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Unnamed (north of Beaver Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Mn
Other commodities Hg; Mo
Ore minerals pyrolusite

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale B-3
Latitude 62.43508
Longitude -157.33556
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a north-trending ridge about 3 kilometers north of Beaver Creek, a tributary of the George River. The occurrence is at an elevation of about 1,400 feet, about 0.2 mile south-southwest of hill 1445 and near the northwest corner of section 18, T. 27 N., R. 43 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is an extensive pyrolusite-bearing bed or layer in sandstone, shale and volcaniclastic conglomerate of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The blue-gray zone of semi-massive pyrolusite is about 3 feet thick and can be traced for about 1,000 feet along strike. Grab samples of the sandstone with pyrolusite contained more than 0.5 percent manganese, 240 parts per billion (ppb) mercury, and 10.0 parts per million (ppm) molybdenum (McGimsey and others, 1988).
Geologic map unit (-157.337942795144, 62.4343905025297)
Mineral deposit model Probably sedimentary Mn (Cox and Singer, 1986; model 34b).
Mineral deposit model number 34b
Age of mineralization Late Cretaceous?

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey and the Alaska Division of Geological and Geophysical Surveys in 1984 (McGimsey and others, 1988).
Indication of production None

References

References

McGimsey, R.G., Miller, M.L., and Arbogast, B.F., 1988, Paper version of analytical results, and sample locality map for rock samples from the Iditarod quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-421-A, 110 p., 1 sheet, scale 1:250,000.
Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major oxide, trace element, fossil, paleocurrent, and archeological sample localities: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-A, 48 pages; 1 sheet, scale 1:250,000.
Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)
Last report date 5/23/2003