|Quadrangle map, 1:250,000-scale||OP|
|Quadrangle map, 1:63,360-scale||C-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Bear Creek is a small, northeast-flowing headwater tributary to Graham Creek. The coordinates are for the approximate midpoint of mining at Bear Creek, on a bench between Bear Creek and Cripple Creek in sec. 22, T. 22 S., R. 14 E., Kateel River Meridian. Bear Creek is locality 7 of Cobb (1972 [MF 367]). The location is accurate within 1/2 mile.|
The Bear Creek area is underlain by chert, argillite, and volcaniclastic rocks. The upper portion of Cripple Creek, a nearby tributary to Graham Creek, is underlain by volcanic graywacke and conglomerate. The headwaters of Cripple Creek drain a small monzonite pluton. The rocks along the lower part of Cripple Creek are chert, argillite, and volcaniclastic strata; in the upper part of the creek, these rocks are in fault contact with structurally overlying volcanic graywacke and conglomerate (Chapman and others, 1985).Mining along Bear Creek took place on a bench between Cripple and Bear creeks. Placer mining was intermittent from 1922 until 1961, and again from 1970 until at least 1991 (Brooks and Capps, 1924; Smith, 1939 [B 910-A]; Smith, 1942; White and Killeen, 1953; Cobb, 1972 [MF 367]; Cobb, 1973 [OFR 76-576]; Bundtzen and others, 1990; Bundtzen and others, 1992). The average fineness of gold is 901 (Metz and Hawkins, 1981). Production from Bear Creek prior to 1961 was at least 10,412 ounces of gold and 1,150 ounces of silver (Bundtzen and others, 1987).
|Geologic map unit||(-156.134183153312, 63.569287275914)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Workings or exploration||Placer mining was intermittent from 1922 until 1961, and again from 1970 until at least 1991(Brooks and Capps, 1924; Smith, 1939 [B 910-A]; Smith, 1942; White and Killeen, 1953; Cobb, 1972 [MF 367]; Cobb, 1973 [OFR 76-576]; Bundtzen and others, 1990; Bundtzen and others, 1992).|
|Indication of production||Yes; small|
|Production notes||Production from Bear Creek prior to 1961 was at least 10,412 ounces of gold and 1,150 ounces of silver (Bundtzen and others, 1987).|
Additional commentsSee also Cripple Creek (OP005).
|MRDS Number||A010750; A015005|
Brooks, A.H., and Capps, S.R., 1924, The Alaska mining industry in 1922: U.S. Geological Survey Bulletin 755-A, p. 1-56.
Bundtzen, T.K., Cox, B.C., and Veach, N.C., 1987, Heavy mineral provenance studies in the Iditarod and Innoko districts, western Alaska: Alaska Division of Geological and Geophysical Surveys Public-Data File 87-16, 25 p.
Bundtzen, T.K., Swainbank, R.C., Wood, J.E., and Clough, A.H., 1992, Alaska's mineral industry 1991: Alaska Division of Geological and Geophysical Surveys Special Report SR 46, 89 p.
Chapman, R.M., Patton, W.W., and Moll, E.J., 1985, Reconnaissance geologic map of the Ophir quadrangle, Alaska: U.S. Geological Survey Open-File Report 85-203, 19 p., 1 sheet, scale 1:250,000.
Cobb, E.H., 1972, Metallic mineral resources map of the Ophir quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-367, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction material) in the Iditarod and Ophir quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-576, 101 p.
Metz, P.A., and Hawkins, D.B., 1981, A summary of gold fineness values from Alaska placer deposits: University of Alaska, Fairbanks, Mineral Industry Research Laboratory Report No. 45, 56 p.
Smith, P.S., 1939, Mineral industry of Alaska in 1937: U.S. Geological Survey Bulletin 910-A, p. 1-113.
Smith, P.S., 1942, Mineral industry of Alaska in 1940: U.S. Geological Survey Bulletin 933-A, p. 1-102.
|Last report date||8/7/2001|