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Unnamed (southeast of Mount Watana)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities Ba; Ni
Ore minerals arsenopyrite; asbestos; malachite; pyrite; pyrrhotite
Gangue minerals calcite; quartz; serpentine

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale C-3
Latitude 62.7148
Longitude -148.097
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is 0.6 mile southeast of the summit of Mount Watana at an elevation of about 5,300 feet. The location is accurate to within 1/2 mile.

Geologic setting

Geologic description

The rocks in the Mount Watana area are mostly by Pennsylvanian to Lower Permian basaltic to andesitic metavolcanic rocks, with local ultramafic rocks, chert, and marble (Csejtey and others, 1978). Pyrite and pyrrhotite are disseminated in mafic dikes; pyrite and arsenopyrite occur in andesitic metatuff. Quartz-carbonate veins cut the metabasalt and malachite coats some outcrops. Serpentinized ultramafic rocks, locally cut by asbestos veins, occur in float (Kurtak and others, 1992). Samples of metabasalt contain up to 0.23 percent copper, 203 parts per million nickel, 1 part per million silver, and 220 parts per billion gold; a sample of podiform ultramafic(?) float contains 15 parts per million silver (Kurtak and others, 1992). A sample of mudstone contains 1 part per million silver and 3000 parts per million barium (Miller and others, 1978).
Geologic map unit (-148.09922906981, 62.7143327388146)
Mineral deposit model Basaltic copper, Serpentine-hosted asbestos, Layered mafic intrusion? (Cox and Singer, 1986; model 23, 8d, 5a?)
Mineral deposit model number 23, 8d, 5a?
Alteration of deposit Oxidation of copper mineral.

Production and reserves

Workings or exploration Surface sampling by the U.S. Geological Survey and U.S. Bureau of Mines (Miller and others, 1978; Kurtak and others, 1991).
Indication of production None

Additional comments

MAS/MILS number 20760090.

References

References

Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L, 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northern part of Anchorage quadrangle, and southwest part of Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 60 p., 1 sheet, scale 1:250,000.
Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1991, Mineral investigations in the Valdez Creek Mining District, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 658 p., 2 sheets, scale 1:250,000.
Miller, R.J., Cooley, E.F., O'Leary, R.M., Garmezy, Larry, Csejtey, Bela, Jr., Smith, T.E., and Cleveland, M.N., 1978, Analysis of geochemical samples from the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-file Report 78-1052, 279 p., 3 sheets, scale 1:250,000.
Reporters R.K. Rogers (U. S. Geological Survey contractor)
Last report date 10/4/2002