Unnamed Occurrence (ARDF - MH076; south of upper Sevenmile Lake), Valdez Creek Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MH076; south of upper Sevenmile Lake)	- not defined -
Valdez Creek Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is at an elevation of about 4,400 feet, a quarter-mile south of upper Sevenmile Lake. It is in the center of the S1/2SE1/4 section 16, T. 20 S., R. 8 E., Fairbanks Meridian.
Geology: This occurrence is in Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991), which was mapped as Boulder Creek volcanics by Stout (1976). The deposit consists of quartz-epidote-calcite veins that contain pyrite, chalcopyrite, bornite, and secondary azurite and malachite. The veins range from less than an inch to about 1 foot thick and occupy steep north- to northeast-trending faults and joints that cut and are not deformed by the Amphitheater syncline (Stout, 1976). The deposit was not sampled; silver is typically present in the copper deposits of the Nikolai Greenstone.
Workings: There are no significant workings at the site.
Age: The quartz veins are localized in north-northeast-trending faults and joints that cut across the folded limbs of the Amphitheater syncline. They post-date the folding, which is of Jurassic age, and are probably either Cretaceous, related to regional metamorphism and granitic plutonism (Nokleberg and others, 1986; Kurtak and others, 1992), or early Tertiary (Stout, 1976).

Commodities (Major) - Ag, Cu
Development Status: None
Deposit Model: Basaltic Cu (Cox and Singer, 1986; model 23).

Other Databases

Link to USGS - Alaska:	MH076

Other Regions, Features and Areas containing this locality

References