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Unnamed (overlooking tributary of Cheeneetnuk River)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Pb; Zn
Other commodities Ag; Cu
Ore minerals iron oxides

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale A-4
Latitude 62.173
Longitude -154.928
Nearby scientific data Find additional scientific data near this location
Location and accuracy This unnamed occurrence is located on a south-facing spur overlooking an unnamed tributary of Cheeneetnuk River. It is about 2.5 kilometers southwest of VABM Big (White Mountain), at an elevation of 1,900 feet (579 m) in the NE1/4 sec. 15, T. 24 N., R. 31 W., of the Seward Meridian. The location corresponds to map number 25-26 of Gilbert (1981); his station no. 79WG192.

Geologic setting

Geologic description

This unnamed occurrence is a ferricrete gossan hosted in an unnamed Ordovician mudstone unit of the Nixon Fork subterrane (Gilbert, 1981; Wilson and others, 1998). The gossan is parallel to bedding in the unit; no surface measurements are available. Two grab samples taken in the gossan zone contained up to 3.0 grams/tonne silver, 81 ppm copper, 320 ppm lead, and 6,800 ppm zinc (Gilbert, 1981).
Geologic map unit (-154.930288801545, 62.1723530426619)
Mineral deposit model Polymetallic replacement? (Cox and Singer, 1986; model 19a?).
Mineral deposit model number 19a?

Production and reserves

Workings or exploration W.G. Gilbert found the occurrence during geological mapping for the Alaska Division of Geological and Geophysical Surveys in 1979 (Gilbert, 1981). Two grab samples taken across the gossan zone contained up to 3.0 grams/tonne silver, 81 ppm copper, 320 ppm lead, and 6,800 ppm zinc (Gilbert, 1981).
Indication of production None
Reserve estimates None.

References

MRDS Number 10307839

References

Gilbert, W.G., 1981, Preliminary geologic map and geochemical data, Cheeneetnuk River area, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File Report 153, 12 p., 2 sheets, 1:63,360 scale.
Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 76 p., 3 sheets, scale 1:500,000.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting)
Last report date 12/11/1998