|Quadrangle map, 1:250,000-scale||MC|
|Quadrangle map, 1:63,360-scale||D-8|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is on the ridge east of upper Fall Creek. It is at an elevation of about 5,600 feet, 1,000 feet northeast of peak 6050. The site is in the NW1/4 of section 12, T. 1 S., R. 8 E. of the Copper River Meridian. This is locality 182 of MacKevett (1976); the location is accurate to within 1,000 feet. Cobb and MacKevett (1980) included this prospect under the name 'Fall Cr.'.|
Geologic descriptionThe deposit at this prospect consists of bornite and chalcocite in thin veins, and native copper and chalcocite that fill amygdules in Triassic Nikolai Greenstone (Moffit and Mertie, 1923, p. 114; MacKevett, 1976). Quartz accompanies some copper mineralization. A short adit and surface open cuts explored this prospect. Copper mineralization is common in Nikolai Greenstone and 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||(-143.888097954974, 61.8020438966955)|
|Mineral deposit model||Basaltic Cu (Cox and Singer, 1986; model 23)|
|Mineral deposit model number||23|
|Age of mineralization||Cretaceous? Copper mineralization is common in Nikolai Greenstone and 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||A short adit and surface open cuts explored this prospect.|
|Indication of production||None|
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.
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., 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|