|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The prospect is located on the east side of Glacier Island about a mile south of Finski Point. It is in the W1/2 section 30, T. 11 S., R. 10 W., of the Copper River Meridian. This is location 189 of Tysdal (1978 [MF-880-A]) and location S-108 of Jansons and others (1984). This location is accurate to within half a mile.|
Geologic descriptionThe prospect consists of several showings of shattered Orca Group (of Tertiary age) greenstone cemented by quartz and epidote containing pyrite and chalcopyrite in what appears to be a single shear zone in a pronounced gully. The shear zone strikes N5W and dips 65W (Cobb and Tysdal, 1980). The shear zone averages 4 feet in width; most of the mineralized portion is from 5 to 12 inches wide. One body of solid cupiferous pyrite in the zone is 10 feet wide and of unknown length. Another mineralized zone consists of a streak of solid chalcopyrite along the hanging wall of the shear. This zone is 3 inches thick; its length is unknown (Tuck, 1933).
|Geologic map unit||(-147.082241206846, 60.888059752026)|
|Mineral deposit model||Besshi massive sulfide (Cox and Singer, 1986; model 24b)|
|Mineral deposit model number||24b|
|Age of mineralization||Tertiary or younger; the veins cut Orca Group rocks of Tertiary age.|
|Alteration of deposit||Basalt altered to greenstone.|
|Workings or exploration||There are three adits on the prospect. Two are located at 250 feet and one at 500 feet elevation. One of the lower adits has 225 feet of workings, and the other has 30 feet of workings. The upper adit is 30 feet long. There is also some surface trenching . Assays show traces of gold and silver (Tuck, 1933).|
|Indication of production||None|
Additional commentsThere are considerable workings on this prospect, considering there has been no production.
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.
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.
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.
|Reporters||Jeff A. Huber (Anchorage)|
|Last report date||3/9/2000|