Commodities
PrimaryVermiculite
TertiaryFeldspar
Commodity typeN
Deposit
Deposit sizeY
WorkingsSurface
Orebody formROUGHLY CYLINDRICAL
Ore controlAbundance Of Biotite Now Altered To Vermiculite
Geology
Host rockPyroxenite · Wallace Formation
StructureNorthwest Trending Faults And Folds In Rocks Of Belt Supergroup, Northwest Trending Syncline In Wallace Fm. Of Belt Supergroup.
AlterationBiotite To Vermiculite
Economic & production
Development statusProducer
First production1925
Discovery year1915
Identification
Deposit ID10070453
MRDS IDW013395
Alternate namesLibby Vermiculite Mine
RegionNA
Data scoreB
Coordinates48.43348, -115.40853
References
BOETTCHER, A. L., 1967, THE RAINY CREEK ALKALINE ULTRAMAFIC IGNEOUS COMPLEX NEAR LIBBY, MONTANA, JOUR. GEOLOGY, V. 75, NO. 5, P. 526 - 553.JOHNS, W. M., 1970, GEOLOGY AND MINERAL DEPOSITS OF LINCOLN AND FLATHEAD COUNTIES; MONT. BUR. OF MINES AND GEOL. BULL. 79, P. 146 - 149.BUSCH, A. L. (IN PRESS), VERMICULITE IN THE UNITED STATES: IN PROCEEDINGS