| Basis for focus area |
MRDS producers and past producers. |
| Identified resources |
Historical production of beryllium (beryl), feldspar, mica, niobium (columbite), and tantalum (tantalite). |
| Production |
Small volumes of production. |
| Status |
Past mining. |
| Estimated resources |
No data. |
| Geologic maps |
Scott and others (1978), scale 1:250,000; Wallace and Lawson (2008), scale 1:24,000; Wallace and others (1997), scale 1:24,000. |
| Geophysical data |
Inadequate Rank 3 aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Pegmatite. |
| Deposits |
Blue Butte, Bonus Extension Group, Mica-Beryl mine, Rock King Prospect, Silver Rocker Group. |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
Beryl and columbite-tantalite have been reported (Hanley and others, 1950). |
| Geophysical evidence |
No data. |
| Evidence from other sources |
Unknown. |
| Comments |
Scandium inferred from mineral system/deposit type table (Hofstra and Kreiner, 2020). |
| Cover thickness and description |
No cover. |
| Authors |
David A. Ponce, Nora K. Foley, Michael K. O'Keeffe, Joshua M. Rosera. |
| New data needs |
Modern geophysics. |
| Geologic mapping and modeling needs |
Mapped at 1:24,000 scale. |
| Geophysical survey and modeling needs |
High resolution, Rank 1 aeromagnetic and aeroradiometric surveys, although this may not work well with this deposit type. |
| Digital elevation data needs |
Lidar in progress in western half of focus area; complete in eastern half. |
