year:	1915

Production

Operation type:	Unknown
Production size:	Yes
Development status:	Producer
First production started:	1925

Geology

Host rock:	Wallace Formation
Host type:	Pyroxenite
Structure:	Northwest Trending Faults And Folds In Rocks Of Belt Supergroup, Northwest Trending Syncline In Wallace Fm. Of Belt Supergroup.
Alteration processes:	Biotite To Vermiculite

References

MRDS	W013395
DEP	10070453
Reference	{Deposit:: BOETTCHER, A. L., 1967, THE RAINY CREEK ALKALINE ULTRAMAFIC IGNEOUS COMPLEX NEAR LIBBY, MONTANA, JOUR. GEOLOGY, V. 75, NO. 5, P. 526 - 553.}{Deposit:: JOHNS, W. M., 1970, GEOLOGY AND MINERAL DEPOSITS OF LINCOLN AND FLATHEAD COUNTIES; MONT. BUR. OF MINES AND GEOL. BULL. 79, P. 146 - 149.}{Production:: BUSCH, A. L. (IN PRESS), VERMICULITE IN THE UNITED STATES: IN PROCEEDINGS}
Reporter	Berg, Richard B. (Krohn, D. H.)