| Basis for focus area |
Belt of fluorspar prospects and occurrences (about 90 km long). |
| Identified resources |
Historical production of fluorite. |
| Production |
The Giant Spar property produced a few truckloads of fluorite during WWII (Shawe, 1976). |
| Status |
Past mining. |
| Estimated resources |
Unknown. |
| Geologic maps |
Fisher and others (1992), scale 1:250,000. |
| Geophysical data |
Mostly inadequate aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Fluorite occurrences follow a NE-trending lineament that cuts the Idaho batholith and Challis volcanic rocks. Fluorite veins occur in faults and breccia zones in quartz monzonite/granodiorite of the Idaho batholith, in epithermal Au-Ag veins, and associated with Challis volcanics. |
| Deposits |
Bright Star mine (MRDS dep_id: 10089181), Giant Spar mine (MRDS dep_id: 10089180), Homestake mine (MRDS dep_id: 10070998), Gold Chance mine (MRDS dep_id: 10105687), Hide Out prospect (MRDS dep_id: 10070995), Lamb prospect (MRDS dep_id: 10070972). |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
A sample from the Lamb prospect across a 4 foot (1.2 m) vein width contained 39.4% CaF2 and showed fluorite, calcite, chalcedony, quartz, and breccia. |
| Geophysical evidence |
Unknown. |
| Evidence from other sources |
Unknown. |
| Cover thickness and description |
Exposed at surface and reaches to some depth along veins. |
| Authors |
Virginia S. Gillerman, Reed S. Lewis, Christopher A. Tate, Jane M. Hammarstrom, Joshua M. Rosera. |
| New data needs |
High resolution geophysics, lidar. |
| Geologic mapping and modeling needs |
None requested at this time. |
| Geophysical survey and modeling needs |
High resolution, Rank 1 aeromagnetic and aeroradiometric coverage. |
| Digital elevation data needs |
Lidar inadequate; only small portion in progress. |
