Summit Vein

Prospect, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale C-7
Latitude 60.6146
Longitude -149.5647
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the NE1/4 section 14, T. 6 N., R. 2 W., of the Seward Meridian, at an elevation of 3,400 feet. It is situated along the north side and near the crest of the divide between Slate and Summit Creeks about 1.25 miles west of the Seward Highway. This is location S-254 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The deposit at the Summit Vein prospect consists of a quartz-carbonate vein averaging about 13 inches wide over a 235-foot strike length (Tuck, 1933). The vein strikes N30W and dips steeply to the northeast. The quartz is locally vuggy and contains galena, arsenopyrite, sphalerite, pyrite, and gold. Visible gold is present, and the crushed quartz pans considerable free gold (Jansons and others, 1984). The host rock is folded slate and graywacke (Hoekzema and Sherman, 1983) of the Valdez Group of Late Cretaceous age (Nelson and others, 1985).
The U.S. Bureau of Mines collected 10 samples from the prospect in 1980 and 1981. Grades appear to be highest on the northwest end of the vein and to diminish to the southeast. The average grade of the vein is 2.4 ounces of gold per ton and 1.6 ounces of silver per ton (Jansons and others, 1984).
Geologic map unit (-149.566851465124, 60.6140273148435)
Mineral deposit model Low-sulfide, Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; vein cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration Workings consist of trenching along the vein. There is no recorded production, but a small amount of unreported production is possible.
Indication of production None
Reserve estimates The U.S. Bureau of Mines estimated reserves at 3,400 tons of ore (Jansons and others, 1984).

Additional comments

This prospect was referred to by Tuck (1933) as the Summit Vein. Apparently this vein was prospected along with several other veins in the area during the development of the Gilpatrick Dike mine (SR136).