Mogollon-Wilcox-Gila fluorite districts

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

Information leading to the delineation of this focus area

Basis for focus area Historically productive fluorite districts located along the western rim of Mogollon mountains. Western boundary defined by major basin-bounding fault. Fluorite mineralization often replaces and cuts dacite and rhyolite dikes that post-date major late Eocene-Oligocene volcanic eruptions. Focus area drawn to include Mogollon, Wilcox, and Gila districts. Shape of focus area broadly follows extensional faults and associated dikes.
Identified resources Historical production of fluorite and manganese in Mogollon, Wilcox, and Gila districts.
Production Clum: ~ 23,000 tons of 52 to 70% CaF2 produced; Gold Spar mine: ~ 850 tons; Rainbow: ~ 250 tons; Wilcox district: 10,603 tons fluorite and 87 long tons Mn; Gila district: 47,586 tons fluorite.
Status Past mining and current exploration in Mogollon district for Au and Ag.
Estimated resources Huckleberry Mine: 38,000 metric tons of 30% CaF2 Indicated + 45,000 tons probable (McAnulty, 1978); Gold Spar mine vein sample: 64% CaF2, 5.1% MnO.
Geologic maps Ratte (1977, 1981), scale 1;24,000; Ratte and others (2006), scale 1:24,000; Ratte and others (1979), scale 1:200,000.
Geophysical data Inadequate Rank 4 aeromagnetic and Rank 5 aeroradiometric coverage.
Favorable rocks and structures Faults and splays associated with basin and range extension along the west/southwest margin of the Mogollon mountains. Mineralization spatially associated with rhyolite dikes that are younger than main phases of magmatism in the Mogollon-Datil volcanic field, but their genetic association is unclear.
Deposits Mogollon, Wilcox, Gila districts: Blue Rock (MRDS dep_id: 10013008), Gold Spar (MRDS dep_id: 10013281), Huckleberry (MRDS dep_id: 10013491), Sacaton (MRDS dep_id: 10097846), Rainbow (MRDS dep_id: 10101825).
Evidence from mineral occurrences MRDS; New Mexico Mines Database (McLemore and others, 2005).
Geochemical evidence Few occurrences of anomalously high Mo, Sn, Ag, and Au in streambed sediments (Ratte and others, 1979).
Geophysical evidence Unknown.
Evidence from other sources New Mexico Mining and Minerals Division mine permits.
Comments Some of the Mogollon district is located in a Wilderness area.
Cover thickness and description Potential for buried or eroded deposits in fault-bounded basin.
Authors Joshua M. Rosera, Virginia T. McLemore.
New data needs Geophysics, geologic mapping.
Geologic mapping and modeling needs Canteen Canyon and Canyon Hill 1:24,000 scale quadrangles. Rice Ranch quad, need detailed 1:12000 mapping in specific areas.
Geophysical survey and modeling needs High resolution aeromagnetic and aeroradiometric coverage.
Digital elevation data needs Lidar complete.