|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 at the head of Dan Creek (MacKevett and Smith, 1972). It is at an elevation of about 4,000 feet, 5,100 feet west-northwest of Joshua Green Peak, and 4,000 feet east-southeast of Nikolai Butte. The site is in the SW1/4 of section 6, T. 6 S., R. 17 E. of the Copper River Meridian. This is locality 54 of MacKevett (1976); the location is accurate to within a few hundred feet.|
Geologic descriptionThe deposit at this prospect consists of scattered veins up to 5 centimeters wide that contain chalcocite, pyrrhotite, covellite and malachite along joints in Triassic Nikolai Greenstone (MacKevett, 1976). A sample of the veins contained 30 parts per million (ppm) silver and more than 20,000 ppm copper (MacKevett and Smith, 1968, sample 53). The deposit was explored by a 15-foot-long adit (MacKevett, 1976). 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||(-142.434151179473, 61.3742736835665)|
|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).|
|Alteration of deposit||Oxidation.|
|Workings or exploration||The deposit was explored with a 15-foot-long adit (MacKevett, 1976).|
|Indication of production||None|
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve.
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., 1968, Distribution of gold, copper, and some other metals in the McCarthy B-4 and B-5 quadrangles, Alaska: U.S. Geological Survey Circular 604, 25 p.
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|