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Yakima

Prospect, Inactive

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Alternative names

Yakima Ledge

Commodities and mineralogy

Main commodities Au
Other commodities Cu; Pb; Zn
Ore minerals arsenopyrite; chalcopyrite; galena; gold; pyrite; pyrrhotite; sphalerite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-4
Latitude 60.9627
Longitude -148.3122
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is at or near sea level near the head of Bettles Bay. It is in the N1/2 section 13, T. 10 N., R. 6 E., of the Seward Meridian. This is location 121 of Condon and Cass (1958), location 69 of Cobb and Richter (1972), location 82 of MacKevett and Holloway (1977), location 128 of Cobb and Tysdal (1980), and location S-151 of Jansons and others (1984). This location is accurate to within half a mile.

Geologic setting

Geologic description

The Yakima Ledge prospect consists of a 10- to 31-inch-wide banded quartz-calcite vein that strikes N12E and dips 80W. The vein occurs in a shear zone and contains quartz, calcite, arsenopyrite, chalcopyrite, galena, pyrite, pyrrhotite, sphalerite, and gold (Johnson, 1914 [B 592-G, p. 231]). The host rock is graywacke and slate of the Upper Cretaceous Valdez Group (Cobb and Tysdal, 1980).
Workings on the prospect consist of a 65-foot adit (Johnson, 1914 [B 592-G, p. 231]). No assay results are reported.
Geologic map unit (-148.314287619188, 60.9621238289027)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the vein is in a shear zone that cuts rock of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration Workings on the prospect consist of a 65-foot adit (Johnson, 1914 [B 592-G, p. 231]). No assay results are reported. The U.S. Bureau of Mines searched for the prospect in 1980 but did not locate it.
Indication of production None

References

MRDS Number A010561

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.
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.
Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 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., 1914, The Port Wells gold-lode district, Alaska: U.S. Geological Survey Bulletin 592-G, p. 195-236.
Johnson, B.L., 1916, Mining on Prince William Sound: U.S. Geological Survey Bulletin 642-D, p. 137-145.
Johnson, B.L., 1918, Mining on Prince William Sound: U.S. Geological Survey Bulletin 662-C, p. 183-192.
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.
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 (Anchorage)
Last report date 1/21/2000