Cooks Range-Fluorite Ridge fluorite-manganese

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

Information leading to the delineation of this focus area

Basis for focus area Study area includes normal faults associated with basin & range extension that bound the western side of Cooke's range. Historical mining in the Fluorite Ridge district is located along a northwest-trending normal fault. To the north, fluorite mines are associated with a northeast striking normal fault. The focus area was drawn with an approximate 2 km buffer along the footwall of these two faults to include Cookes Peak, Northern Cooks Range, Old Hadley and Fluorite Ridge districts.
Identified resources Identified resources for fluorite; historical production of fluorite and manganese.
Production Estimated 94,279 tons fluorite produced in Fluorite Ridge and Cooks Peak district (McAnulty, 1978). Small manganese production from Stareky (Ruth) mine in Cooks Range manganese district.
Status Past mining.
Estimated resources White Eagle vein (northern part of focus area): approximately 80,000 tons of 60% CaF2 proven and another 56,000 tons of 40% CaF2 probable.
Geologic maps Clemons (1982), scale 1:24,000.
Geophysical data Inadequate Rank 4 or 5 aeromagnetic and Rank 5 aeroradiometric coverage.
Favorable rocks and structures Normal faults, especially near monzonite-conglomerate contact in the footwall. Monzonite is cut by ~ 37 Ma rhyolite dikes, which in turn are cut by fluorite mineralization.
Deposits Fluorite: Greenleaf mine (MRDS dep_id: 10150247), Grattan mine (MRDS dep_id: 10151121), Green Spar (MRDS dep_id: 10013936), Sadler mine (MRDS dep_id: 10069413), White Eagle mine (MRDS dep_id: 10069411); Manganese: Doubtful Group (MRDS dep_id: 10062659), Starkey (MRDS dep_id: 10014012).
Evidence from mineral occurrences MRDS; New Mexico Mines Database (McLemore and others, 2005).
Geochemical evidence Unknown.
Geophysical evidence Unknown.
Evidence from other sources Fluorite + manganese association in close proximity to young rhyolite dikes and Basin and Range-style faulting throughout region.
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 Mostly covered by the Massacre Peak 1:24,000 map. Northwest part of study area (Goat Ridge quadrangle) is not mapped.
Geophysical survey and modeling needs High resolution aeromagnetic and aeroradiometric coverage.
Digital elevation data needs Lidar complete.