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Unnamed (west tributary to upper Little Falls Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Au; Cu
Ore minerals chalcopyrite; pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale B-3
Latitude 62.08
Longitude -149.2565
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,000 feet above a southwest tributary of a creek that is informally called Little Falls Creek (Anderson 1969). The location is about 1/2 mile east of the top of hill 5105, in the SE1/4 sec. 26, T. 28 N., R. 5 E., Seward Meridian. The location is accurate to within 1/4 mile. The occurrence is locality 48 of Csejtey and Miller (1978).

Geologic setting

Geologic description

This occurrence consists of iron-stained Jurassic (?) quartz-diorite gneiss with inclusions of biotite schist; the rocks contain moderate to abundant amounts of pyrite and pyrrhotite, and traces of chalcopyrite (Rose, 1967). A chip sample of a stained outcrop contains 0.06 percent copper and traces of gold and silver (Anderson, 1969).
Geologic map unit (-149.258713189236, 62.0794879546939)
Mineral deposit model Porphyry Cu-Au? (Cox and Singer, 1986; model 20c?)
Mineral deposit model number 20c?
Alteration of deposit The gneissic quartz diorite is iron-stained.

Production and reserves

Workings or exploration Only limited rock sampling (Anderson, 1969).
Indication of production None

References

MRDS Number A012165

References

Anderson, R.E., 1969, Preliminary geochemistry and geology, Little Falls Creek area, Talkeetna Mts. Quadrangle, Alaska: Alaska Division of Mines and Geology Geochemical Report 19, 16 p., 1 sheet, scale 1:42,240.
Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-370, 1 sheet, scale 1:250,000.
Cobb, E.H., and Csejtey, Bela, Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-716, 63 p.
Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and table describing metalliferous and selected nonmetalliferous mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-B, 22 p., 1 sheet, scale 1:250,000.
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.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Rose, A.W., 1967, Geology of an area on the upper Talkeetna River, Talkeetna Mountains quadrangle, Alaska: Alaska Division of Mines and Minerals Geologic Report 32, 7 p., 1 plate, 1:63,360.
Singer, D.A., Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and discussion of the metalliferous and selected non-metalliferous mineral resources of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-file Report 78-558-Q, 33 p., 1 sheet, scale 1:250,000.
Reporters R.K. Rogers (U. S. Geological Survey contractor)
Last report date 10/1/2002