Unnamed Prospect (ARDF - MM025; ridge northeast of Brooker Mountain), Kantishna District, Denali Borough, Alaska, USA
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Location: This prospect is at an elevation of about 3100 feet on the southeast- trending ridge about midway between Brooker Mountain and Alpha Ridge. It is in the SE1/4 section 21, T. 16 S., R. 18 W., Fairbanks Meridian. The location is accurate within 500 feet. The prospect corresponds to number 4 of Thornsberry, McKee, and Salisbury (1984).
Geology: The country rock at this prospect is feldspar-quartz-mica schist of the Birch Creek Schist (Bundtzen, 1981). Although the mineral deposit is not exposed, the distribution of float in relation to old pits and topography indicates that the deposit is a vein which strikes about EW and dips at a moderate or shallow angle to the south (Thornsberry, McKee, and Salisbury, 1984, v. 2, occurrence 4). A selected sample of sulfide-rich material in a pit assayed 144 ounces of silver per ton, 18 percent arsenic, and 45 percent antimony. It also contained 0.365 percent copper, 8.4 percent lead, and 3.75 percent zinc (Thornsberry, McKee, and Salisbury, 1984, v. 2). Some of the material contains about 50 percent stibnite. The high arsenic value indicates that arsenopyrite or its oxidation product scorodite is present.
Workings: The vein has been explored by several shallow pits of unknown date.
Age: The deposit is assumed to be Eocene (see record MM091).
Commodities (Major) - Ag, Sb; (Minor) - As, Au, Cu, Pb, Zn
Development Status: Undetermined.
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).
7 entries listed. 7 valid minerals.
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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. Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p. 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.