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  3. Alaska Resource Data File (ARDF)

Neil

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale A-4
Latitude 62.2272
Longitude -142.7283
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the northeast flank of the ridge between the west and middle forks of Bond Creek. It is at an elevation of about 4,800 feet, about 2,000 feet south of the junction of the middle and east forks of Bond Creek. The site is near the center of section 12, T. 5 N., R. 14 E. of the Copper River Meridian. This is National Park Service locality WRST-36 (unpublished data) and the coordinates for this prospect were provided by the National Park Service.

Geologic setting

Geologic description

An unpublished National Park Service map and accompanying database identify this locality as a copper prospect. The bedrock in this area is dominantly granitic rocks of the mid-Cretaceous Nabesna pluton (Richter, 1973). This pluton is locally intruded by dikes, small irregular bodies, and stocks of hornblende-plagioclase porphyry. This porphyry is considered to be Tertiary in age (Richter, 1973).
Geologic map unit (-142.730428491916, 62.2268146504522)
Mineral deposit model Porphyry Cu-Mo? (Cox and Singer, 1986; model 21a)
Mineral deposit model number 21a?
Age of mineralization Mid-Cretaceous? K/Ar ages for the Nabesna pluton range from 105 +/- 4.0 to 114 +/- 3.4 Ma (Richter and others, 1975; Richter, Lanphere, and Matson, 1975). Many varieties of hornblende-plagioclase porphyry form irregular intrusive bodies into the Nabesna pluton and other regional bedrock units in the area; the porphyry is considered to be Tertiary in age (Richter, 1973).

Production and reserves

Workings or exploration Some surface prospecting probably 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.
Richter, D.H., Singer, D.A., and Cox, D.P., 1975, Mineral resources map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-655-K, 1 sheet, scale 1:250,000.
Reporters Travis L. Hudson (Applied Geology)
Last report date 11/24/2002