|Quadrangle map, 1:250,000-scale||TK|
|Quadrangle map, 1:63,360-scale||A-1|
|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 descriptionThe 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.|
|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 commentsMAS/MILS number 20760103.
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.
|Reporters||R.K. Rogers (U. S. Geological Survey contractor)|
|Last report date||10/2/2002|