East Vein Prospect, Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
East Vein Prospect	Prospect
Valdez Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

Location: The East Vein prospect is at an elevation of about 3,400 feet in and adjacent to Bryn Mawr Creek. The site is in sec. 3, T. 20 S., R. 11 W., of the Fairbanks Meridian. The location is accurate to within 400 feet.
Geology: The country rocks at the East Vein prospect are hornfelsed Triassic red-bed sedimentary strata. The depositis a quartz stringer lode that strikes N30E, dips steeply to the northwest, and has a strike length of over 1,000 feet. The lode ranges from 1 to 3 feet wide and contains discontinuous pods of arsenopyrite, chalcopyrite, galena, pyrite, and sphalerite. In Bryn Mawr Creek the vein contains up to 80% sulfides. Inplaces, the vein is in gradational contact with country rock. Sulfide composition varies over short distances from arsenopyrite-rich to galena-sphalerite-rich zones. Vein samples assayed 0.01-0.90 ounce of gold per ton, 1.2-8.5 ounces of silver per ton, 0.15-0.73% copper, up to 1.8% lead, and up to 17% zinc (Mulligan and others, 1967). The East Vein prospect is about 500 feet east-northeast of the Golden Zone mine (HE043), and probably is an extension of that deposit.
Workings: All surface exploration. Vein samples assayed 0.01-0.90 ounce of gold per ton, 1.2-8.5 ounces of silver per ton, 0.15-0.73% copper, up to 1.8% lead, and up to 17% zinc (Mulligan and others, 1967).
Age: Probably Late Cretaceous.
Alteration: The alteration is probably similar to that described for the adjacent Golden Zone and BLT, which consists of sericite, ankerite and quartz.

Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c)

Other Databases

Link to USGS - Alaska:	HE041

Other Regions, Features and Areas containing this locality

References