|Quadrangle map, 1:250,000-scale||MM|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The contiguous Lena and Silver Wire claims (Cobb, 1980 [OFR 80-363]) are at an elevation of about 4200 feet on the southwest flank of Spruce Peak. They are about in the center of the SW1/4 SW1/4 section 29, T. 15 S., R. 16 W., Fairbanks Meridian. The location is accurate within 500 feet. It corresponds to number 266 of Hawley and Associates (1978), 22 of Cobb (1972 [MF 366]), 56a of Bundtzen, Smith, and Tosdal (1976), 60 of Bundtzen (1981), and 85 of Thornsberry, McKee, and Salisbury (1984).|
The country rock in the area of the Lena and Silver Wire claims, which probably have a common end line, is metafelsite of the lower Paleozoic Spruce Creek sequence. Graphitic phyllite, also of Spruce Creek affiliation, crops out southeast of the prospects. Both rock units strike NE and dip moderately to the NW, on the north flank of the Kantishna antiform (MM091) (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2, v. 2).The two claims probably are on a sulfide-bearing quartz vein that strikes about N30E. The vein is 2 to 3 feet thick and contains pyrite, galena, tetrahedrite, sphalerite, malachite, and native silver. Locally, it contains nearly 50 percent galena (Davis, 1923, p. 132). Selected samples from prospect pits assayed 0.27 to 0.48 ounce of gold per ton, 129.6 to 180.3 ounce of silver per ton, 36 to 52.5 percent lead, 1.45 to 8.20 percent zinc, and 0.15 to 0.66 percent copper (Moffit, 1933, p. 333; Thornsberry, McKee, and Salisbury, 1984, v. 2). The native silver, and the high silver and gold assays indicate supergene enrichment of the deposit.
|Geologic map unit||(-150.707983921263, 63.579399412666)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|Age of mineralization||The deposit is assumed to be Eocene (see record MM091).|
|Alteration of deposit||Oxidation of iron and copper minerals; supergene enrichment of silver and possibly gold.|
|Workings or exploration||The veins were discovered and prospected before 1922 (Davis, 1923). At the time of Moffit's visit in 1931, they were owned by C. A. Trudy, commissioner of the Kantishna district (Moffit, 1933). The claims were restaked in 1965 but were inactive in 1983. It appears that very little work was done after the initial prospecting.|
|Indication of production||Undetermined|
Additional commentsThe claims are in Denali National Park and Preserve and have been inactive for decades.
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., 1972, Metallic mineral resources map of the Mount McKinley quadrangle, Alaska: U. S. Geological Survey Miscellaneous Field Studies Map MF-366, 1 sheet, scale 1:250,000.
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.
Davis, J. A., 1923, The Kantishna region, Alaska, in Stewart, B. D., Annual Report of the Mine Inspector to the Governor of Alaska, 1922: Alaska Division of Geological and Geophysical Surveys AR-1922.
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).
Moffit, F.H., 1933, The Kantishna district, in Smith, P.S. and others, Mineral resources of Alaska: report on investigations in 1930, U. S. Geological Survey Bulletin 836, p. 301-338.
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||1/31/2001|