Central Wasatch Mountains: record SW5334

Region	West, Southwest
States	Utah
Mineral systems	Porphyry Cu-Mo-Au
Deposit types	High sulfidation gold-silver Polymetallic sulfide S-R-V-IS Porphyry/skarn copper
Commodities	cadmium copper gold lead molybdenum silver uranium
Critical minerals	zinc
Other minerals	antimony arsenic bismuth cobalt gallium germanium indium manganese PGE rhenium scandium tellurium tin tungsten zinc

Information leading to the delineation of this focus area

Basis for focus area	Mining districts in central Wasatch Mountains including Park City, Big and Little Cottonwood, American Fork, and White Pine from Krahulec (2018b).
Identified resources	Identified resources of molybdenum, silver, and zinc. Historical production of copper, gold, lead, silver, and zinc.
Production	Park City district (1875-1978): 16,721,723 tons ore containing 1,453,867 oz Au, 253,344,128 oz Ag, 2,708,146,385 lbs Pb, 1,487,843,818 lbs Zn, and 128,967,698 lbs Cu (John, 2006); Cottonwood districts 1867-1976): ~830,023 tons ore containing 30,609 oz Au, 17,476,243 oz Ag, 18,110,308 lbs Cu, 251,811,521 lbs Pb, and 24,487,428 lbs Zn (James, 1979); American Fork district: ~175,000 tons ore at >500 ppm Ag, 9 ppm Au, 11% Pb, 2.6% Zn, and 1% Cu (Krahulec, 2018b).
Status	Past mining.
Estimated resources	Ontario mine 1980 reserves: 1,328,000 tons @ 4.5 opt Ag, 5.9% Pb, 9.2% Zn; White Pine Fork Mo deposit: 16 million tons @ 0.1% MoS2 resources.
Geologic maps	Bryant and Nichols (1990), scale 1:100,000; Bromfield and others (1981), scale 1:48,000; Calkins and others (1943), scale 1:25,000; Baker and others (1966), scale 1:24,000; Bromfield and others (1970), scale 1:24,000; Bromfield and Crittenden (1971), scale 1:24,000; Crittenden (1965a, b), scale 1:24,000; Crittenden and others (1966), scale 1:24,000; James (1979), scale 1:24,000.
Geophysical data	Inadequate Rank 4 aeromagnetic coverage.
Favorable rocks and structures	Eocene-Oligocene granitic plutons and hypabyssal intrusions, Proterozoic to Jurassic sedimentary rocks (mostly carbonates, shales, and quartzites), Eocene-Oligocene volcanic rocks on east side of focus area (Elkhorn district).
Deposits	Park City district (Ag, Pg, Zn, Cu, Au): Ontario, Silver King, Daly, Daly West and Judge, Park Utah, Park City Consolidated, Mayflower; Big and Little Cottonwood districts (Ag, Au, Pb): Emma, Flagstaff.
Evidence from mineral occurrences	MRDS; UMOS (Utah Geological Survey, 2021).
Geochemical evidence	Zinc produced from most deposits in focus area. Ore samples from Big Cottonwood district locally have high As contents (James, 1979). No data on other critical minerals.
Geophysical evidence	Unknown.
Evidence from other sources	See Krahulec (2018b).
Comments	Park Premier porphyry Cu-Au system in Elkhorn district largely covered by Jordanelle Reservoir.
Cover thickness and description	No significant cover.
Authors	David A. John.
New data needs	Digitization and synthesis of existing maps to identify gaps.
Geologic mapping and modeling needs	Digitization and synthesis of existing maps to identify gaps.
Geophysical survey and modeling needs	None requested at this time.
Digital elevation data needs	Lidar complete over all but northwestern portion of the focus area. Small areas of inadequate lidar in eastern portion.