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Tazimina

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu; Pb; Zn
Other commodities Ag
Ore minerals bornite; chalcopyrite; native copper; pyrite
Gangue minerals chlorite; quartz; sericite

Geographic location

Quadrangle map, 1:250,000-scale LC
Quadrangle map, 1:63,360-scale A-3
Latitude 60.08
Longitude -153.91
Nearby scientific data Find additional scientific data near this location
Location and accuracy Locality is 4.8 km up an unnamed southward flowing tributary of Tazimina River or 5.6 km NE of the eastern end of Upper Tazimina Lake. This is locality 38 of Nelson and others (1985) and locality 37 of MacKevett and Holloway (1977). Sec. 22, T. 1 S., R. 27 W., of the Seward Meridian. Accurate within 1,600 meters.

Geologic setting

Geologic description

Mineralization is confined to older schistose rocks; the Lake Clark quartz-sericite-chlorite schist contains 1 percent to 10 percent disseminated pyrite and local massive-sulfide pods having as much as 50 percent pyrite. Chalcopyrite and native copper disseminated as small grains in trace amounts. Some six-inch sulfide veins or beds parallel to the foliation of schist contain 60 percent pyrite, 20 percent quartz, 10 percent magnetite, 5 percent chalcopyrite, 1 percent bornite, and trace of native copper. Massive sulfide float boulders up to six feet in diameter contain 17 ppm Ag, 5,000 ppm Cu, 5,000 ppm Pb, and 30,000 ppm Zn. These boulders could be glacial erratics but the source is believed to be within 90 meters of their current location (Resource Associates of Alaska, 1976).
Geologic map unit (-153.912187220722, 60.0793407400281)
Mineral deposit model Kuroko massive sulfide (metamorphosed)? (Cox and Singer, 1986; model 28a?).
Mineral deposit model number 28a?
Age of mineralization Late Paleozoic or younger.
Alteration of deposit Unknown

Production and reserves

Workings or exploration Massive sulfide boulders up to six feet in diameter contain 17 ppm Ag, 5,000 ppm Cu, 5,000 ppm Pb, and 30,000 ppm Zn (Resource Associates of Alaska, 1976).
Indication of production None
Reserve estimates No reserves
Production notes No production

Additional comments

Resource Associates of Alaska, Inc. (1976), reported the schists do not contain enough economically viable mineralization to warrant further work. The massive sulfide boulders, though containing ore grade material, probably come from relatively small lenses or pods. Site is in Lake Clark National Park and Preserve.

References

MRDS Number A013020

References

Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska; Supplement to Open-File Report 76-485; Part A, Summaries to January 1, 1981: U.S. Geological Survey Open-File Report 81-1343-A, 25 p.
Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska; Supplement to Open-File Report 76-485; Part B, Lists of references to Januray 1, 1981: U.S. Geological Survey Open-File Report 81-1343-B, 20 p.
Nelson, W.H., King, H.D., Case, J.E., Tripp, R.B., Crim, W.D., and Cooley, E.F., 1985, Mineral resource map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-B, 1 sheet, scale 1:250,000.
Resource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, Contract JO166108, 7 v.
Reporters M.L. Miller (USGS); D.P. Bickerstaff (USGS)
Last report date 6/15/1998