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  3. Alaska Resource Data File (ARDF)

Unnamed (near foot of Tsina Glacier)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Pb; Zn
Ore minerals chalcopyrite; galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale B-5
Latitude 61.2544
Longitude -145.8026
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the south side of the foot of Tsina Glacier. It is near the center of the south border of section 17, T. 7 S., R. 3 W., of the Copper River Meridian. This occurrence is probably located to within one-quarter mile. It is locality 79 of Winkler and others (1981 [OFR 80-892-B]).

Geologic setting

Geologic description

Iron-stained lenses and quartz veins in mafic metavolcanic rocks of the Late Cretaceous Valdez Group contain pyrite, chalcopyrite, galena, and sphalerite (Winkler and others, 1981 [OFR 80-892-B]). The sulfide minerals are disseminated in the mafic metavolcanic rocks and in the quartz veins. The metavolcanic rocks probably represent ocean floor basalts that were accreted with the flysch of the Valdez Group (Winkler and others, 1981 [OFR 80-892-A]).
Geologic map unit (-145.804671534824, 61.2538907850514)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Late Cretaceous; the host metavolcanic rocks probably represent ocean floor basalts that were accreted with the flysch of the Valdez Group (Winkler and others, 1981 [OFR 80-892-A]).
Alteration of deposit Oxidation; mineralized zones are iron stained.

Production and reserves

Workings or exploration Only reconnaissance surface examination.
Indication of production None

References

MRDS Number A011593

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