|Quadrangle map, 1:250,000-scale||TK|
|Quadrangle map, 1:63,360-scale||B-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This placer prospect is on Walker Creek, about 2 miles upstream from its mouth on Sanona Creek. The location is accurate to within 1/2 mile.|
Geologic descriptionUpper Walker Creek drains an area of siltstone, shale, and boulder and cobble conglomerate of the Jurassic, Naknek Formation (Csejtey and others, 1978). The lower creek drains volcanic rocks, argillite, and sandstone of the Talkeetna Formation. Gold occurs in the alluvial gravel deposits. The valley bottom is 50 to 400 feet wide and the gravel is 10 to 50 feet thick; the stream gradient is 70 to 250 feet per mile (Kurtak and others, 1992). Stream-sediment and placer samples collected by the U.S. Bureau of Mines contain up to 1 part per million silver, 5 parts per million gold, 140 parts per million tungsten, 0.19 percent lead, and 0.27 percent zinc; a sample of conglomerate contains 8 parts per billion palladium (Balen, 1990; Kurtak and others, 1992). Placer claims were staked in 1976. Exploration includes bulldozer cuts in the gravels.
|Geologic map unit||(-147.336411835499, 62.3047117791239)|
|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 staked in 1976. Exploration includes bulldozer cuts in the gravels. Stream sediment and rock samples were collected by the U.S. Bureau of Mines (Balen, 1990; Kurtak and others, 1992).|
|Indication of production||None|
|Reserve estimates||Walker Creek contains an estimated 4 million cubic yards of potentially auriferous, gravel; no grade estimate is given (Kurtak and others, 1992).|
Additional commentsMAS/MILS number 20760056.
|MRDS Number||A106270; A106307|
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.
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.
U.S. Bureau of Mines, 1995, Spatial data extracted from the Minerals Availability System/Minerals Industry Location System (MAS/MILS): U.S. Bureau of Mines Special Publication 12-95, CD-ROM.
|Reporters||R.K. Rogers (U. S. Geological Survey contractor)|
|Last report date||10/2/2002|