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Mighty

Prospect, Inactive

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Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-7
Latitude 60.8815
Longitude -149.5378
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the SE1/4 section 12, T. 9 N., R. 2 W., of the Seward Meridian. It is at an elevation of 2,600 feet, and 1,000 feet N70W from the turn at the head of Bear Creek. This is location 11 of Tysdal (1978 [MF-880-A]) and location S-300 of Jansons and others (1984). The location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The deposit consists of auriferous, sulfide-bearing, quartz veins that heal fractures in an Eocene(?) felsic dike. The veins are highly irregular, range to as much as 1 foot wide, and contain pyrite and arsenopyrite (Jansons and others, 1984). The dike generally strikes N15W and dips 55W (Hoekzema and Sherman, 1983) and also contains pyrite and arsenopyrite. The country rock is siltstone (Tysdal, 1978 [MF-880-A]) of the Valdez Group of Late Cretaceous age (Nelson and others, 1985).
Geologic map unit (-149.539973196088, 60.8809386285884)
Mineral deposit model Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Eocene or younger, the probable age of the dike host rock.

Production and reserves

Workings or exploration The workings on this prospect consist of a single adit that is 90 feet long. The adit was mapped and sampled in 1982 by the U.S. Bureau of Mines (Hoekzema and Sherman, 1983). Three chip samples assayed only trace amount of gold and less than 0.05 ounce of silver per ton. A grab sample of dump material assayed 0.05 ounce of gold per ton and 0.03 ounce of silver per ton. There is no reported production.
Indication of production None

References

References

Cobb, E.H., and Richter, D.H., 1972, Metallic mineral resources map of the Seward quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-466, 2 sheets, scale 1:250,000.
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, 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.
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.
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 2/21/2000