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Nellie Group

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Zn
Ore minerals chalcopyrite; cubanite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-2
Latitude 60.3422
Longitude -147.7363
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located 1.5 miles north-northwest of the head of Northeast Cove of Drier Bay and is at an elevation of about 650 feet. It is in the valley of a steep southwest-flowing creek. It is in the NW1/4 section 21, T. 3 N., R. 10 E., of the Seward Meridian. This is location 104 of Cobb and Richter (1972), location 133 of MacKevett and Holloway (1977), location 223 of Cobb and Tysdal (1980), and location S-58 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The prospect consists of a N 25 E-trending shear zone that dips 75 SE, cutting greenstone country rock (Johnson, 1918 [B 662-C, p. 217-218]). Nelson and others (1985) have mapped the country rock as Orca Group of early Tertiary age. The workings on the prospect consist of five open cuts, a 6-foot-deep shaft, and a 36-foot adit. At the adit face, the shear zone is 9 feet wide and has a 2-inch-wide band of pyrrhotite and chalcopyrite near the footwall (Johnson, 1918 [B 662-C, p. 217-218]). This zone can be traced along strike for about three-quarters of a mile. At an elevation of 1,200 feet, a 6-foot-deep shaft exposes a 10-foot-wide shear zone containing chalcopyrite (Johnson, 1918 [B 662-C, p. 217-218]). Tysdal (1978 [MF-880-A]) summarizes the prospect as a limonite-stained sheared greenstone containing chalcopyrite, pyrrhotite, cubanite, and quartz. Samples collected from the prospect contained from 9 to 150 ppm copper and 25 to 150 ppm zinc (Kurtak and Jeske, 1986).
Geologic map unit (-147.738338140734, 60.3416271316838)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b
Age of mineralization Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.
Alteration of deposit The shear zone is limonite-stained.

Production and reserves

Workings or exploration The workings on the prospect consisted of five open cuts, a 6-foot-deep shaft, and a 36-foot adit (Johnson, 1918 [B 662-C, p. 217-218]). The U.S. Bureau of Mines did not locate any of the reported workings when they visited the site in the early 1980s. They collected samples from what appeared to be the reported mineralized shear zone. Five random chip samples contained from 9 to 150 ppm copper and 25 to 150 ppm zinc (Kurtak and Jeske, 1986).
Indication of production None

Additional comments

Kurtak and Jeske (1986) reported that the working were collapsed and filled in.

References

References

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.
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.
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.
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.
Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.
Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 11/30/2001