|Quadrangle map, 1:250,000-scale||MM|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The approximate location of this occurrence is on the south flank of Chitsia Mountain at an elevation of about 2800 feet. It probably is the NE1/4 of section 21, T. 11 S., R. 14 W., Fairbanks Meridian. The occurrence corresponds to number 75 of Bundtzen, Smith, and Tosdal (1976) and 85a of Bundtzen (1981).|
Geologic descriptionThe area of this occurrence is probably underlain by phyllite and porphyritic metarhyolite of the Upper Devonian and Mississippian Totatlanika Formation (Hawley and Associates, 1978, fig. 4.1-A(3); Bundtzen, 1981). The occurrence consists of limonitic gossan developed on pyritic metarhyolite and phyllite; small amounts of chalcopyrite are associated with the pyrite. Grab samples of the limonitic material contained up to 400 ppm each of copper and lead, and 500 ppm zinc. Gold was not detected, but three samples each assayed 0.01 ounce of silver per ton (Bundtzen, 1981, occurrence 85a, table 10). The occurrence is similar geologically to those at MM007 and MM009, which are also in the Totatlanika Formation.
|Geologic map unit||(-150.300028360854, 63.9502108057414)|
|Mineral deposit model||Stratabound sulfide deposit in metarhyolite.|
|Age of mineralization||Possibly Late Devonian or Mississippian, the depositional age of the Totatlanika Formation.|
|Alteration of deposit||Iron-oxide alteration.|
|Workings or exploration||The area has been reconnaissance mapped and sampled (Hawley and Associates, 1978, fig. 4.1-A(3); Bundtzen, 1981). There are no siginificant workings.|
|Indication of production||None|
Additional commentsThe occurrence 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.
Bundtzen, T.K., Smith, T.E., and Tosdal, R.M., 1976, Progress report--Geology and mineral deposits of the Kantishna Hills: Alaska Division of Geological and Geophysical Surveys Open-File Report AOF-98, 80 p., 2 sheets, scale 1:63,360.
|Last report date||5/7/2001|