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Unnamed

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Zn
Other commodities Ce; Rb
Gangue minerals limonite

Geographic location

Quadrangle map, 1:250,000-scale MD
Quadrangle map, 1:63,360-scale C-2
Latitude 63.715
Longitude -153.595
Nearby scientific data Find additional scientific data near this location
Location and accuracy Occurrence is situated on a southerly slope of Sischu Mountains at 2,050 feet (625 m) in Section 33, T. 20 S., R. 27 E., of the Kateel River Meridian. Location is known to within 500 feet (152 m).

Geologic setting

Geologic description

This occurrence consists of heavily altered, limonitic rhyolite breccia of Sischu Volcanic Field (Miller and others, 1980; Moll and others, 1981; Clautice and others, 1993). Mineral occurrence is inferred to be Late Cretaceous, based on isotopic age of Sischu Volcanics (Moll and others, 1981). Clautice and others (1993) and Miller and others (1980) report anomalous zinc, rubidium and cerium values from the limonitic breccia zones.
Geologic map unit (-153.59734852514, 63.7144249789361)
Age of mineralization Mineral occurrence is inferred to be Late Cretaceous, based on isotopic age of Sischu Volcanics (Moll and others, 1981).
Alteration of deposit Extensive clay and chalcedonic alteration.

Production and reserves

Workings or exploration Clautice and others (1993) and Miller and others (1980) report anomalous zinc, rubidium, and cerium values from limonitic breccia zones.
Indication of production None
Reserve estimates None.

References

References

Clautice, K.H., Bowman, N.D., Clough, J.G., Gilbert, W.G., Kline, J.T., Smith, T.E., and Blodgett, R.B., 1993, Land selection unit 8 (Kantishna River, Ruby, and Medfra quadrangles): References, lead isotope, geochemical and major oxide data: Alaska Division of Geological & Geophysical Surveys Public Data File 93-8, 46 p., 1 sheet, scale 1:250,000.
Miller, T.P., Moll, E.J., and Patton, W.W. Jr., 1980, Uranium and thorium rich volcanic rocks of the Sischu Creek area, Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-803, 9 p.
Moll, E.J., Silberman, M.L., and Patton, W.W. Jr., 1981, Chemistry, mineralogy, and K-Ar ages of igneous and metamorphic rocks of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-C, 15 p., 2 sheets, scale 1:250,000.
Reporters Bundtzen, T.K. (Pacific Rim Geological Consulting)
Last report date 6/8/1998