|Quadrangle map, 1:250,000-scale||TK|
|Quadrangle map, 1:63,360-scale||C-3|
|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 descriptionThe 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.|
|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 commentsMAS/MILS number 20760090.
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.
|Reporters||R.K. Rogers (U. S. Geological Survey contractor)|
|Last report date||10/4/2002|