Herron; E.C. Prospect, Alaska Peninsula District, Aleutians East Borough, Alaska, USA
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Location: This prospect is on a trail at an elevation of about 600 feet, on the east side of Unga Island approximately 1 mile north of the abandoned village of Unga (Wilson and others, 1988, locality 47). The location is accurate to within 1,000 feet.
Geology: Trujillo and others (1981) describe this prospect as a 60-foot-wide zone of propylitic and pyritic alteration marked by limonitic and chalcedonic quartz and jasper float. Hand-trenching revealed quartz veins as much as 2 feet in width associated with intense alteration. The best assays obtained were 0.02 ppm gold, 1.5 ppm silver, and 0.78 ppm mercury. An old 20-foot shaft near the veins was sunk into intensely silicified tuffs. The wall rocks are part of the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995).
Workings: The prospect was covered by two unpatented mining claims. Old workings are a 20-foot shaft at the northwest end of claims and scattered pits elsewhere. In 1981 Resource Associated of Alaska hand trenched and sampled the prospect. Their best values were 0.02 ppm gold, 1.5 ppm silver, and 0.78 ppm mercury. Battle Mountain Exploration Company examined and sampled the prospect in 1986, but their samples contained no metal values of note.
Age: Eocene or younger.
Alteration: Alteration includes propylitization and silicification.
Commodities (Major) - Ag, Au
Development Status: None
Deposit Model: Epithermal gold vein
Mineral List
3 entries listed. 2 valid minerals.
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References
Trujillo, R.S., Anderson, G., MacLeod, T., Hendrick, K., Farnham, S., Peterson, J., 1981. Exploration and evaluation of the Unga-Popof-Korovan Islands portion of lands leased from Aleut Native Corporation: Resource Associates of Alaska report, 70 p., 38 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.) Webber, B.S., Moss, J.M., Rutledge, F.A., and Sanford, R.S., 1946, Reconnaissance examinations of parts of the Alaska Peninsula and Aleutian Islands southwestern Alaska: U.S. Bureau of Mines, unpublished report of investigations, 40 p. (Report held by the U.S. Geological Survey, Anchorage.) 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. Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., 1 plate, scale 1:250,000.
