|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 near tidewater on the north side of Snug Harbor, 1.5 miles northwest of Discovery Point (see the 1:250,000 quadrangle for this feature). It is in the NE1/4 section 16, T. 2 N., R. 10 E., of the Seward Meridian. This is location 241 of Tysdal (1978 [MF-880-A]) and location S-38 of Jansons and others (1984). This location is accurate to 300 feet.|
Geologic descriptionThe prospect consists of a shear zone in slate and graywacke of the Orca Group of early Tertiary age; the shear zone contains lenses of massive sulfide along with quartz veins (Nelson and others, 1985; Kurtak and Jeske, 1986). The shear zone is 3 to 5 feet wide; it trends N20E and dips steeply northwest. The surface exposure is strongly iron-stained. Sulfides consist of pyrrhotite, chalcopyrite, and sphalerite that are, along with quartz, in fractures and brecciated zones (Kurtak and Jeske, 1986). Workings on the prospect consist of a 70-foot-long adit that appears to parallel the trend of the mineralized zone for 55 feet, then crosscuts it. A single sample from the adit contained 110 ppm copper and 53 ppm zinc. An 8-foot chip sample collected from the iron-stained shear zone at the mouth of the adit contained 0.37 percent copper and 0.82 percent zinc (Kurtak and Jeske, 1986).
|Geologic map unit||(-147.720637765767, 60.2637261916545)|
|Mineral deposit model||Besshi massive sulfide (Cox and Singer, 1986; model 24b)|
|Mineral deposit model number||24b|
|Age of mineralization||Tertiary or younger; the occurrence is in rocks of the Orca Group of Tertiary age.|
|Alteration of deposit||There is considerable limonite staining in the surface exposure of the shear zone.|
|Workings or exploration||Workings on the prospect consist of a 70-foot-long adit that appears to parallel the trend of the mineralized zone for 55 feet, then crosscuts it. A single sample from the adit contained 110 ppm copper and 53 ppm zinc. An 8-foot chip sample from the iron-stained shear zone at the mouth of the adit, contained 0.37 percent copper and 0.82 percent zinc (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.
Grant, U.S., and Higgins, D.F., Jr., 1909, Notes on geology and mineral prospects in the vicinity of Seward, Kenai Peninsula: U.S. Geological Survey Bulletin 379-C, p. 98-107.
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.
Moffit, F.H., and Fellows, R.E., 1950, Coper deposits of the Prince William Sound district, Alaska: U.S. Geological Survey Bulletin 963-B, p. 47-80.
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||12/18/2001|