|Quadrangle map, 1:250,000-scale||DN|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This site represents two geologically similar occurences that are about 0.2 mile apart. The western occurrence is at an elevation of about 2250 feet; the eastern occurrence is at an elevation of about 2400 feet. For this record, the location is at an elevation of 2200 feet, about 0.4 mile east of the center of section 10, T. 13 S., R. 15 W., Fairbanks Meridian. The site corresponds to the location of sample numbers 67 and 71 of Hawley and Associates (1978).|
Geologic descriptionThis record describes two occurrences of sulfide-bearing schist, about 0.2 mile apart, in siliceous units of the Devonian or Mississippian Keevy Peak Formation (Bundtzen, 1981). In the area of the occurrences, the strata strike NE, and dip steeply (Hawley and Associates, 1978, fig. 4.1-A(2)). The occurrence at Hawley and Associates' location 67 consists of weakly pyritic siliceous schist. In addition to pyrite, the schist probably contains sphalerite and small amounts of other sulfide minerals. A sample assayed 0.1 ppm gold, 2.4 ppm silver, 215 ppm copper, 95 ppm lead, and 1000 ppm zinc. Hawley and Associates' location 71 is in sulfide-bearing metachert. A sample assayed 4.0 ppm silver, 315 ppm copper, 20 ppm lead, and 520 ppm zinc. The occurrences are stratabound, and may be Devonian or Mississippian, the depositional age of the Keevy Peak Formation.
|Geologic map unit||(, )|
|Mineral deposit model||Stratabound; syngenetic; possibly volcanogenic.|
|Age of mineralization||Probably Devonian or Mississippian, the protolith age of the Keevy Peak Formation.|
|Alteration of deposit||Sulfidization of schist and metachert hostrocks.|
|Workings or exploration||The occurrences were sampled during reconnaissance mapping of the area (Hawley and Associates, 1978). There are no workings.|
|Indication of production||None|
Additional commentsThe site is in Denali National Park and Preserve.
Bundtzen, T. K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p.
|Last report date||5/8/2001|