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Unnamed (near head of Talkeetna River)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Mo
Other commodities As
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale C-5
Latitude 62.5312
Longitude -149.0235
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 2,900 feet on a west tributary of the Talkeetna River, about 4.9 miles south-southeast of the junction of the Talkeetna River and Cache Creek. It is the SE1/4NE1/4 sec. 11, T. 28 N., R. 2 E., Seward Meridian. The location is accurate to within 1/4 mile.

Geologic setting

Geologic description

This occurrence consists of an extensive deep-red to light-brown, pyritic gossan in aphanitic intermediate metavolcanic rocks of Paleozoic age (Csejtey and Miller, 1978). Granitic rocks are also reported in the area (Miller and others, 1978). Samples of the granitic rocks contain up to 300 parts per million molybdenum; samples of the iron-stained volcanic rocks contain up to 1 part per million silver and 700 parts per million arsenic (Miller and others, 1978).
Geologic map unit (-149.025735873706, 62.5307123380605)
Mineral deposit model Porphyry molybdenum? (Cox and Singer, 1986; model 21b?)
Mineral deposit model number 21b?
Alteration of deposit The volcanic rocks are iron-stained.

Production and reserves

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

References

References

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.
Reporters R.K. Rogers (U. S. Geological Survey contractor)
Last report date 10/4/2002