Robin Red Breast

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals gold; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-7
Latitude 60.8401
Longitude -149.5053
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the SW1/4 section 29, T. 9 N., R. 1 W., of the Seward Meridian, at an elevation of 2,400 feet. It is situated 800 feet east of the Kenai Star mine (SR022) on Coeur d'Alene Creek. This is location 8 of Cobb and Richter (1972), location 7 of MacKevett and Holloway (1977), location 16 of Cobb and Tysdal (1980), and location S-295 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

This deposit consists of a 10-foot zone of 1- to 6-inch-thick quartz stringers in schistose slate of the Valdez Group of Late Cretaceous age (Tuck, 1933; Nelson and others, 1985). The quartz stringers form about 30 percent of the 10-foot zone, which is parallel to the cleavage of the slate (Tuck, 1933). The quartz stringer zone is exposed in an open cut. About 70 feet west of the open cut is a small exposure showing a one-foot-thick quartz vein that parallels the cleavage of the country rock. A small amount of pyrite is visible.
Geologic map unit (-149.507466428441, 60.8395357394727)
Mineral deposit model Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the veins cut rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration
The workings on this prospect consist of a several open cuts. From 1920 to 1923, some underground work was done, but those workings were not accessible when Tuck (1933) visited the prospect. Tuck collected two channel samples across the quartz stringers, but the samples assayed only a trace of gold and silver. He also sampled the 1-foot-wide vein, but it also only assayed a trace of gold and silver. Tuck concluded that the small width, low tenor, and lack of persistence along strike indicated that the vein had little value.
The U.S. Bureau of Mines visited the prospect in the early 1980s, but they collected no samples (Hoekzema and Sherman, 1983).
Indication of production None

References

References

Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Mitchell, P.A., 1979, Geology of the Hope-Sunrise (gold) mining district, north-central Kenai Peninsula, Alaska: Stanford University Master of Science thesis, 123 p.
Reporters Jeff A. Huber (Anchorage)
Last report date 2/20/2000