Unnamed (on Mount Harding)

Occurrence, Inactive

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