|Other commodities||Ag; Zn|
|Ore minerals||chalcopyrite; chalmersite; malachite; native copper; pyrite; pyrrhotite; sphalerite|
|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 about 0.3 mile north-northeast of the head of Northeast Cove of Drier Bay and between elevations of 950 and 1,200 feet. It is in the NW1/4 section 28, T. 3 N., R. 10 E., of the Seward Meridian. This is location 29 of Condon and Cass (1958), location 110 of Cobb and Richter (1972), location 138 of MacKevett and Holloway (1977), location 232 of Cobb and Tysdal (1980), and location S-56 of Jansons and others (1984). This location is accurate to within 300 feet.|
Nelson and others (1985) mapped bedrock in this area as greenstone of the Orca Group of early Tertiary age. The prospect consists of a weakly developed shear zone that contains a fine network of quartz-sulfide stringers (Johnson, 1914 [B 592-G, p. 237-243]). The shear zone is between 20 to 55 feet wide, but the margins are poorly defined; it strikes N 15 E and dips vertically. The zone is only slightly mineralized as a whole, and in some places short lenses of solid or nearly solid sulfide minerals occur in the sheared greenstone (Johnson, 1914 [B 592-G, p. 237-243]). The sulfide minerals consist of chalcopyrite, chalmersite, sphalerite, and pyrrhotite (Johnson, 1914 [B 592-G, p. 237-243]). Kurtak and Jeske (1986) reported the presence of malachite staining and a trace of native copper.Samples collected from the adit and the surface trenches contained between 50 ppm and 1.3 percent copper and 0.3 to 11 ppm silver (Kurtak and Jeske, 1986).
|Geologic map unit||(-147.727532757098, 60.3257229123054)|
|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.|
|Workings or exploration||Workings on the prospect consist of a 742-foot-long adit at 950 feet elevation, with 160 feet of crosscuts and a winze. There are also two surface trenches located at 1,200 feet elevation (Johnson, 1914 [B 592-G, p. 237-243]). There is a collapsed cabin below the adit (Kurtak and Jeske, 1986). Samples collected from the adit and surface trenches contained between 50 ppm and 1.3 percent copper and from 0.3 to 11 ppm silver (Kurtak and Jeske, 1986). In 1911, a test shipment of ore was sent to the smelter in Tacoma, Washington, but results are not known (Kurtak and Jeske, 1986). There are 200 tons of ore on the dump.|
|Indication of production||None|
|Reserve estimates||Kurtak and Jeske (1986) reported that 200 tons of ore was stockpiled on the dump in 1911.|
Additional commentsThe mining claims were patented in 1916.
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.
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., 1914, The Port Wells gold-lode district, Alaska: U.S. Geological Survey Bulletin 592-G, p. 195-236.
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||11/30/2001|