|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 mine is located on the southeast shore of Drier Bay about half a mile southwest of Barnes Cove at an elevation of about 500 feet. This is in the NE1/4 section 31, T. 3 N., R. 10 E., of the Seward Meridian. This is location 230 of Cobb and Tysdal (1980) and location S-50 of Jansons and others (1984). This location is accurate to within a quarter of a mile.|
Geologic descriptionAccording to Kurtak and Jeske (1986), the mine workings expose an iron-stained shear zone that trends N15W and dips 40 to 80 NW. It averages 4 feet in width. The host rock is sheared greenstone that exhibits various degrees of chloritization (Kurtak and Jeske, 1986). Nelson and others (1985) mapped this area as Orca Group of early Tertiary age. Massive sulfide lenses composed mainly of pyrrhotite and chalcopyrite as much as 6 inches thick occur throughout the greenstone. They can be traced for about 240 feet along strike (Kurtak and Jeske, 1986). Other minor sulfide minerals include cubanite, covellite, and sphalerite. A 60-foot-long adit at 518 feet elevation was driven S10E along the shear zone. Massive sulfide mineralization consisting mostly of pyrrhotite with some chalcopyrite occurs along both the hanging wall and footwall. Samples from this zone contained from 280 ppm to 13 percent copper along with trace amounts of silver and gold. Samples from the open cut at 453 feet elevation contained 0.15 percent to 1.6 percent copper (Kurtak and Jeske, 1986).
|Geologic map unit||(-147.776959010103, 60.3117407408992)|
|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||Kurtak and Jeske (1986) reported the greenstone shows various degrees of chloritization.|
|Workings or exploration||Workings at the mine consist of two adits and an open cut. A 60-foot adit at 518 feet elevation strikes S10E. A 6-foot adit at 435 feet elevation strikes N60W. The open cut is at 560 feet elevation. The U.S. Bureau of Mines visited the prospect in the early 1980s and found both adits but only one open cut (Kurtak and Jeske, 1986). Improvements consisted of a small wharf, two cabins on the beach, a wire tram, and a trail leading to the workings. Eight samples from the adits contained from 280 ppm to 13 percent copper along with trace amounts of silver and gold (Kurtak and Jeske, 1986).|
|Indication of production||Yes; small|
|Reserve estimates||Chugach Alaska Corporation estimated a reserve of 5,900 tons of ore containing 2.4 percent copper, 0.3 ounce of silver per ton, and 0.03 ounce of gold per ton (Hoyt and Rogers, 2000).|
|Production notes||In July 1908, the Russell Ball Copper Company shipped a small amount of copper ore (Johnson, 1918 [B 662-C, p. 184, 216-217]).|
Brooks, A.H., 1921, The future of Alaska mining, in Martin, G.C., and others, Mineral resources of Alaska, 1917: U.S. Geological Survey Bulletin 714-A, p. 5-57.
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.
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.
Grant, U.S., and Higgins, D.F., Jr., 1910, Reconnaissance of the geology and mineral resources of Prince William Sound, Alaska: U.S. Geological Survey Bulletin 443, 89 p.
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, Mining on Prince William Sound: U.S. Geological Survey Bulletin 662-C, p. 183-192.
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.
Moffit, F.H., 1954, Geology of the Prince William Sound region, Alaska: U.S. Geological Survey Bulletin 989-E, p. 225-310.
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.
Richter, D.H., 1965, Geology and mineral deposits of central Knight Island, Prince William Sound, Alaska: Alaska Division of Mines and Minerals Geologic Report 16, 40 p., 1 sheet, scale 1:40,000.
|Reporters||Jeff A. Huber and Carol S. Huber (Anchorage)|
|Last report date||11/9/2001|