The Dome Prospect, Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
The Dome Prospect	Prospect
Chistochina Mining District	Mining District
Valdez-Cordova Census Area	Census Area
Alaska	State
USA	Country

Location: The prospect is on the top and on the north side of The Dome, a prominent isolated mountain on the west side of Ahtell Creek. The prospect is in the SE1/4NW1/4, section 22, T. 12 N., R. 7 E., Copper River Meridian. The prospect is correctly located as number 3 on figure 5 of Richter (1966). It was mislocated by 1.2 miles as locality 7 of Richter and Matson (1972).
Geology: The Dome prospect consists of veins and disseminated ore minerals in hornfelsed flows and possibly interbedded tuffs of the Pennsylvanian, Slana Spur Formation and in intrusive rocks of the Pennsylvanian to Permian, Ahtell Pluton (Richter, 1966; Richter, Lanphere, and Matson 1975; and Beard and Barker, 1989). The silicic border phase of the Ahtell pluton contains stockworks of weakly metalliferous, quartz-calcite veins. The veins are as much as one foot thick and occupy joint sets. The predominant joint set strikes slightly west of north and dips moderately to the west. The veins contain sparse disseminated pyrite, chalcopyrite, and galena. The volcanic rocks also contain limonitic, hornfelsed volcanic rocks; the limonite probably formed by the oxidation of pyrite and chalcopyrite. A composite sample of an area about 400 feet by 100 feet in size contained from 0.05 to 0.1 percent copper (Richter, 1966, p. 31).
Workings: Mineral deposits exposed in shallow pits (Richter, 1964, 1966).
Age: Emplaced subseqent to or is related to the border phase of the Pennsylvanian to Permian, Ahtell pluton.
Alteration: Quartz-sericite-pyrite alteration of the intrusive rocks is present on the northeast side of The Dome.

Commodities (Major) - Cu, Pb
Development Status: None
Deposit Model: Porphyry Cu (Cox and Singer, 1986; model 17)

Other Databases

Link to USGS - Alaska:	GU024

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References