|Quadrangle map, 1:250,000-scale||VA|
|Quadrangle map, 1:63,360-scale||C-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||These prospects are on the saddle between the heads of Five Sheep and Deception Creeks (Moffit and Maddren, 1909, p. 64); it is at an elevation of about 5,000 feet in the SW1/4 section 27, T. 2 S., R. 7 E., of the Copper River Meridian. These prospects are approximately located, probably to within one-quarter mile. They are included in locality 63 of Cobb and Matson (1972) and included in locality 54 of Winkler and others (1981 [OFR 80-892-B]). Cobb (1979 [OFR 79-1241]) incuded these prospects under the name 'Elliot Cr.'.|
Geologic descriptionThin veins, films, and disseminations of bornite, chalcocite, and pyrite cut Triassic Nikolai Greenstone in this area (Moffit and Maddren, 1908, 1909; Moffit and Mertie, 1923). The gangue minerals are commonly quartz, calcite and epidote; secondary copper minerals include malachite, azurite, and some chalcanthite. Some mineralization occurs as irregular pods in greenstone. The Nikolai Greenstone and overlying Chitistone Limestone are deformed into a large, asymmetric anticline with its axis approximately parallel to Elliot Creek. The copper mineralization is believed to be related to the regional mineralizing event that produced the rich Kennecott copper deposits in the McCarthy quadrangle (MacKevett and others, 1997).
|Geologic map unit||(-144.126896024021, 61.6647329422254)|
|Mineral deposit model||Thin veins, impregnations, and fracture fillings in greenstone; probably related to Kennecott-type copper deposits (Mackevett and others, 1997)|
|Age of mineralization||The copper mineralization is believed to be related to the mineralizing event that produced the rich Kennecott copper deposits in the McCarthy quadrangle to the east (MacKevett and others, 1997). This event is interpreted to have accompanied Late Jurassic or Early Cretaceous deformation and metamorphism (MacKevett and others 1997, p. 88).|
|Workings or exploration||Some small open cuts are probably present.|
|Indication of production||None|
Additional commentsThis prospect is within the Wrangell-St. Elias National Park.
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.
MacKevett, E.M., Jr., Cox, D.P., Potter, R.W., III, and Silberman, M.L., 1997, Kennecott-type deposits in the Wrangell Mountains, Alaska--High-grade copper ores near a basalt-limestone contact, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska: Economic Geology Monograph 9, p. 66-89.
Moffit, F.H., and Maddren, A.G., 1908, The mineral resources of the Kotsina and Chitina valleys, Copper River region: U.S. Geological Survey Bulletin 345-C, p. 127-175.
Moffit, F.H., and Maddren, A.G., 1909, Mineral resources of the Kotsina-Chitina region, Alaska: U.S. Geological Survey Bulletin 374, 103 p.
Moffit, F.H., and Mertie, J.B., Jr., 1923, The Kotsina-Kuskulana district, Alaska: U.S. Geological Survey Bulletin 745, 149 p.
|Reporters||Travis L. Hudson|
|Last report date||12/14/2001|