|Quadrangle map, 1:250,000-scale||NB|
|Quadrangle map, 1:63,360-scale||A-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is 1,000 feet north of the summit of peak 5945 between two unnamed north tributaries to Horsfeld Creek. The site is at an elevation of about 5,700 feet, about 0.2 mile east of the center of section 7, T. 3 N., R. 23 E. of the Copper River Meridian. This is locality 6 of Richter and others (1973), locality 51 of Richter and others (1975), and National Park Service locality WRST-85. Cobb and Richter (1980) included this locality as an 'Unnamed occurrence'. It is located to within a few hundred feet.|
Geologic descriptionA 2-foot-wide quartz vein that contains chalcopyrite cuts volcanic breccia of the Cretaceous, Chisana Formation (Richter and others, 1973; 1975). A grab sample of the vein contained 0.04 parts per million (ppm) gold, 30 ppm silver, 10,000 ppm copper, 7,000 ppm lead, and 700 ppm zinc (Matson and Richter, 1971 [OFR 71-202]). This occurrence is about 5,000 feet northwest of the contact of the Chisana Formation and the mid-Cretaceous, Klein Creek pluton (Richter and others, 1973; Richter, Lanphere, and Matson 1975).
|Geologic map unit||(-141.262132951814, 62.053775456966)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c)|
|Mineral deposit model number||22c|
|Age of mineralization||Mid-Cretaceous? The mineralization may be related to emplacement of the Klein Creek pluton which has a K/Ar date of 111 +/- 3.6 Ma (Richter, Lanphere, and Matson, 1975).|
|Indication of production||None|
Additional commentsThe prospect is in the Wrangell-St. Elias National Preserve.
Matson, N.A., Jr., and Richter, D.H., 1971, Geochemical data from the Nabesna A-1 quadrangle, Alaska: U.S. Geological Survey Open-File Report 71-0202, 10 p.
Richter, D.H., Lanphere, M.A., and Matson, N.A., Jr., 1975, Granite plutonism and metamorphism, eeastern Alaska Range, Alaska: Geological Society of American Bulletin, v. 86, p. 819-820.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||11/24/2002|