Unnamed Occurrence (ARDF - CR070), Baker Point, Kasaan Bay, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
Location: This occurrence is at or near sea level, about 0.6 mile south of Baker Point and 0.2 mile north-northeast of the southwest corner of section 30, T. 73 S., R. 86 E. The location is accurate.
Geology: This occurrence consists of magnetite layers and lenses up to several inches thick in banded chert and argillite that is interbedded with a pyroxene-bearing flow or dike (Sainsbury, 1961). Deformed limestone, banded chert, and calcareous argillite crop out to the south. The rocks are probably part of the Descon Formation of Silurian and Ordovician age (Eberlein and others, 1983; Brew, 1996). Several samples collected by Maas and others (1992, 1995) contained up to 72.13 percent iron but insignificant amounts of other metals.
Workings: Only sampling by government geologists.
Age: Magnetite layers and lenses in metamorphosed, Silurian or Ordovician sedimentary and volcanic rocks.
Commodities (Major) - Fe
Development Status: None
Deposit Model: Magnetite layers in metamorphosed volcanic and sedimentary rocks.
1 entry listed. 1 valid mineral.
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Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000. Cobb, E. H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-869, 262 p. Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p. Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p. Maas, K.M., Still, J. C., and Bittenbender, P. E., 1992, Mineral investigations in the Ketchikan mining district, Alaska, 1991 - Prince of Wales Island and vicinity: U.S. Bureau of Mines Open-File Report 81-92, 69 p. Sainsbury, C.L., 1961, Geology of part of the Craig C-2 quadrangle and adjoining area, Prince of Wales Island, southeastern Alaska: U.S. Geological Survey Bulletin 1058-H, p. H299-H362.
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