Unnamed (west of Jackpot Peak)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Pb; Zn
Ore minerals arsenopyrite; galena; gold; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-4
Latitude 60.3199
Longitude -148.264
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the SE1/4 section 29, T. 3 N., R. 7 E., of the Seward Meridian. It is situated at an elevation of about 770 feet on the south side of Jackpot Bay about one-quarter mile from the beach. This is location 121 of Cobb and Richter (1972), location 110 of MacKevett and Holloway (1977), location 174 of Cobb and Tysdal (1980), and location S-91 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The prospect consists of a single, 20- to 28-inch-wide, mineralized quartz vein. The center of the vein is a 6- to 11-inch-wide zone of massive to semi-massive sulfide minerals consisting of arsenopyrite, galena, pyrite, sphalerite, and gold (Grant and Higgins, 1909). The vein strikes N 52 W and dips 67 W; it is exposed for about 15 feet (Grant and Higgins, 1909). The bedrock in this area slate and graywacke of the Orca Group of early Tertiary age (Nelson and others, 1985).
An 8-foot-long open cut was driven on the vein in 1908. Six samples were collected from the open cut; three were taken across the outer part of the vein, and three were taken across the central sulfide zone. Assays of the outer quartz zone averaged 0.5 ounce of gold per ton, and the inner sulfide zone averaged 2.5 ounces of gold per ton (Grant and Higgins, 1909).
Geologic map unit (-148.266028348159, 60.3192364970634)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Tertiary or younger; the occurrence is in rocks of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration
An 8-foot-long open cut was driven on the vein in 1908. Six samples were collected from the open cut; three were taken across the outer part of the vein, and three were taken across the central sulfide zone. Assays of the outer quartz zone averaged 0.5 ounce of gold per ton, and the inner sulfide zone averaged 2.5 ounces of gold per ton (Grant and Higgins, 1909).
The U.S. Bureau of Mines visited the site in the early 1980s but failed to locate any workings. They collected a random chip sample, a grab sample of quartz float, and two stream silt samples. The highest gold value was 0.09 ppm from a stream sample (Kurtak and Jeske, 1986).
Indication of production Undetermined

References

MRDS Number A010415

References

Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 12/7/2000