Unnamed (north side of Henry Creek)

Prospect, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale C-8
Latitude 60.5906
Longitude -149.6588
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the SE1/4 section 20, T. 6 N., R. 2 W., of the Seward Meridian. It is situated on the north valley wall of Henry Creek at an elevation of 4,000 feet. This is location 24 of Cobb and Richter (1972), locations 33 and 211 of MacKevett and Holloway (1977), location 48 of Cobb and Tysdal (1980), and location S-250 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

This deposit consist of arsenopyrite mineralization in a fractured felsic dike. The dike intrudes slate of the Valdez Group of Late Cretaceous age which contains arsenopyrite-bearing quartz stringers adjacent to the dike (Cobb and Tysdal, 1980). The dike strikes N30E and dips 30NW; it averages 2.5 feet thick and can be traced for 1,000 feet along strike.
Geologic map unit (-149.660963216059, 60.5900342352476)
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; mineralization is in a dike that cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration There are several prospect pits on the dike. The U.S. Bureau of Mines collected one chip sample that assayed 0.01 ounce of gold per ton, 0.08 ounce of silver per ton, and 200 ppm arsenic (Jansons and others, 1984).
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.
Reporters Jeff A. Huber (Anchorage)
Last report date 1/7/2000