|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||Placer claims on Joe Creek extend from the SW1/4 sec. 8, T. 25 N., R. 11 E., Seward Meridian, to its junction with Sanona Creek. The location is at the upper end of the claims, at an elevation of about 3,750 feet. The location is accurate to within 1/2 mile.|
Geologic descriptionUpper Joe Creek drains an area of siltstone, shale, and cobble and boulder conglomerate of the Naknek Formation (Csejtey and others, 1978). The middle part of the creek cuts sandstone, siltstone, and conglomerate in fault contact with Talkeetna Formation volcanic rocks, sandstone, and argillite. Some ridges are capped with Tertiary fluviatile conglomerate. Gold occurs in alluvial gravel deposits. The deposits are 50 to 800 feet wide but the thickness is unknown. The gradient of the stream is 60 to 150 feet per mile (Kurtak and others, 1992). Stream-sediment samples collected by the U.S. Bureau of Mines contain up to 1 part per million silver and up to 0.0014 ounce of gold per cubic yard (Kurtak and others, 1992).
|Geologic map unit||(-147.461911544466, 62.271209097057)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary placer.|
|Workings or exploration||At least 37 placer claims were staked between 1980 and 1983. The Bureau of Mines collected samples in the creek (Balen, 1990; Kurtak and others, 1992).|
|Indication of production||None|
|Reserve estimates||Joe Creek contains an estimated 10 million cubic yards of potentially auriferous, alluvial material; no grade estimate is available (Kurtak and others, 1992).|
Additional commentsMAS/MILS number 20760101.
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.
|Reporters||R.K. Rogers (U. S. Geological Survey contractor)|
|Last report date||10/2/2002|