Unnamed (overlooking Middle Fork of Kuskokwim River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag
Other commodities Fe; Mo
Ore minerals molybdenite; pyrite
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale A-3
Latitude 62.228
Longitude -154.45
Nearby scientific data Find additional scientific data near this location
Location and accuracy The unnamed occurrence is located in a low saddle overlooking the Middle Fork of the Kuskokwim River at an elevation of 3,000 feet (915 m) in the SW1/4 sec. 27, T. 25 N., R. 28 W., of the Seward Meridian. The reporter visited the site in 1998 at station no. 98BT440.

Geologic setting

Geologic description

This unnamed occurrence is a skarn zone developed in a highly sheared limestone of Late Triassic age, a part of the Mystic subterrane (Gilbert and others, 1988; Bundtzen, Harris, and Gilbert, 1997). Massive pyrite bands averaging 8 centimeters in thickness occur in association with epidote-quartz gangue within a 10 meter wide skarn zone near a gabbro-diorite sill. One grab sample contained 10.75 percent iron, 100 ppm molybdenum, and 1.25 grams/tonne silver (T.K. Bundtzen and G.M. Laird, written communication, 1998).
Geologic map unit (-154.452238078946, 62.2273672141037)
Mineral deposit model Iron-rich skarn (Cox and Singer, 1986; model 18a).
Mineral deposit model number 18a

Production and reserves

Workings or exploration This unnamed occurrence was investigated in 1998. One grab sample contained 10.75 percent iron, 100 ppm molybdenum, and 1.25 grams/tonne silver (T.K. Bundtzen and G.M. Laird, written communication, 1998).
Indication of production None
Reserve estimates None.

References