Brown Bear Prospect, Hope District, Kenai Peninsula Borough, Alaska, USA

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Location: The prospect is located near the head of Kenai Lake on the east side of the Seward Highway about 150 feet above the lake. It is in the NE1/4 section 19, T. 3 N., R. 1 E., of the Seward Meridian. This is location 78 of Cobb and Tysdal (1980) and location S-220 of Jansons and others (1984). This location is accurate to within a quarter of a mile.
Geology: The host rock of the Brown Bear prospect is slate and sandstone of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). The host rock strikes N12E and dips 45E. The prospect consists of a 1.5- to 5-inch-wide quartz-calcite vein that parallels the host rock strike and can be traced along the surface for 250 feet (Hoekzema and Sherman, 1983). Metallic minerals include arsenopyrite, chalcopyrite, galena, pyrrhotite, pyrite, and sphalerite; gold is also present (Cobb and Tysdal, 1980). Martin and others (1915) reported a short adit at the prospect but gave no details. No assay results are reported in the literature.
Workings: Workings on the prospect consist of (Martin and others, 1915). Martin and others (1915) reported that several feet of adit driven in 1912 at the prospect but gave no further details. There are no assay results reported in the literature.
Age: Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.

Commodities (Major) - Au; (Minor) - Pb, Zn
Development Status: None
Deposit Model: Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)

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. 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. Martin, G.C., Johnson, B.L., and Grant, U.S., 1915, Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, 243 p. 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. 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.

Mineral List

Arsenopyrite Calcite Chalcopyrite

Galena Gold Pyrite

Pyrrhotite Quartz Sphalerite

9 entries listed. 9 valid minerals.