Gunsite

Prospect, Active?

Commodities and mineralogy

Main commodities Cu
Other commodities Au
Ore minerals bornite; chalcopyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale A-5
Latitude 62.1363
Longitude -149.2603
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Gunsite prospect is at an elevation of about 3,500 feet on the south valley wall of upper Sheep Creek, near the divide with the head of the North Fork, Kashwitna River. The prospect is in the SW1/4 sec. 15, T. 23 N., R. 1 E., Seward Meridian. The location is accurate to within 1/4 mile. This is locality 35 of MacKevett and Holloway (1977).

Geologic setting

Geologic description

The Gunsite prospect is in Tertiary or Cretaceous granodiorite and quartz diorite that intrudes mafic igneous rocks (Csejtey and others, 1978). The deposit consists of chalcopyrite and bornite in, and adjacent to, northwest-striking, southwest-dipping quartz veins in altered granodiorite (W. Ellis, written communication, 2001). High gold values reportedly are associated with the veins. Alteration of the granodiorite ranges from slight to intense sericitization, with associated chloritization.
Exploration is limited to surface examinations. As of January 1, 2000, a large block of state mining claims and prospecting sites covered this prospect (Northern Associates Inc., written communication, 2001).
Geologic map unit (-149.262515691459, 62.1357912574238)
Mineral deposit model Porphyry Cu-Au? or Polymetallic vein? (Cox and Singer, 1986; model 20c or 22c)
Mineral deposit model number 20c? or 22c?
Age of mineralization Probably Cretaceous or younger; associated or cuts granitic rocks of that age.
Alteration of deposit Alteration of the granodiorite ranges from slight to intense sericitization, with associated chloritization (W. Ellis, written communication, 2001).

Production and reserves

Workings or exploration Exploration is limited to surface examinations. As of January 1, 2000, a large block of state mining claims and prospecting sites covered this prospect (Northern Associates Inc., written communication, 2001).
Indication of production None

Additional comments

MAS/MILS number 20760038.

References