|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 Silver Pick prospect (Cobb, 1980 [OFR 80-363]) is at an elevation of about 2700 feet on the southeast flank of Quigley Ridge, just below the crest of the ridge. The location is about 500 feet northeast of the common endline between the Silver Pick and Silver Pick No. 2 claims. It is probably accurate within 300 feet.The Silver Pick prospect is included with the Little Maud prospect (MM119) in location 8 of Cobb (1972 [MF 366]), and in location 6 of MacKevett and Holloway (1977). It is included with the Darling unpatented claim in location 23 of Bundtzen (1981); and corresponds to patented claim 18 of Hawley and Associates (1978), and to occurrence 32 of Thornsberry, McKee, and Salisbury (1984).
The area of the Silver Pick and Silver Pick No. 2 claims is underlain by graphitic phyllite, quartz schist, and quartz-mica phyllite or semischist of the Spruce Creek sequence (Seraphim, 1962; Hawley and Associates, 1978, fig. 4.1-A(1)-3; Bundtzen, 1981).
At least three veins that strike northeast are exposed on the Silver Pick claims. A S30E crosscut tunnel whose portal is on the adjacent Little Maud claim (MM119) intersected the 3 veins, one of which is probably about on the side line between the Little Maud and Silver Pick claims. The strongest vein was intersected at 165 feet in the crosscut; it strikes N 65 E, and dips 67 SE (Capps, 1919, p. 105; Davis , 1923, p. 125-126). The vein is about 13 feet thick. It consists of about a foot of calcite and 12 feet of quartz and siderite containing arsenopyrite, pyrite, sphalerite, galena, and tetrahedrite (Bundtzen, Smith, and Tosdal, 1976, occurrence 21). This vein may correlate with a vein exposed at the surface (Seraphim, 1962; Bundtzen, 1981). Another intersected vein consists mainly of quartz containing some galena and sparse free gold. In near-surface exposures, the arsenopyrite is largely oxidized to scorodite, and the iron minerals are altered to melanterite.One sample of the principal vein assayed about 25 ounces of silver per ton, 3.05 percent lead, and 7.65 percent zinc (Thornsberry, McKee, and Salisbury (1984, v. 2, occurrence 32). Moffit (1933, p. 330) reported assays of as much as 300 ounces of silver per ton in some galena-rich vein material.
|Geologic map unit||(-150.95478627269, 63.5382935205463)|
|Mineral deposit model||Polymetallic vein (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||Silicification. Near-surface oxidation of arsenic and iron minerals.|
|Workings or exploration||The Silver Pick deposit was discovered before 1918 (Capps, 1919) in a crosscut adit driven from the adjacent Little Maud claim (MM119). It was extensively explored in 1960-61 by Moneta-Porcupine (Seraphim, 1962). In 1983, the U.S. Bureau of Mines drilled one core hole (K-7). The hole, drilled northwesterly, intersected a gougy, mineralized zone between 128 and 169 feet, but only about 10 percent of the core in the mineralized interval was recovered, and its grade is unknown (Thornsberry, McKee, and Salisbury, 1984, v. 2, occurrence 32, drill logs).|
|Indication of production||None|
Additional commentsThe claims are 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., 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).
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.
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.
Seraphim, R.H., 1962, Kantishna District: Alaska Division of Mines and Minerals Miscellaneous Report 193-3, 11 p., 10 sheets.
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||2/10/2001|