Blue Butte, Bonus Extension Group, Mica-Beryl Mine, Rock King Prospect, Silver Rocker Group

Region West, Rocky Mountains
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

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.