Reed, Gauthier, and Cooper (ARDF #SR082) Au

Reed, Gauthier, and Cooper

Prospect, Inactive

Commodities and mineralogy

Main commodities	Au
Other commodities	Cu; Zn
Ore minerals	arsenopyrite; chalcopyrite; gold; pyrite; pyrrhotite; sphalerite
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	SR
Quadrangle map, 1:63,360-scale	D-4
Latitude	60.9526
Longitude	-148.238
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	The prospect is at an elevation of less than 50 feet on the southwest shore of Hobo Bay. It is in the SE1/4 section 17, T. 10 N., R. 7 E., of the Seward Meridian. This is location 119 of Condon and Cass (1958), location 70 of Cobb and Richter (1972), location 78 of MacKevett and Holloway (1977), location 122 of Cobb and Tysdal (1980), and location S-149 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description This prospect consists of a sulfide-bearing quartz vein in a shear zone in slate of the Upper Cretaceous Valdez Group (Cobb and Tysdal, 1980). The shear zone is about 3 feet wide, striking N30E to N60E and dipping 70NW. It has been traced along the surface for about 1,500 feet (Johnson, 1915). The vein pinches and swells from 3 to 14 inches wide and contains pyrrhotite, pyrite, chalcopyrite, sphalerite, and gold. Workings on the prospect consist of a 172-foot-long crosscut and a 25-foot-long adit with a 30-foot winze (Johnson, 1915).
Geologic map unit	(-148.240076524111, 60.9520215104168)
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 is in a shear zone that cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration	Workings on the prospect consist of a 172-foot-long crosscut and a 25-foot-long adit with a 30-foot winze (Johnson, 1915).
Indication of production	None

References

MRDS Number	A010611
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. Cobb, E.H., and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p. Condon, W.H., and Cass, J.T., 1958, Map of a part of the Prince William Sound area, Alaska, showing linear geologic features as shown on aerial photographs: U.S. Geological Survey Miscellaneous Investigations Series Map I-273, 1 sheet, scale 1:125,000. 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. Johnson, B.L., 1914, The Port Wells gold-lode district, Alaska: U.S. Geological Survey Bulletin 592-G, p. 195-236. Johnson, B.L., 1915, Mining on Prince William Sound: U.S. Geological Survey Bulletin 622-E, p. 131-139. MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000. 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	3/7/2000