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Rebo

Prospect, Inactive

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Commodities and mineralogy

Main commodities Au; Cu

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale B-4
Latitude 62.2687
Longitude -142.5202
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is near the winter trail west of Cooper Pass. It is at an elevation of about 5,300 feet, about 6,000 feet south of elevation 6376 (Cooper). The site is in the SW1/4 of section 30, T. 6 N., R. 16 E. of the Copper River Meridian. This is National Park Service locality WRST-38 (unpublished data) and the coordinates for this prospect were provided by the National Park Service.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An unpublished National Park Service map and accompanying database identify this prospect. Five lode claims for copper and gold were staked at this locality and were active from 1974 to 1980 (U.S. Bureau of Mines, 1994). The northern contact of the mid-Cretaceous Nabesna pluton (Richter, Lanphere, and Matson, 1975) intrudes Triassic limestone on the east-facing slopes about 2,000 feet southwest of this prospect (Richter, 1971 [I-656], 1976).
Geologic map unit (-142.522329563568, 62.2683263049997)
Mineral deposit model Cu skarn? (Cox and Singer, 1986; model 18b)
Mineral deposit model number 18b?
Age of mineralization Mid-Cretaceous? If the deposit is related to emplacement of the Nabesna pluton, it is mid-Cretaceous; K/Ar dates for the pluton range from 105 +/- 4.0 to 114 +/- 3.4 Ma (Richter, Lanphere, and Matson, 1975).

Production and reserves

Workings or exploration Some surface prospecting has occurred in this area.
Indication of production None

Additional comments

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

References

References

Richter, D.H., 1976, Geologic map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-932, 1 sheet, scale 1:250,000.
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.
U.S. Bureau of Mines, 1994, Mineral Information Location System Database: U.S Bureau of Mines Alaska Field Operations Center, Anchorage, Alaska.
Reporters Travis L. Hudson (Applied Geology)
Last report date 11/24/2002