| Quadrangle map, 1:250,000-scale | CR |
|---|---|
| Quadrangle map, 1:63,360-scale | D-1 |
| Latitude | 55.80946 |
| Longitude | -132.07767 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | The Alaska Nose prospect is just above the shoreline, about 0.8 mile south-southeast of Sunshine Island; it is about 0.4 mile west-northwest of the southeast corner of section 9, T. 70 S., R. 87 E. |
Geologic descriptionThe Alaska Nose prospect consists of an old trench and a 13-foot shaft that seem to have escaped mention in the literature prior to their location by Maas and others (1993). The deposit consists of two sets of quartz veins in alaskite of Cretaceous age (Brew, 1996). One set of veins strikes N35E and dips 75NW; the other strikes N30W and dips 72NE. Galena, sphalerite, and pyrite occur in and along the margins of the veins which are up to 12 inches thick. A select sample from a well-mineralized portion of a vein contained 237 parts per billion gold, 88 parts per million (ppm) silver, 2,921 ppm zinc, and 2.35 percent lead. | |
| Geologic map unit | (-132.079356492192, 55.8091048461976) |
|---|---|
| Mineral deposit model | Polymetallic quartz vein (Cox and Singer, 1986, model 22c). |
| Mineral deposit model number | 22c |
| Age of mineralization | Quartz veins cut Cretaceous alaskite. |
| Workings or exploration | The Alaska Nose prospect consists of an old trench and a 13-foot shaft that seem to have escaped mention in the literature prior to their location by Maas and others (1993). |
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| Indication of production | None |
ReferencesMaas, K.M., Still, J.C., and Bittendender, P.E., 1993, Bureau of Mines mineral investigations in the Ketchikan mining district, Alaska 1990-1992 (abs.): Alaska Miners Association, Juneau Branch, Conference Juneau, Abstracts of Professional Papers, p. 9-10.
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| Reporters | D.J. Grybeck (Applied Geology) |
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| Last report date | 5/1/2004 |