|Ore minerals||gold; unspecified sulfides|
|Gangue minerals||calcite; quartz|
|Quadrangle map, 1:250,000-scale||SI|
|Quadrangle map, 1:63,360-scale||B-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is at an elevation of about 550 feet, about 1.8 miles south-southeast of the south end of Rodman Bay. The prospect is 0.1 mile south-southwest of the northeast corner of sec. 36, T. 51 S., R. 62 E. It is location P-98 of Bittenbender and others (1999), location 52 of Cobb (1972, 1978), and MAS no. 0021140075 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 mile.|
Loney and others (1975) map the rocks in the area of this prospect as Triassic(?) phyllite and greenstone, and undivided Mesozoic metasedimentary and metavolcanic strata. The rocks are complexly folded and cut by diverse, mainly northwest-striking, high-angle faults.Wright and Wright (1905) describe this prospect as a mineralized belt several hundred feet wide of wrinkled slate that contains interlaced quartz and calcite stringers with (unspecified) sulfides and gold. The slate is intruded by diabase dikes and a granodiorite pluton crops out a few miles away. Workings in the early 1900s included a 700-foot tunnel and considerable surface exploration, and construction of a 7-mile-long railroad to tidewater. The deposit reportedly is very low grade and there is no record of any production. Wright (1907) and Wright and Wright (1905) describe this prospect as an auriferous quartz vein. A high-grade, picked sample assayed 45 parts per billion gold (Bittenbender and others, 1999). Knopf (1912, p. 8) termed this prospect 'A remarkable mining failure.'
|Geologic map unit||(-135.380977330926, 57.4098509516831)|
|Mineral deposit model||Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).|
|Mineral deposit model number||36a|
|Workings or exploration||Workings in the early 1900s included a 700-foot tunnel and considerable surface exploration; and construction of a 7-mile-long railroad to tidewater.|
|Indication of production||None|
Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Sitka quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-467, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sitka quadrangle: U.S. Geological Survey Open-File Report 78-450, 124 p.
Loney, R.A., Brew, D.A., Muffler, L.J.P., and Pomeroy, J.S., 1975, Reconnaissance geology of Chichagof, Baranof, and Kruzof Islands, southeastern Alaska: U.S. Geological Survey Professional Paper 792, 105 p.
U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]
Wright, C.W., 1907, Lode mining in southeastern Alaska, in Brooks, A.H., and others, Report on progress of investigations of mineral resources of Alaska in 1906: U.S. Geological Survey Bulletin 314, p. 47-72.
|Reporters||H.C. Berg (U.S. Geological Survey)|
|Last report date||10/16/2004|