|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 mining on Tyone Creek is concentrated above its junction with Buchia Creek, near the center of sec. 13, T. 24 N., R. 11 E., Seward Meridian. The location is accurate to within 1/4 mile.|
The rocks in Tyone Creek above Buchia Creek are siltstone, shale, and cobble and boulder conglomerate of the Naknek Formation; below Buchia Creek, the rocks are Cretaceous sandstone, siltstone, and claystone, Quaternary glaciofluvial deposits, and Tertiary fluviatile conglomerate (Csejtey and others, 1978). Tertiary conglomerate occurs in the headwaters. area. Gold and platinum occur in the alluvial gravel deposits, which range from 100 to 1000 feet wide and 6 to 50 feet thick (Kurtak and others, 1992). The stream gradient averages 50 feet per mile. Stream-sediment samples collected by the U.S. Bureau of Mines contain up to 4 parts per million platinum, 280 parts per billion palladium, and 0.0032 ounce of gold per cubic yard (Balen, 1990). Gold fineness ranges from 683 to 868, and averages 807 (Kurtak and others, 1992).Reports by prospectors tell of gold plates worth 1 to 5 cents apiece in the headwaters of the Tyonek River (Paige and Knopf, 1907). As of January 1, 2000, a block of 6 state claims covered this site and Red Fox Creek (Northern Associates Inc., written communication, 2001). About 30,000 cubic yards of gravel was mined from Tyone Creek near the mouth of Red Fox Creek; the grade is unknown (Kurtak and others, 1992).
|Geologic map unit||(-147.35451147799, 62.1645971159779)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary placer.|
|Workings or exploration||Stream-sediment sampling by the U.S. Bureau of Mines (Kurtak and others, 1992). As of January 1, 2000, a block of 6 state claims covered this site and Red Fox Creek (Northern Associates Inc., written communication, 2001).|
|Indication of production||Yes; small|
|Reserve estimates||An estimated 20 million cubic yards of potentially auriferous, alluvial material are in the upper section of Tyone Creek; there is no estimate of the grade (Kurtak and others, 1992).|
|Production notes||About 30,000 cubic yards of gravel was mined from Tyone Creek near the mouth of Red Fox Creek; the grade is unknown (Kurtak and others, 1992). Reports by prospectors tell of gold plates worth 1 to 5 cents apiece in the headwaters of the Tyonek River (Paige and Knopf, 1907).|
Additional commentsMAS/MILS number 20760036.
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.
|Reporters||R.K. Rogers (U. S. Geological Survey contractor)|
|Last report date||10/2/2002|