Main commodities | Au |
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Other commodities | Cu; Pb; Zn |
Ore minerals | arsenopyrite; chalcopyrite; galena; gold; pyrite; pyrrhotite; sphalerite |
Gangue minerals | calcite; quartz |
Quadrangle map, 1:250,000-scale | SR |
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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 descriptionThe 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) |
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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. |
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. |
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Indication of production | None |
MRDS Number | A010561 |
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ReferencesHoekzema, 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.
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Reporters | Jeff A. Huber (Anchorage) |
Last report date | 1/21/2000 |