|Quadrangle map, 1:250,000-scale||TK|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This placer prospect is on Roaring Creek, it extends upstream from a point about 1.25 miles from its mouth on the Oshetna River. The location is accurate to within a 1/4 mile. This is locality 60 of Csejtey and Miller (1978).|
Gold in Roaring Creek occurs in Tertiary(?) stream and bench, alluvial deposits that overlie Tertiary volcanic rocks (Csejtey and others, 1978). The creek drains Jurassic quartz diorite, Talkeetna Formation volcanic rocks, sandstone, and argillite, and Tertiary fluviatile conglomerate. The gravel deposits are up to 200 feet wide and 20 feet thick. The stream gradient ranges from 150 to 500 feet per mile (Kurtak and others, 1992). Stream-sediment samples contain up to 4.5 parts per million gold (Balen, 1990) and 115 parts per million zinc (Kurtak and others, 1992).Multiple placer claims are located along lower Roaring Creek. 'Encouraging' prospects were described by Chapin (1918). Black Creek Mining Company held mining claims in 1990.
|Geologic map unit||(-147.919586505339, 62.2573263755798)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Tertiary?|
|Workings or exploration||Multiple placer claims are located along lower Roaring Creek. 'Encouraging' prospects were described by Chapin (1918). Limited stream sampling by the U.S. Bureau of Mines (Balen, 1990; Kurtak and others, 1992). Black Creek Mining Company held mining claims in 1990.|
|Indication of production||Undetermined|
|Reserve estimates||Roaring Creek contains an estimated 500,000 cubic yards of potentially auriferous gravel (Kurtak and others, 1992). No estimate of grade has been made.|
Additional commentsMAS/MILS number 20760019.
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.
Chapin, Theodore, 1915, Auriferous gravels of the Nelchina-Susitna region: U.S. Geological Survey Bulletin 622-D, p. 118-130.
Chapin, Theodore, 1918, The Nelchina-Susitna region, Alaska: U.S. Geological Survey Bulletin 668, 67 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-370, 1 sheet, scale 1:250,000.
Cobb, E.H., and Csejtey, Bela, Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-716, 63 p.
Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and table describing metalliferous and selected nonmetalliferous mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-B, 22 p., 1 sheet, scale 1:250,000.
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.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
|Reporters||R.K. Rogers (U. S. Geological Survey contractor)|
|Last report date||10/2/2002|