Castle Dome fluorite

Region West, Southwest
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Approximate outline of Castle Dome district.
Identified resources Historical production of fluorite.
Production Estimated 4000 tons fluorite produced from 1902 to 1953 (Elevatorski, 1971).
Status Past mining.
Estimated resources Unknown.
Geologic maps Grubensky and others (1993); scale 1:62,500.
Geophysical data Inadequate Rank 5 aeromagnetic and Rank 3 aeroradiometric coverage.
Favorable rocks and structures Fluorite mineralization hosted in veins; wallrocks include diorite and shale. Fluorite also occurs in Pb-Ag ores (Elevatorski, 1971).
Deposits Big Dome (MRDS dep_id: 10098207), Rialto Group (MRDS dep_id: 10103550), Senora Mine Group (MRDS dep_id: 10037075), Little Dome mine (MRDS dep_id: 10046347), De Luce Claims (MRDS dep_id: 10060288).
Evidence from mineral occurrences MRDS.
Geochemical evidence Barite is reported to also occur with fluorite mineralization (Elevatorski, 1971). U.S. Bureau of Mines reports samples ranging from 11 to 44% fluorite. Fluorite associated with barite, galena and wulfenite in veins.
Geophysical evidence Unknown.
Evidence from other sources No data.
Comments Mineral system unclear. Deposit inferred to be some combination of Fluorspar with Polymetallic sulfide (for example, galena-fluorite vein association). Actual enrichment of Sb, As, Ga, Ge, and In is inferred from the mineral system/deposit type table (Hofstra and Kreiner, 2020). Polymetallic veins generally similar to those above porphyry systems, but exact genetic association requires more work.
Cover thickness and description Production reported from surface down to about 250 feet (Elevatorski, 1971).
Authors Joshua M. Rosera.
New data needs Detailed geologic mapping, geophysics.
Geologic mapping and modeling needs Detailed geologic mapping.
Geophysical survey and modeling needs High resolution Rank 1 aeromagnetic and aeroradiometric coverage.
Digital elevation data needs Lidar inadequate.