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North Star

Prospect, Inactive

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Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale C-8
Latitude 60.6209
Longitude -149.6584
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the SE1/4 section 8, T. 6 N., R. 2 W., of the Seward Meridian, at elevations between 4,200 and 4,400 feet. The site is about 2.2 miles east-northeast of Devils Pass. This is location 95 of Condon and Cass (1958), location 82 of Cobb and Richter (1972), location 94 of MacKevett and Holloway (1977), location 147 of Cobb and Tysdal (1980), and location S-258 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The deposit at the North Star prospect consists of a vuggy, milky-white quartz vein (Hoekzema and Sherman, 1983). The vein, as exposed 200 feet above the portal of an adit, strikes N5E and dips 60NW, roughly parallel to the foliation of the Valdez Group (Late Cretaceous age) slate host rock (Nelson and others, 1985). The rock at the portal is blocky graywacke that breaks into brick- and flagstone-like fragments (Hoekzema and Sherman, 1983).
Geologic map unit (-149.660567595776, 60.6203371309767)
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; the vein cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration A trail leads to a caved adit (Jansons and others, 1984). The U.S. Bureau of Mines collected surface samples in 1979. A grab sample contained trace amounts of gold and silver. A 6-inch-long chip sample assayed 0.08 ounce of gold per ton and a trace of silver (Jansons, 1981).
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.
Jansons, Uldis, 1981, 1979 Bureau of Mines sample sites and analytical results for samples collected in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Open File Report 83-81, 229 p. 5 sheets.
Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000.
Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.
Reporters Jeff A. Huber (Anchorage)
Last report date 1/22/2000