The newly designated Sula district is located in the Bitterroot Mountains southeast of Darby, near the community of Sula. There are no known placers or lode mines in the area, although beryl deposits were discovered in the early 1950s.
According to a geological map of Ravalli County, intrusive granite from the Idaho batholith underlies most of the Sula district, with two small areas of sedimentary rocks from the Newland formation of the Belt series located east of Sula. Recent alluvium fills the lower valleys of the East Fork of the Bitterroot River and its tributaries. The beryl deposits are found in association with a vertical pegmatite dike that cuts gneissic granite (Sahinen 1957).
Curtis Wildey discovered the beryl deposits while building logging roads in 1954. They are located about 2.5 miles north of Sula in section 32, T2N, R19W. About the same time, Earl Carruthers found other deposits in the vicinity. Specimens from the two areas are similar. Neither deposit had been worked at the time of Sahinen's visit in 1954, and it is not known if they have been subsequently developed (Sahinen 1957).
BOUNDARIES OF THE DISTRICT
The boundaries of this newly designated district are not discussed in current literature. The AMRB (1994) shows the district as encompassing the upper drainage of the East Fork of the Bitterroot River (Figure 1).
HISTORIES OF SELECTED MINES
There are no known lode mines in the district.
Abandoned Mine Reclamation Bureau (AMRB)
1994 Mining districts of Montana. Maps 1:100,000 and Map #94-NRIS-129. Compiled and edited by Joel Chavez. Prepared by Montana State Library Natural Resource Information System (NRIS) for Montana Department of State Lands. Helena
Sahinen, Uuno Mathias
1957 "Mines and Mineral Deposits, Missoula and Ravalli Counties, Montana",
Bulletin No. 8
. Montana Bureau of Mines and Geology. Montana School of Mines, Butte.