Latitude: 55°21'21"N
Longitude: 131°38'13"W
Location: This prospect is known only from U.S. Bureau of Mines (1977) claim records. Its approximate location is at an elevation of about 300 feet, about 0.7 mile west-southwest of the mouth of Lower Ketchikan Lake. The site is in section 19, T. 75 S., R. 91 E., of the Copper River Meridian. It corresponds to loc. 64 in Elliott and others (1978). The location probably is accurate within about 0.2 mile.
Geology: This part of Revillagigedo Island is underlain mainly by marine, pelitic sedimentary rocks and andesitic or basaltic volcanic rocks that are intruded by Cretaceous stocks, sills, and dikes of feldspar-porphyritic granodiorite, and by a stock and probably related plugs of Tertiary gabbro (Berg and others, 1988). The strata were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. They subsequently were contact metamorphosed to hornblende hornfels: locally, near some of the Cretaceous granodiorite contacts, and, more widely, peripheral to the Tertiary gabbro. The premetamorphic age range of the strata is uncertain. Berg and others (1988) note that they closely resemble Upper Jurassic to mid-Cretaceous flysch and volcanic rocks nearby on Gravina Island. The country rocks are cut by a high-angle fault along Tongass Narrows that displays about 4 miles of right-lateral offset. According to U.S. Bureau of Mines claim records (1977), this prospect, which appears to be in hornfelsed strata near the contact of a Tertiary gabbro stock, reportedly was staked for gold and copper. No other information about it has been made public.
Commodities (Major) - Au, Cu
Development Status: None
References
Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map I-1807, 27 p., scale 1:250,000. Elliott, R.L., Berg, H.C., and Karl, S.M., 1978, map and table describing metalliferous and selected non-metalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-73-B, 17 p., 1 sheet, scale 1:250,000. U.S. Bureau of Mines, 1977, Claim map, Ketchikan quadrangle: U.S. Bureau of Mines Map 120, scale 1:250,000.
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