|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||This prospect is located near lower Benito Creek; it is at an elevation of 2,600 feet in the SE1/4 section 9, T. 3 S., R. 7 E., of the Copper River Meridian. This prospect is approximately located, perhaps to within 1 mile. It is locality 74 of Cobb and Matson (1972) and locality 59 of Winkler and others (1981 [OFR 80-892-B]). Cobb (1979 [OFR 79-1241]) incuded this prospect under the name 'Elliot Cr.'.|
Geologic descriptionQuartz-calcite veins in mafic intrusive and metavolcanic rocks of the Paleozoic Skolai Group contain bornite, chalcopyrite, arsenopyrite, pyrite, and free gold. Secondary minerals include local malachite and azurite stains. The principal vein is 2 to 3 feet wide, strikes northwest, and dips steeply to the southeast (Moffit, 1921; Moffit and Mertie, 1923, p. 142-143). This vein has been traced over a distance of about 600 feet by five shallow holes and several open cuts produced by sluicing. It is extensively oxidized and gossanous at the surface. Other veins are present nearby, one of which may contain specular hematite. The Skolai Group is locally intruded by mafic to intermediate Jurassic plutons in this area. The veins postdate the Paleozoic Skolai Group and appear to postdate the Late Jurassic or Early Cretaceous deformation and metamorphism in the region (Winkler and others, 1981 [OFR 80-892-A; MacKevett and others, 1997).
|Geologic map unit||(-144.146094285733, 61.6168315194598)|
|Mineral deposit model||Polymetallic veins? (Cox and Singer, 1986; model 22c)|
|Mineral deposit model number||22c?|
|Age of mineralization||The veins postdate the Paleozoic Skolai Group and appear to postdate the Late Jurassic or Early Cretaceous deformation and metamorphism in the region (Winkler and others, 1981 [OFR 80-892-B]; MacKevett and others, 1997).|
|Alteration of deposit||Oxidized; extensive development of iron oxides near the surface.|
|Workings or exploration||The principal vein at this prospect has been traced over a distance of about 600 feet by five shallow holes and several open cuts produced by sluicing.|
|Indication of production||Undetermined|
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., 1921, Mining in the Chitina valley: U.S. Geological Survey Bulletin 714-C, p. 189-196.
Moffit, F.H., and Mertie, J.B., Jr., 1923, The Kotsina-Kuskulana district, Alaska: U.S. Geological Survey Bulletin 745, 149 p.
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|