Commodities
PrimaryCorundum
SecondaryKyanite
Commodity typeN
Deposit
Deposit typeMetamorphic
Deposit sizeN
Orebody formLENS
Materials
Ore mineralsCorundum, Sillimanite
GangueFeldspar, Muscovite
Geology
Host rockGneiss · Pony Series-Biotite Gneiss, Quartzite
Associated rockPegmatite · Pegmatite
AlterationSericitization
Economic & production
Development statusOccurrence
Identification
Deposit ID10069794
MRDS IDW007481
RegionNA
Data scoreB
Coordinates45.51658, -111.53696
References
CLABAUGH, S. E., AND ARMSTRONG, F. C., 1950, CORUNDUM DEPOSITS OF GALLATIN AND MADISON COUNTIES, MONT.: U.S. GEOLOGICAL SURVEY BULL. 969 - B.HEINRICH, E.W., 1948, DEPOSITS OF THE SILLIMANITE GROUP OF MINERALS SOUTH OF ENNIS, MADISON CO, MONT., MONT. BUR. OF MINES & GEOL., MISC. CONT. 10, P. 18USBM INF CIRC 7641, P. 45.1950 COMPILE CLABAUGH, ARMSTRONG, BULL 969-