Mary Ellen

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale A-2
Latitude 62.0882
Longitude -141.5155
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is in the headwater cirque to an unnamed south tributary to Klein Creek. It is at an elevation of about 6,900 feet, about 1,500 feet southeast of peak 7730. The site is in the SW1/4 of section 26, T. 4 N., R. 21 E. of the Copper River Meridian. This is National Park Service locality WRST-73 (unpublished data) and the coordinates for this record were provided by the National Park Service.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An unpublished National Park Service map and accompanying database identify this locality as a copper, silver, gold, and lead prospect where 6 lode claims were active from 1972 to 1981. The prospect is near the northwest contact of the Klein Creek pluton with Jurassic or Cretaceous siliciclastic rocks (Richter and Jones, 1973). The Klein Creek pluton varies from gabbro to granodiorite and has concordant biotite/hornblende K/Ar ages of 111 +/- 3.6 Ma (Richter, Lanphere, and Matson, 1975).
Geologic map unit (-141.517637214292, 62.0878626381967)
Age of mineralization Mid-Cretaceous? The deposit is probably related to emplacement of the Klein Creek pluton which has concordant biotite/hornblende K/Ar ages of 111 +/- 3.6 Ma (Richter, Lanphere, and Matson, 1975).

Production and reserves

Workings or exploration Six lode claims were active in this area from 1972 to 1981 and at least some surface prospecting has taken place.
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