The geology of, and known mineral occurrences within, Wilderness Study Area 4-8 Jackson Mountain - Black Rock

Calder, S.R.; Reynolds, S.J.

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Calder, S.R., Reynolds, S.J., 1983, The geology of, and known mineral occurrences within, Wilderness Study Area 4-8 Jackson Mountain - Black Rock. Arizona Geological Survey Open file Report, OFR-83-07, 30 p.

Description

The WSA is underlain by Precambrian metamorphic rocks, Cretaceous or Tertiary granite, and middle Tertiary volcanics. Bedrock exposures are surrounded by late Tertiary-Quaternary basin-fill (sands, gravels, etc.). Three major fault systems Two groups of inactive prospects are located within the WSA; botll are situated on the northern flanks of Jackson Mountain. The Spar Fluorite Group, largest mining operation in this area, produced 1200 tons of fluorspar prior to 1953; no further activity has been reported. Minor occurrences of secondary copper, lead, silver, and zinc minerals are associated with ftuorspar; however, no significant production of these ores has been recorded. No information concerning development, mineral commodities, or production is available for the second group of prospects within the WSA; Fluorspar also occurs to the south of the WSA in Precambrian schist. Several prospect pits were located in this area. Records of production are unavailable; There are reports of uranium radioactivity from five exploration prospects to the north and south of the WSA. No uranium production has been recorded from the Jackson Mountain region; There are several copper occurrences in granitic rocks located in the south-central portion of the massive Tertiary granitic batholith to the northwest of Jackson Mountain. Minor amounts of lead, silver, and gold are associated with the copper deposits; The Stanley-Aravaipa Mining District, to the west of the WSA, has been actively mined and prospected since the late 1800's. Lead, zinc, and silver deposits are contained in Precambrian metamorphosed igneous and sedimentary formations, Paleozoic sediments, Cretaceous or Tertiary granitic rocks, and middle Tertiary volcanics.

URI

http://hdl.handle.net/10150/629350

Additional Links

https://library.azgs.arizona.edu/

Language

Series/Report no.

OFR-83-07

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Collection Information

Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.

North Bounding Coordinate

33.2647

South Bounding Coordinate

32.9195

West Bounding Coordinate

-109.82

East Bounding Coordinate

-109.364

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AZGS Document Repository