|Quadrangle map, 1:250,000-scale||TK|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This placer prospect is at an elevation of about 2,200 feet on Kosina Creek below the junction with Gilbert Creek. The location is accurate to within 1/4 mile. This is locality B26 of Kurtak and others (1992). Also known as the Watana Rainbow prospect.|
Geologic descriptionThis gold placer prospect is in alluvial gravel deposits that conceal a fault contact between Lower to Middle Jurassic amphibolite and Pennsylvanian(?) and Lower Permian basaltic and andesitic metavolcanic rocks (Csejtey and others, 1978). The gravel contains many large granitic boulders; this makes sampling and mining potentially difficult (Kurtak and others, 1992). Placer samples, which contain abundant magnetite, contain up to 0.0006 ounce of gold per cubic yard.
|Geologic map unit||(-147.959527180927, 62.7304351483545)|
|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 sampling by the U.S. Bureau of Mines (Kurtak and others, 1992).|
|Indication of production||None|
Additional commentsMAS/MILS number 20760047.
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||10/4/2002|