Unnamed (east, southeast of Mankomen Lake)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Fe
Ore minerals magnetite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale GU
Quadrangle map, 1:63,360-scale D-1
Latitude 62.937
Longitude -144.315
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is at an elevation of approximately 4,500 feet, about 6.4 miles east, southeast of the east end of Mankomen Lake. The occurrence is in the center of section 5, T. 13 N., R. 6 E., Copper River Meridian. It is probably accurate within 500 feet.

Geologic setting

Geologic description

WGM Inc. (1979, fig. 6) reported an occurrence of magnetite and pyrite associated with the contact of the border phase of the Brimstone granite and the Pennsylvanian to Permian, Tetelna volcanics. A chilled zone of altered potassium-feldspar-rich rocks contains bands of disseminated pyrite and magnetite.
Geologic map unit (-144.317215870736, 62.9366065860381)
Mineral deposit model Skarn?
Alteration of deposit Related to a contact zone of a granitic body.

Production and reserves

Indication of production None

Additional comments

Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.

References

MRDS Number 10307493

References

WGM Inc., 1979, 1978 Annual Progress Report, Uranium Exploration, Ahtell Creek Area, Volume I: WGM Inc., 39 p., appendices, 4 maps. (Report available, Ahtna Mineral Co., Anchorage, Alaska).
Reporters W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (U.S. Geological Survey)
Last report date 12/7/2000