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Unnamed (south tributary to East Fork, Iron Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Sn
Ore minerals malachite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale B-4
Latitude 62.3272
Longitude -148.8189
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,700 feet on the west side of a south tributary to the upper East Fork, Iron Creek. It is about 0.1 mile south-southwest of the center of sec. 24, T. 26 N., R. 3 E., Seward Meridian. The location is accurate within 1/2 mile. This is locality 65 of Csejtey and Miller (1978) and locality 65 of Singer and others (1978).

Geologic setting

Geologic description

The rocks in the area of this occurrence includes Tertiary felsic and mafic, subaerial volcanic rocks and related shallow intrusions (Csejtey and others, 1978). Nearby, at a lower elevation, a Jurassic plutonic and metamorphic assemblage is mainly of quartz diorite, granodiorite, amphibolite, and greenschist. The occurrence is a malachite-stained, pyrite-bearing quartz vein that cuts probable Tertiary, volcanic rock. A float sample contains 1,500 parts per million copper and detectable (but less than 10 parts per million) tin (Miller and others, 1978).
Geologic map unit (-148.821112745566, 62.3267082877091)
Age of mineralization Probably Tertiary or younger.
Alteration of deposit Malachite staining.

Production and reserves

Workings or exploration Only surface sampling by the U.S. Geological Survey (Miller and others, 1978).
Indication of production None

References

MRDS Number A012182

References

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.
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.
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 D. Bickerstaff (U.S. Geological Survey)
Last report date 10/1/2002