Tonto Fluorspar

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

Information leading to the delineation of this focus area

Basis for focus area Extent of known mineralization.
Identified resources Identified fluorite resources; historical fluorite production.
Production 22,679 tonnes of ore were mined at McFadden Peak for testing only, with results unknown (Sawyer and others, 1992).
Status Past mining.
Estimated resources Quartz Ledge/White Cow: 35,850 tons @ >50% CaF2 (Arizona Department of Mines and Mineral Resources files-ADDMR); Packard/Bluebird: 118,205 tons @ >50% CaF2 (ADDMR); Redrock: 105,455 @ >50% CaF2 (ADDMR); McFadden Peak: historical Indicated resource of 450,000 tons @ 65% CaF2 (ADDMR).
Geologic maps Bergquist and others (1981), scale 1:48,000; Skotnicki (1999b), scale 1:24,000; Spencer and others (1999), scale 1:24,000; Skotnicki (2002), scale 1:100,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures All deposits occupy steep veins, with each deposit having different strikes. Packard is hosted in metamorphosed rhyolite of the lowermost Apache Group and a Precambrian granite. Quartz Ledge is hosted within a granite of presumably Precambrian age. Red Rock is hosted within a quartzite.
Deposits Quartz Ledge (White Cow) (MRDS dep_id: 10209714), Packard mine (Bluebird mine) (MRDS dep_id: 10046361) McFadden Peak (MRDS dep_id: 10056467), Red Rock mine (MRDS dep_id: 10056466).
Evidence from mineral occurrences MRDS.
Geochemical evidence Unknown.
Geophysical evidence No data known.
Evidence from other sources None.
Comments Several small high-grade, low-tonnage deposits in area. Much of the area has not been mapped at a scale larger than 1:100,000 (including Red Rock and McFadden Peak).
Cover thickness and description Surface exposures of mineralization at each mine, but bulk of resource follows vein system to depth. Vein widths vary between 1.1-12.9 feet (Pincock, Allen and Holt, Inc., 1978, 1979).
Authors Carson A. Richardson, Joshua M. Rosera.
New data needs Detailed geologic mapping.
Geologic mapping and modeling needs Detailed geologic mapping.
Geophysical survey and modeling needs Perhaps aeromagnetic survey could be of use, but most vein fluorite deposits have been more successfully explored via electromagnetic or magnetotelluric surveys.
Digital elevation data needs Lidar mostly inadequate.