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Buchia Creek

Prospect, Inactive

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Commodities and mineralogy

Main commodities Au
Other commodities Pt
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale A-1
Latitude 62.146
Longitude -147.4117
Nearby scientific data Find additional scientific data near this location
Location and accuracy Placer claims extend for about 4 miles on Buchia Creek , a tributary of Tyone Creek, from between about 3,600 and 4,200 feet in elevation. The claims are centered in the SE1/4 sec. 22, T. 24 N., R. 11 E., Seward Meridian. The location is accurate to within 1/2 mile.

Geologic setting

Geologic description

The rocks in the Buchia Creek drainage are siltstone, shale, and cobble and boulder conglomerate of the Jurassic Naknek Formation (Csejtey and others, 1978). Tertiary fluviatile conglomerate is present on the ridge in its headwaters. White Hill, to the south, is underlain by folded and faulted Cretaceous sandstone, siltstone, and claystone, and by limestone of the Nelchina Formation. Gold occurs in the alluvial gravel that is up to 15 feet thick; the creek gradient averages 400 feet per mile (Kurtak and others, 1992). Stream-sediment samples collected by the U.S. Bureau of Mines contain up to 0.0015 ounce of gold per cubic yard and 50 parts per billion platinum (Kurtak and others, 1992). Samples from tributaries draining White Hill contain up to 0.0015 ounce of gold per cubic yard. The gold fineness varies from 826 to 858. Placer claims were active from 1979 to 1983.
Geologic map unit (-147.413910810295, 62.1454965926922)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a
Age of mineralization Quaternary placer.

Production and reserves

Workings or exploration Placer claims were active from 1979 to 1983. Stream-sediment sampling by the U.S. Bureau of Mines (Kurtak and others, 1992).
Indication of production None
Reserve estimates An estimated 1 million cubic yards of potentially auriferous, alluvium are in the drainage; no grade estimate is given (Kurtak and others, 1992).

Additional comments

MAS/MILS number 20760103.

References

MRDS Number A106275

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.
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.
Reporters R.K. Rogers (U. S. Geological Survey contractor)
Last report date 10/2/2002