|Quadrangle map, 1:250,000-scale||PM|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The map site of this prospect is at an elevation of about 300 feet, just above the beach on the east shore of Acheredin Bay on Unga Island (Wilson and others, 1988, locality 39). The site is about 0.15 mile south-southwest of hill 710. The location is accurate to within 1,000 feet.|
Geologic descriptionThis prospect, discovered, mapped, and sampled in 1980 by Resource Associates of Alaska, consists of a 6-foot-wide, northeast-striking, iron-stained quartz vein in argillized, silicified, and pyritized andesite. The andesite is part of the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). The vein is exposed for 200 feet along strike and is associated with a knob of silicified andesite. It may merge with the Altair vein (PM091) farther inland. In 1982 UNC Teton Exploration Drilling Company conducted a VLF-EM survey, and trenched and sampled the prospect. Ranges of metal values from trench channel samples are as follows: 0.025 to 0.17 ppm gold, 0.5 to 4.2 ppm silver, 4 to 24 ppm copper, 5 to 36 ppm lead, 1 to 20 ppm zinc, 16 to 152 ppm arsenic, and 0.06 to 0.6 ppm mercury (Peterson and others, 1982).
|Geologic map unit||(-160.677069686656, 55.1851624036014)|
|Mineral deposit model||Epithermal gold vein|
|Age of mineralization||Eocene or younger.|
|Alteration of deposit||The wall rock exhibits strong argillic alteration accompanied by pyrite. Some silicification has also been noted (Peterson and others, 1982).|
|Workings or exploration||In 1980 Resource Associates of Alaska mapped and sampled the prospect. In 1982 UNC Teton Exploration Drilling Company cut 168 feet of trench, sampled the prospect, and conducted a VLF-EM survey. Twelve trench channel samples assayed as much as 0.17 ppm gold and 4.2 ppm silver over a 120-foot zone. Thirteen grab samples assayed as much as 1.8 ppm gold and 210 ppm silver.|
|Indication of production||None|
Additional commentsThis site is located on land patented by, or interim-conveyed to, the Aleut Corporation.
Peterson, R.J., Lemmers, J., Handverger, P., Gallagher, J., Pilcher, R., East, J., Macleod, T., Bartels. E., 1982, Geology and precious metals potential Unga, Popof, and Korovin Islands, Shumagin Group, Aleutian Chain, Alaska: UNC Teton Exploration Drilling Company report, 127 p., 5 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Pilcher, S.H., 1986, Unga project: Battle Mountain Exploration Company report, 33 p. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 sheet, scale 1:250,000.
|Last report date||1/15/2001|