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  3. Alaska Resource Data File (ARDF)

August

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals azurite; chalcopyrite; malachite

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale D-2
Latitude 62.8477
Longitude -147.9209
Nearby scientific data Find additional scientific data near this location
Location and accuracy The August prospect is at an elevation of about 3,800 feet on the east side of a north tributary of the Susitna River. The prospect is in the SW1/4NE1/4 sec. 22, T. 32 N., R. 8 E., Seward Meridian. The location is accurate to within 1/4 mile. This is locality 28 of MacKevett and Holloway (1977) and locality 25 of Csejtey and Miller (1978).

Geologic setting

Geologic description

The rocks in the area are Upper Triassic basaltic metavolcanic rocks interbedded with argillite and limestone or marble (Csejtey and others, 1978). The deposit consists of chalcopyrite, azurite, and malachite in a breccia zone in metabasalt near a contact with fossiliferous limestone (Kurtak and others, 1992). U.S. Bureau of Mines samples of mineralized metabasalt contain 1.4 percent copper and 1.5 parts per million silver (Kurtak and others, 1992). Exploration in the 1970’s, by Cities Service Minerals Co. Inc., included the collection of 46 rock samples, 80 soil samples, and 7 stream-sediment samples; IP, VLF and ground magnetics surveys; excavating 3 trenches; and drilling 4 diamond drill holes (Don Stevens, written communication, 1992).
Geologic map unit (-147.923138275159, 62.8472393289496)
Mineral deposit model Basaltic copper (Cox and Singer, 1986; model 23)
Mineral deposit model number 23
Alteration of deposit Oxidation of copper minerals.

Production and reserves

Workings or exploration Surface sampling by U.S. Bureau of Mines (Balen, 1990; Kurtak and others, 1992). Exploration in the 1970s, by Cities Service Minerals Co. Inc., included the collection of 46 rock samples, 80 soil samples, and 7 stream-sediment samples; IP, VLF and ground magnetics surveys; excavating 3 trenches; and drilling 4 diamond drill holes (Don Stevens, written communication, 1992). The August 1-8 claims were staked by Cities Service Minerals in the 1970s. No mining claims were present as of January 1, 2000 (Northern Associates Inc., written communication, 2001).
Indication of production None

Additional comments

MAS/MILS number 20760049.

References

MRDS Number A012170

References

Balen, M.D., 1990, Geochemical sampling results from Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 sheets, scale 1:63,360.
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.
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 10/2/2002