|Quadrangle map, 1:250,000-scale||DN|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||
This occurrence is at an elevation of about 4450 feet about 1000 feet northwest of the top of Kankone Peak. It is about at the center of the S1/2 SW1/4 section 11, T. 15. S., R. 16 W., Fairbanks Meridian. The location is accurate within 300 feet.The occurrence corresponds to number 61 of Bundtzen, Smith, and Tosdal (1976), 23 of MacKevett and Holloway (1977), 291 of Hawley and Associates (1978), and 68 of Bundtzen (1981), and is referred to in Cobb (1980 [OFR80-363]). It is at the same location as occurrence 99 of Thornsberry, McKee, and Salisbury (1984, fig. K-8), but their description of the geology does not agree with that of Bundtzen, Smith, and Tosdal, and of Hawley and Associates.
Stratabound, disseminated and semimassive sulfides occur in layers of greenstone schist of the upper Precambrian Birch Creek Schist. The greenstone schist strikes NE and dips moderately to the SE, off the Kantishna antiform (DN091) (Bundtzen, Smith, and Tosdal, 1976; Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2).The sulfide-bearing zone is parallel to the schistosity of the host greenstone, and is 4 to 6 feet thick. It contains pyrite, chalcopyrite, azurite, and malachite. Samples assayed up to 1.02 percent copper and 1.19 ounces of silver per ton (Hawley and Associates, 1978, fig. and table 4.1-A(1)). The stratabound zone is cut by fracture-controlled, sulfide-bearing veinlets. A sample of these veinlets assayed 0.91 ounce of silver per ton, and 6000 to 6900 ppm each of lead and zinc, suggesting that the veinlets contain galena and sphalerite (Bundtzen, 1981).
|Geologic map unit||(, )|
|Mineral deposit model||Stratabound mineral deposit in greenschist. Polymetallic veins (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|Age of mineralization||Possibly late Precambrian, the protolith age of the Birch Creek Schist. The deposit could be younger, but is pre-metamorphic. The stratabound deposit is cut by sulfide veinlets assumed to be Eocene (see record DN091).|
|Alteration of deposit||Oxidation of copper minerals.|
|Workings or exploration||The occurrence was discovered in the mid-1970s (Bundtzen, Smith, and Tosdal, 1976). There are no 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.
Cobb, E.H., 1980, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount McKinley quadrangle, Alaska: U. S. Geological Survey Open-File Report 80-363, 150 p.
Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p.
Hawley, C. C. and Associates, Inc, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U. S. Bureau of Mines Open-File Report 24-78, 275 p. (paged by sections).
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.
Thornsberry, V. V., McKee, C. J., and Salisbury, W. G., eds, 1984, 1983 Mineral Resource Studies: Kantishna Hills and Dunkle Mine Areas, Denali National Park and Preserve, Alaska: U. S. Bureau of Mines Open-File Report 129-84. 3 Volumes: v. 1, Text; v. 2, Appendices; v. 3, Maps. Prepared by Salisbury & Dietz, Inc., Spokane, WA.
|Last report date||5/5/2001|