Unnamed (northeast of Middle Fork Iron Creek) (ARDF #TK081) Ag, Au, Cu, Pb, Zn

Unnamed (northeast of Middle Fork Iron Creek)

Occurrences, Inactive

Commodities and mineralogy

Main commodities	Ag; Au; Cu; Pb; Zn

Geographic location

Quadrangle map, 1:250,000-scale	TK
Quadrangle map, 1:63,360-scale	B-5
Latitude	62.3469
Longitude	-149.0332
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This site is a cluster of occurrences extending from an elevation of 3,400 to 4,000 feet on the northeast side of the Middle Fork, Iron Creek. The cluster is centered in the N1/2 of sec. 14, T. 26 N., R. 2 E., Seward Meridian and is accurate to within 1/4 mile.

Geologic setting

Geologic description These occurrences are near a greenstone-marble contact (Fechner, 1986). Grab samples of marble taken by the U.S. Bureau of Mines contain up to 150 parts per million silver, 0.39 part per million gold, 13,500 parts per million copper, and 12,000 parts per million lead. Grab samples of sulfide-bearing mafic volcanic rock contain up to 190 parts per million silver, 0.44 part per million gold, and 10 percent zinc. A 4-foot chip sample of sulfide-bearing mafic volcanic rock contains 9% zinc (Fechner, 1986).
Geologic map unit	(-149.035421132431, 62.3464056441174)
Mineral deposit model	Cyprus massive sulfide? (Cox and Singer, 1986; model 24a?)
Mineral deposit model number	24a?

Production and reserves

Workings or exploration	Surface sampling by the U.S. Bureau of Mines (Fechner, 1986).
Indication of production	None

References

References 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. Fechner, S.A., 1986, 1984 sample results for Bureau of Mines site-specific mineral investigations within the Yentna Mining District, Alaska: U.S. Bureau of Mines Open-File Report 28-86, 53 p. Schmidt, J.M., Werdon, M.B., and Wardlaw, B., 2003, New mapping near Iron Creek, Talkeetna Mountains, indicates presence of Nikolai Greenstone, in Clautice, K.H., and Davis, P.K., eds., 2003, Short Notes on Alaska Geology 2003: Alaska Division of Geological & Geophysical Surveys Professional Report 120, p. 101-108. Werdon, M.B., Riehle, J.R., Schmidt, J.M., Newberry, R.J., and Pessel, G.H., 2000, Major-oxide, minor-oxide, trace-element, and geochemical data from rocks collected in the Iron Creek area, Talkeetna Mountains B-5 Quadrangle, Alaska in 1999: Alaska Division of Geological & Geophysical Surveys Raw Data File 2000-2, 31 p., 2 sheets, scale 1:63,360.
Reporters	R.K. Rogers (U. S. Geological Survey contractor)
Last report date	10/4/2002