Brown Derby

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 Many MRDS producers and past producers nearby. For example, Buckhorn, Bucky Pegmatite, Quartz Creek Pegmatite District.
Identified resources Historical production of beryllium (beryl), lithium (lepidolite), scrap mica, niobium (columbite), REE (monazite), and tantalum.
Production Recorded production of pegmatite minerals from the Quartz Creek district is 51 tons of beryl, 283 tons of lepidolite, 140 tons of scrap mica, 5,000 lbs of tantalum and columbium minerals, and 15 lbs of monazite (Staatz and Trites, 1955).
Status Past mining.
Estimated resources Any reserves are small and generally low grade.
Geologic maps Staatz and Trites (1955), various scales.
Geophysical data Inadequate Rank 3 aeromagnetic coverage over 50% of focus area with remainder Rank 5; Rank 2 (50%) and Rank 5 (50%) aeroradiometric coverage.
Favorable rocks and structures Pegmatites intrude Precambrian rocks, which include quartzite hornblende tonalite, hornblende gneiss, granite, and quartz monzonite.
Deposits Brown Derby mine (MRDS dep_id: 10239376), Buckhorn, Bucky Pegmatite, Quartz Creek Pegmatite District.
Evidence from mineral occurrences MRDS.
Geochemical evidence Staatz and Trites (1955) describe 27 observed minerals, including beryl, tourmaline, and lepidolite.
Geophysical evidence No data.
Evidence from other sources No data.
Comments The Quartz Creek pegmatite district contain 1,803 pegmatites intruded into Precambrian rocks (Staatz and Trites, 1955).
Cover thickness and description Exposed at the surface; depth unknown.
Authors David A. Ponce, Nora K. Foley, Michael K. O'Keeffe.
New data needs 1:24,000 scale geologic mapping.
Geologic mapping and modeling needs 1:24,000 scale geologic mapping at Parlin and Pitkin quadrangles.
Geophysical survey and modeling needs High resolution, Rank 1 aeromagnetic and radiometric surveys.
Digital elevation data needs Lidar adequate.