Nabob

Prospect, Inactive

Commodities and mineralogy

Main commodities Au; Cu

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale A-4
Latitude 62.1916
Longitude -142.5048
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 This is National Park Service locality WRST-41 (unpublished data) and the coordinates of this prospect were provided by the National Park Service.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 setting

Geologic description

An unpublished National Park Service map and accompanying database identify this as a copper-gold prospect, where 8 lode claims were active from 1972 to 1976.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).

Production and reserves

Workings or exploration At least surface prospecting has occurred here.
Indication of production None

Additional comments

The prospect is in the Wrangell-St. Elias National Preserve.

References

References

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