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.