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 tellurium in the Wilcox district.
Production Lone Pine mine (Wilcox district) produced 5 tons of Te from Au-Te epithermal veins (McLemore, 2016).
Status Past mining and current exploration in Mogollon district for Au and Ag.
Estimated resources Unknown.
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 Lone Pine mine (MRDS dep_id: 10174446).
Evidence from mineral occurrences MRDS; New Mexico Mines Database (McLemore and others, 2005).
Geochemical evidence Primary mineralization consists of pyrite, fluorite, native tellurium, molybdenite and gold-tellurides. A vertical zonation is apparent with pyrite stratigraphically lowest, grading into a pyrite-tellurium assemblage, followed by a fluorite-rich zone at the highest elevations. Gold-tellurides are found with gold, silver, pyrite, and fluorite in fracture-filling veins in rhyolite at Lone Pine, with reported assays as much as 5,000 ppm Te (McLemore, 2016).
Geophysical evidence Unknown.
Evidence from other sources Unknown.
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, Jane M. Hammarstrom.
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.