Unnamed Prospect (ARDF - TK067; on Kosina Creek), Valdez Creek District, Matanuska-Susitna Borough, Alaska, USA
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Location: This placer prospect is at an elevation of about 2,200 feet on Kosina Creek below the junction with Gilbert Creek. The location is accurate to within 1/4 mile. This is locality B26 of Kurtak and others (1992). Also known as the Watana Rainbow prospect.
Geology: This gold placer prospect is in alluvial gravel deposits that conceal a fault contact between Lower to Middle Jurassic amphibolite and Pennsylvanian(?) and Lower Permian basaltic and andesitic metavolcanic rocks (Csejtey and others, 1978). The gravel contains many large granitic boulders; this makes sampling and mining potentially difficult (Kurtak and others, 1992). Placer samples, which contain abundant magnetite, contain up to 0.0006 ounce of gold per cubic yard.
Workings: Placer sampling by the U.S. Bureau of Mines (Kurtak and others, 1992).
Age: Quaternary placer.
Commodities (Major) - Au
Development Status: None
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)
2 entries listed. 2 valid minerals.
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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., 1992, Mineral investigations in the Valdez Creek mining district, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 659 p., 2 plates, scale 1:250,000.