Gold Hill; Su Prospect, Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Gold Hill; Su Prospect	Prospect
Valdez Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

Location: The Gold Hill (Su) prospect is at an elevation of about 4,800 feet, at the crest of the ridge northwest of the junction of Wickersham Creek and Butte Creek. The map site is near the north end of the boundary between secs. 15 and 16, T. 21 S., R. 1 W., of the Fairbanks Meridian. The location is accurate to within 1,000 feet. This is locality 8 of Smith and others (1975: OFR 69); locality B7 of Balen (1990: OFR 34-90).
Geology: The area of this prospect is underlain by intensely deformed and metamorphosed Lower Cretaceous and Upper Jurassic flysch (Wilson and others, 1998), cut by altered Lower Tertiary to Upper Cretaceous(?) diorite and quartz monzonite (Smith and others, 1988). The deposit consists of widely-spaced zones of sulfide minerals disseminated in the metasedimentary and altered intrusive rocks, and of stockwork quartz veinlets that carry molybdenite, chalcopyrite, pyrite, and sericite. Samples containing as much as 0.39 ounce of gold per ton have been reported (Balen and others, 1991).
Workings: Exploration has included soil sampling and trenching over a broad area. At least 2 shallow drill holes totalling 220 feet, were completed in the 1970s. Since then, at least 30 holes have been drilled on the prospect (D.L. Stevens, oral communication, 1999). Geophysical exploration has included a regional aeromagnetic survey over the prospect and surrounding area, as well as ground magnetics, IP, and EM. Samples containing as much as 0.39 ounce of gold per ton have been reported (Balen and others, 1991).
Age: Probably Late Cretaceous or younger.
Alteration: Phyllic and propyllitic.

Commodities (Major) - Au, Cu; (Minor) - Mo
Development Status: None
Deposit Model: Porphyry Cu-Au (Cox and Singer, 1986; model 20c)

Other Databases

Link to USGS - Alaska:	HE172

Other Regions, Features and Areas containing this locality

References