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Unnamed Occurrence (ARDF - SI158; Middle Arm Kelp Bay), Chichagof District, Sitka Borough, Alaska, USA

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Location: This occurrence is at an elevation of about 100 feet on the south shore of the Middle Arm of Kelp Bay. The occurrence is 0.2 mile west of the center of sec. 28, T. 52 S., R. 65 E. It is location P-99 of Bittenbender and others (1999), location 62 of Cobb (1972, 1978), and MAS no. 0021140188 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 mile.
Geology: The rocks in the vicinity of this occurrence are part of the Jurassic and/or Triassic, Kelp Bay Group which consists of phyllite, quartzite greenschist, greenstone, graywacke, and semischist.( Loney and others, 1975). Loney and others (1963) noted pyrite, chalcopyrite, covellite, and bornite in quartz veins and iron-stained siliceous rocks in this area. Bittenbender and others (1999) sampled a quartz veinlet with minor pyrite and a trace of chalcopyrite. The samples had low metal values; the only elements of note were from less than 5 to 10 parts per billion gold and up to 192 parts per million copper.
Workings: Apparently only limited surface sampling by government geologists.
Age: Triassic or younger based on the age of the host rock.
Development Status: None
Deposit Model: Quartz veins with copper minerals in low-grade metamorphic rocks.

Mineral List



5 entries listed. 5 valid minerals.

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References

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., Berg, H.C., Pomeroy, J.S., and Brew, D.A., 1963, Reconnaissance geologic map of Chichagof Island and northwestern Baranof Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-388, 1 sheet, scale 1:250,000. 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]

 
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