1. Mineral Resources
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  3. Alaska Resource Data File (ARDF)

Unnamed (on Mount Harding)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Cu
Ore minerals chalcopyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SK
Quadrangle map, 1:63,360-scale B-2
Latitude 59.42
Longitude -135.43
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is near the summit of Mount Harding on its northeast side. It is in the northeast corner of section 30, T. 28 S., R. 59 E. of the Copper River Meridian. It is shown as mineral occurrence 9 on sheet 1 of Redman and others (1984) and as map number S076 by Wells and others (1986).

Geologic setting

Geologic description

The following description is from Redman and others (1989). Small, up to 2.5-inch-long, massive pods of pyrrhotite with traces of chalcopyrite in quartz are associated with a fault zone which cuts high grade paragneiss and the Late Cretaceous to early Paleocene, Ferebee pluton. A sample of the pyrrhotite contained 555 ppm copper and 3.1 ppm silver. The Late Cretaceous to early Paleocene age of the Ferebee pluton establishes a maximum age for the mineralization.
Geologic map unit (-135.431828823515, 59.4196727535689)
Mineral deposit model Pods of cupriferous, massive sulfides in a fault zone (Redman and others, 1984).
Age of mineralization Late Cretaceous or younger, based on the age of the Ferebee pluton (Redman and others, 1984).

Production and reserves

Indication of production None

References

MRDS Number A013106

References

Redman, E.C., Retherford, R.M., and Hickok, B.D., 1984, Geology and geochemistry of the Skagway B-2 Quadrangle, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 84-31, 34 p., 4 sheets, scale 1:40,000.
Wells, D.E., Pittman, T.L., Brew, D.A. and Douglass, S.L., 1986, Map and description of the mineral deposits in the Juneau, Taku River, Atlin, and part of the Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-717, 332 p., 1 sheet, scale 1:250,000.
Reporters T.C. Crafford (T. Crafford & Associates, Anchorage)
Last report date 2/4/2001