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  3. Alaska Resource Data File (ARDF)

Marshall Mountain

Prospect, Probably inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale C-6
Latitude 61.6906
Longitude -145.9047
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is about one-third mile northwest of the north peak of Marshall Mountain. It is at an elevation of about 4,200 feet near the center of the SW1/4 section 14, T. 2 S., R. 4 W., of the Copper River Meridian. This prospect is probably located to within one-quarter mile. It is locality 82 of Winkler and others (1981 [OFR 80-892-B]).

Geologic setting

Geologic description

Winkler and others (1981 [OFR 80-892-B]) reported that sheared pillow basalt and massive greenstone contains pyrite, pyrrhotite, and chalcopyrite. Old cabins are present at this prospect, below it at timberline, and nearby on Klutina Lake. The metavolcanic rocks are part of the McHugh Complex melange (Winkler and others, 1981 [OFR 80-892-A]).
Geologic map unit (-145.906845781948, 61.6901000467093)
Mineral deposit model Cyprus massive sulfide? (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a?
Age of mineralization Not known; the host metavolcanic rocks were probably incorporated in the McHugh Complex in the Late Cretaceous (Winkler and others, 1981 [OFR 80-892-A]).

Production and reserves

Workings or exploration Only some exploration pits.
Indication of production None

References

MRDS Number A011596

References

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