|Quadrangle map, 1:250,000-scale||MC|
|Quadrangle map, 1:63,360-scale||B-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is near the ridge crest on the west side of the headwater cirque to Radovan Gulch (MacKevett and Smith, 1972). It is at an elevation of about 6,700 feet, 1,500 feet north of elevation 7850. The site is in the NW1/4 of section 28, T. 5 S., R. 17 E of the Copper River Meridian. This is locality 67 of MacKevett (1976) and it is accurately located. Cobb and MacKevett (1980) included it under the name 'Radovan'.|
Geologic descriptionThe deposit at this prospect consists of massive lenses, thin veins, and disseminations of chalcocite, pyrite, marcasite, bornite(?), and chalcopyrite in a basal unit of the dolomitic Triassic Chitistone Limestone (Miller, 1946; MacKevett, 1976). Samples of ore are reported to contain 7 to 10 percent copper (Eakins and others, 1983). The deposits have been explored by surface cuts and short underground workings. Copper mineralization is common in Nikolai Greenstone and overlying Chitistone Limestone. It is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).
|Geologic map unit||(-142.385655039112, 61.409777088102)|
|Mineral deposit model||Basaltic Cu (Cox and Singer, 1986; model 23) and/or Kennecott-type copper deposit (after MacKevett and others, 1997)|
|Mineral deposit model number||23?|
|Age of mineralization||Cretaceous? Copper mineralization is common in Nikolai Greenstone and overlying Chitistone Limestone. It is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).|
|Workings or exploration||The deposits have been explored by surface cuts and short underground. workings.|
|Indication of production||Yes; small|
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve.
Cobb, E.H., and MacKevett, E.M., Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the McCarthy quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-885, 156 p.
Eakins, G.R., Bundtzen, T.K., Robinson, M.S., Clough, J.G., Green, C.B., Clautice, K.H., and Albanese M.A., 1983, Alaska's mineral industry, 1982: Alaska Division of Geological and Geophysical Surveys Special Report 31, 63 p.
MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, 2 sheets, scale 1:250,000.
MacKevett, E.M., Jr., and Smith, J.G., 1972, Geologic map of the McCarthy B-4 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-943, 1 sheet, scale 1:63,360.
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.
|Reporters||Travis L. Hudson (Applied Geology, Inc.)|
|Last report date||1/12/2003|