|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 a stream gully below lake 925 at an elevation between 830 and 860 feet. This is in the SW1/4 section 6, T. 2 N., R. 10 E., of the Seward Meridian. This is location 231 of Tysdal (1978 [MF-880-A]) and location S-49 of Jansons and others (1984). This location is accurate to within 300 feet.|
The prospect is hosted in a moderately sheared, medium-grained greenstone lens within fine-grained greenstone and finely laminated, tuffaceous sedimentary rock. Nelson and others (1985) identified the greenstone as Orca Group of early Tertiary age. Several shear zones, as much as 10 feet wide, cut the greenstone. They are part of a larger shear zone system that trends north-northeast and dips nearly vertically. This system is about half a mile wide and 5 miles long (Nelson and others, 1985). Chalcopyrite and pyrrhotite occur as blebs in a basalt dike and within quartz-epidote veins. The relationship between shearing and mineralization is unclear. Sulfide minerals are found in numerous quartz veins in shears zones and impregnating the country rock (Cobb and Tysdal, 1980). Pyrrhotite is the dominant sulfide; traces of chalcopyrite and pyrite are also present.Two adits were driven along shear zones; the 10-foot-long south adit is at an elevation of 860 feet, and the 63-foot-long north adit is at an elevation of 830 feet. The U.S. Bureau of Mines collected a total of nine samples, seven from the adits and two from within 80 feet east of the south adit. They contained between 75 ppm and 0.24 percent copper and as much as 0.7 percent nickel Kurtak and Jeske, 1986).
|Geologic map unit||(-147.789364210194, 60.288742723614)|
|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.|
|Workings or exploration||The workings on the prospect consist of two short adits. The lower (south) adit is at an elevation of 830 feet and follows a south-trending shear zone for a distance of 10 feet. The 63-foot-long upper (north) adit is at an elevation of 860 feet and strikes N23E. The U.S. Bureau of Mines collected seven samples from the adits and two from within 80 feet east of the south adit. They contained between 75 ppm and 0.24 percent copper and as much as 0.7 percent nickel (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.
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.
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||11/9/2001|