Spar Lake (Troy)

Region West, Northwest
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Red-bed copper-silver deposits.
Identified resources Historical production of copper and silver.
Production Troy mine (1981-1993): 180,000 lbs Cu and 44.4 million oz Ag.
Status Past mining; currently in permitting stage (Revett Minerals).
Estimated resources Troy mine: Proven and Probable reserves of 16.45 million tons @ 1.04 opt Ag and 0.36% Cu, contained 17.1 million oz Ag and 119.75 million lbs Cu.
Geologic maps Vuke and others (2007), scale 1:500,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric data.
Favorable rocks and structures Contiguous, shallow-dipping ore body that can be traced throughout the Cabinet Mountains.
Deposits Troy Lake mine (MRDS dep_id: 10124835).
Evidence from mineral occurrences MRDS; Montana Bureau of Mines and Geology Mining Archives; Gammons and others (2020).
Geochemical evidence None.
Geophysical evidence None.
Evidence from other sources Unknown.
Cover thickness and description Unknown.
Authors Kaleb C. Scarberry.
New data needs Geologic mapping, geophysical, and geochemical surveys.
Geologic mapping and modeling needs Geologic mapping.
Geophysical survey and modeling needs High resolution geophysical survey.
Digital elevation data needs Lidar inadequate.