| 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. |
