|Quadrangle map, 1:250,000-scale||VA|
|Quadrangle map, 1:63,360-scale||B-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Placer prospecting and some mining occurred along several miles of Fall Creek (including portions in the Valdez B-3 quadrangle). The map coordinates are about the midpoint of mining in the NW1/4 section 30, T. 5 S., R. 2 E., of the Copper River Meridian. This is locality 87 of Cobb and Matson (1972) and locality 67 of Winkler and others (1981 [OFR 80-892-B]).|
Geologic descriptionPlacer gold, much of which is rounded and coarse, occurs on and in bedrock along Fall Creek and adjacent low benches (Schrader and Spencer, 1901; Moffit, 1918; Mulligan, 1974). About 6 miles of Fall Creek have been prospected, and small amounts of gold were recovered between 1899 and 1916. Bedrock in Fall Creek is greenschist-facies metaflysch of the Late Cretaceous Valdez Group (Winkler and others, 1981 [OFR 80-892-A]). Gold-bearing quartz veins are widespread through the Valdez Group in the southern Valdez quadrangle (Cobb and Matson, 1972).
|Geologic map unit||(-145.127983753566, 61.4042120264936)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Holocene.|
|Workings or exploration||Small-scale surface mining and prospecting occurred along Fall Creek between 1898 and 1916 (Cobb, 1979 [OFR 79-1241]).|
|Indication of production||Yes; small|
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Valdez quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1241, 167 p.
Cobb, E.H., and Matson, N.A., Jr., 1972, Metallic mineral resources map of the Valdez quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-438, 1 sheet, scale 1:250,000.
Moffit, F.H., 1918, Mining in the lower Copper River basin: U.S. Geological Survey Bulletin 662-C, p. 155-182.
Mulligan, J.J., 1974, Mineral resources of the Trans-Alaska Pipeline corridor: U.S. Bureau of Mines Information Circular 8626, 24 p., 9 sheets, scale 1:250,000.
Schrader, F.C., and Spencer, A.C., 1901, The geology and mineral resources of a portion of the Copper River District, Alaska: U.S. Geological Survey, 100 p., 5 sheets.
Winkler, G.R., Miller, R.J., MacKevett, E.M., Jr., and Holloway, C.D., 1981, Map and summary table describing mineral deposits in the Valdez quadrangle, southern Alaska: U.S. Geological Survey Open-File Report 80-892-B, 2 sheets, scale l:250,000.
|Reporters||Travis L. Hudson|
|Last report date||12/14/2001|