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Ihly

Prospect, Inactive

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Commodities and mineralogy

Main commodities Ag; Au
Other commodities Pb
Ore minerals chalcopyrite; galena; pyrargyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale C-6
Latitude 62.7228
Longitude -149.5415
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Ihly prospect is at an elevation of about 3,400 feet on El Dorado Creek, an informally named, south tributary to Gold Creek. It is 0.9 mile north of the top of hill 3645, about 0.6 mile northeast of the center of sec. 1, T. 30 N., R. 2 W., Seward Meridian. The location is accurate to within 1/4 mile This is locality 31 of Csejtey and Miller (1978).

Geologic setting

Geologic description

The Ihly prospect consists of near-vertical, north-striking felsic dikes that cut Jurassic or Cretaceous flysch; the dikes are cut by mineralized quartz veins (Kurtak and others, 1992). One dike is 5 feet wide and conformable to bedding, which strikes N 2 0E and dips steeply to the northwest. Another dike is 7 feet wide, strikes north and dips steeply east. Fractures in the dikes vary from 0.5 inch to 8 inches wide and are filled with quartz with galena, pyrite, pyrargyrite, and chalcopyrite. Rock samples collected by the State of Alaska contain up to 0.5 ounce of silver per ton and 0.49 percent lead. In 1952, the claim owners reported assays of 0.02 to 0.06 ounce of gold per ton and 0.28 to 1.98 ounces of silver per ton (Kurtak and others, 1992).
The mineralization was reportedly discovered in 1950 (Berg and Cobb, 1967). The lode claims were initially staked over the prospect by R. Pankey and J. Callahan. As of January 1, 2000, 2 state prospecting sites covered this prospect (Northern Associates Inc., written communication, 2001).
Geologic map unit (-149.543760907081, 62.7223122924483)
Mineral deposit model Polymetallic vein? (Cox and Singer, 1986; model 22c?)
Mineral deposit model number 22c?
Alteration of deposit The dike rock is described as altered but the type of alteration is not specified (Berg and Cobb, 1967).

Production and reserves

Workings or exploration The mineralization was reportedly discovered in 1950 (Berg and Cobb, 1967). The lode claims were initially staked over the prospect by R. Pankey and J. Callahan. As of January 1, 2000, 2 state prospecting sites covered this prospect (Northern Associates Inc., written communication, 2001). Rock samples collected by the State of Alaska (Kurtak and others, 1992). In 1952, the claim owners reported assays of 0.02 to 0.06 ounce of gold per ton and 0.28 to 1.98 ounces of silver per ton.
Indication of production None

Additional comments

MAS/MILS number 20760001.

References

MRDS Number A012198

References

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
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.
Karlson, R.C., Curtin, G.C., Cooley, E.F., and Garmezy, Larry, 1977, Geochemical maps of selected elements and results of spectrographic analyses for heavy-mineral concentrates from the western half of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 77-530, 32 p., 5 sheets, scale 1:250,000.
Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1991, Mineral investigations in the Valdez Creek Mining District, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 658 p., 2 sheets, 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.
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