|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||B-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The prospect is located in the SE1/4 section 10, T. 2 N., R. 9 E., of the Seward Meridian, at or near sea level. It is on the northeast shore of Copper Bay, Knight Island. This is location 111 of Cobb and Richter (1972), location 139 of MacKevett and Holloway (1977), locations 234-235 of Cobb and Tysdal (1980), and location S-45 of Jansons and others (1984). This location is accurate to within a quarter of a mile.|
Geologic descriptionThe prospect consists of a shear zones in pillow basalt of the Orca Group of early Tertiary age (Nelson and others, 1985). The shear zones are healed by quartz and epidote. Sulfide minerals occur in numerous quartz veins in shear zones, and they slightly impregnate the adjacent country rock (Johnson, 1918 [B 662-C, p. 218]). Pyrrhotite is the dominant sulfide mineral, and traces of chalcopyrite and pyrite are also present. A random chip sample of pillow basalt with sulfide minerals, quartz, and epidote, contained 18 ppm copper and 99 ppm zinc (Kurtak and Jeske, 1986). No other information is available from the literature.
|Geologic map unit||(-147.862977811584, 60.2723463919075)|
|Mineral deposit model||Cyprus massive sulfide (Cox and Singer, 1986; model 24a)|
|Mineral deposit model number||24a|
|Age of mineralization||Tertiary or younger; the occurrence is in rocks of the Orca Group of Tertiary age.|
|Alteration of deposit||Basalt altered to epidote.|
|Workings or exploration||Johnson (1918 [B 662-C, p. 218]) reported a cabin and a shallow shaft near the high tide line, but he provided no details. Kurtak and Jeske (1986) could not find any signs of workings when they visited the prospect during the 1980-84 field seasons. A grab sample from this area contained 18 ppm copper and 99 ppm zinc (Kurtak and Jeske, 1986).|
|Indication of production||None|
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.
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., 1918, Copper deposits of the Latouche and Knight Island districts, Prince William Sound: U.S. Geological Survey BuIletin 662-C, p. 193-220.
Kurtak, J.M., and Jeske, R.E., 1986, Mineral investigations in the Chugach National Forest, Alaska (Islands area): U.S. Bureau of Mines Open-File Report 54-86, 302 p., 1 sheet, scale 1:63,360.
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.
Martin, G.C., Johnson, B.L., and Grant, U.S., 1915, Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, 243 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.
|Reporters||Jeff A. Huber and Carol S. Huber (Anchorage)|
|Last report date||3/1/2001|