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Willow Mountain

Occurrence, Undetermined

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Commodities and mineralogy

Main commodities Cu; Zn
Ore minerals chalcopyrite; hydrozincite; malachite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale D-4
Latitude 61.7745
Longitude -145.192
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is located on the east flank of Willow Mountain, about one-half mile west of the Richardson Highway; it is at an elevation of about 3,000 feet in the northeast corner of section 22, T. 1 S., R. 1 E., of the Copper River Meridian. This prospect is approximately located, perhaps within one-quarter mile. It is locality 53 of Cobb and Matson (1972) and locality 44 of Winkler and others (1981 [OFR 80-892-B]).

Geologic setting

Geologic description

Hydrozincite and smaller amounts of chalcopyrite and malachite are sparsely but widely disrtibuted in limestone of the Jurassic Talkeetna Formation (Berg and Cobb, 1967, p. 52; Winkler and others, 1981 [OFR 80-892-B]; Winkler and others, 1981 [OFR 80-892-A]).
Geologic map unit (-145.19412307537, 61.7740172627102)
Mineral deposit model Disseminations or replacements in limestone
Age of mineralization Jurassic or younger; the host rocks have been assigned to the Jurassic Talkeetna Formation (Winkler and others, 1981 [OFR 80-892-A].
Alteration of deposit Oxidation; hydrozincite is a secondary, hydrous carbonate of zinc.

Production and reserves

Workings or exploration Only reconnaissance work has been carried out.
Indication of production None

References

MRDS Number A011495

References

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Winkler, G.R., Miller, R.J., MacKevett, E.M., Jr., and Holloway, C.D., 1981, Map and summary table describing mineral deposits in the Valdez quadrangle, southern Alaska: U.S. Geological Survey Open-File Report 80-892-B, 2 sheets, scale l:250,000.
Winkler, G.R., Silberman, M.L., Grantz, Arthur, Miller, R.J., and MacKevett, E.M., Jr., 1981, Geologic map and summary geochronology of the Valdez quadrangle, southern Alaska: U.S. Geological Survey Open-File Report 80-892-A, 2 sheets, scale 1:250,000.
Reporters Travis L. Hudson
Last report date 12/14/2001