Unnamed (east of lower Jay Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Au; W
Ore minerals bornite; pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale D-2
Latitude 62.8061
Longitude -147.8079
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,150 feet on the southeast, valley wall of Jay Creek, about 3 miles northeast of its mouth on the Susitna River. The occurrence is near the center of the NW1/4 sec. 5, T. 31 N., R. 9 E., Seward Meridian. The location is accurate to within 1/8 mile. This is locality B33 of Kurtak and others (1992).

Geologic setting

Geologic description

This deposit at this prospect consists of randomly oriented, pyrite-, pyrrhotite-, and bornite-bearing shear zones up to 7 feet wide, in andesitic metavolcanic rocks (Kurtak and others, 1992). The shear zones are exposed for about 50 feet. Samples of iron-stained rock collected by the U.S. Bureau of Mines contain up to 104 parts per million copper, 25 parts per billion gold, and 80 parts per million tungsten (Kurtak and others, 1992).
Geologic map unit (-147.810132131711, 62.8056398602199)
Mineral deposit model Porphyry Cu-Au? (Cox and Singer, 1986; model 20c?)
Mineral deposit model number 20c?
Alteration of deposit Silicification and iron staining in the shear zones (Kurtak and others, 1992).

Production and reserves

Workings or exploration Only sampling by the U.S. Bureau of Mines (Kurtak and others, 1992).
Indication of production None

Additional comments

MAS/MILS number 20760093.

References