|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The prospect is located in the SW1/4 section 2, T. 4 N., R. 10 E., of the Seward Meridian. It is located on the south end of Louis Bay, 4 to 15 feet above sea level. This is location 198 of Tysdal (1978 [MF-880-A]) and location S-82 of Jansons and others (1984). This location is accurate to within a quarter of a mile.|
The prospect consists of three shear zones that strike N 50 E and dip 65-75 S. The shear zones cut greenstone and are cemented by quartz-epidote-sulfide veins (Kurtak and Jeske, 1986). The greenstone is part of the Orca Group of early Tertiary age (Nelson and others, 1985). Two 10-foot-long adits are driven on two of the shear zones, which are about 20 feet apart. An 14-foot-long open cut follows the third shear zone.The southernmost adit follows a 2- to 8-inch-wide quartz vein for 15 feet. The vein contains epidote, pyrite, and a small amount of chalcopyrite. The north adit follows a 6- to 8-inch-wide breccia zone for 12 feet. It contains chalcopyrite, malachite, and pyrite. The open cut exposes a 6-inch-wide breccia zone that is cemented by quartz, pyrite, and chalcopyrite. The hanging wall of this zone is silicified for about 2 feet. Random chip samples collected from the adits and surface exposures contained from 200 ppm to 1.9 percent copper and from 0.3 to 6.3 ppm silver. The random chip sample containing 1.9 percent copper was from greenstone breccia with quartz epidote veins and visible chalcopyrite and a trace of malachite. (Kurtak and Jeske, 1986).
|Geologic map unit||(-147.675799032408, 60.4596968150887)|
|Mineral deposit model||Cyprus massive sulfide (Cox and Singer, 1986; model 24a)|
|Mineral deposit model number||24a|
|Age of mineralization||Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.|
|Alteration of deposit||Silicification and epidotization are reported, but no details are provided (Kurtak and Jeske, 1986).|
|Workings or exploration||Workings on the prospect consist of two 10-foot adits and a 14-foot open cut. Samples collected from the adits and the open cut by the U.S. Bureau of Mines contained between 200 ppm and 1.9 percent copper. The random chip sample containing 1.9 percent copper was from greenstone breccia with quartz epidote veins and visible chalcopyrite with a trace of malachite (Kurtak and Jeske, 1986).|
|Indication of production||None|
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.
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||12/15/2000|