|Quadrangle map, 1:250,000-scale||TK|
|Quadrangle map, 1:63,360-scale||A-5|
|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).|
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).|
|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 commentsMAS/MILS number 20760038.
Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L, 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northern part of Anchorage quadrangle, and southwest part of Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 60 p., 1 sheet, scale 1:250,000.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
U.S. Bureau of Mines, 1973, Alaska 1:250,000-scale quadrangle map overlays showing mineral deposit locations, principal minerals, and number and type of claims: U.S. Bureau of Mines Open-File Report 20-73, 95 overlays (updated in 1986, 1987).
|Reporters||R.K. Rogers (U. S. Geological Survey contractor)|
|Last report date||10/1/2002|