|Quadrangle map, 1:250,000-scale||NB|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is about 2,500 feet downstream of the terminus of the glacier at the head of William Creek. This is close to the east boundary of the Nabesna A-4 quadrangle in the SE1/4 of section 19, T. 5 N., R. 16 E. of the Copper River Meridian. This is National Park Service locality WRST-41 (unpublished data) and the coordinates of this prospect were provided by the National Park Service.|
Geologic descriptionAn unpublished National Park Service map and accompanying database identify this as a copper-gold prospect, where 8 lode claims were active from 1972 to 1976. It is near the contact between granitic rocks of the mid-Cretaceous, Nabesna pluton and Triassic, Nikolai Greenstone (Richter, 1973). A sample of garnet skarn collected about 1 mile south of the site and just inside the boundary of the Nabesna A-3 quadrangle contained 1.2 parts per million (ppm) gold, 10 ppm silver, more than 20,000 ppm copper, and 1,500 ppm nickel (Richter and Matson, 1969).
|Geologic map unit||(-142.506928750693, 62.1912200301588)|
|Age of mineralization||Mid-Cretaceous? If this deposit is related to emplacement of the Nabesna pluton, it is mid-Cretaceous in age; K/Ar dates for this pluton range from 105 +/- 4.0 to 114 +/- 3.4 Ma (Richter, Lanphere, and Matson, 1975).|
|Workings or exploration||At least surface prospecting has occurred here.|
|Indication of production||None|
Additional commentsThe prospect is in the Wrangell-St. Elias National Preserve.
Richter, D.H., and Matson, N.A., Jr., 1969, Geochemical data from the Nabesna A-3 quadrangle, Alaska: U.S. Geological Survey Open-File Report 69-223, 5 p., 1 sheet, scale 1:63,360.
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|