Rainy Creek Ridge No. 1 Prospect, Kantishna District, Denali Borough, Alaska, USA
The prospect is in Denali National Park and Preserve.
Location: The Rainy Creek Ridge No. 1 prospect is at an elevation of about 3550 feet in a saddle on the ridge between the East Fork of Glen Creek and Spruce Creek. It is in the SE1/4 SE1/4 section 31, T. 15 S., R. 16 W., Fairbanks Meridian. The site corresponds to the location of rock sample 254 of Hawley and Associates (1978), and possibly to location 54 of Bundtzen, Smith, and Tosdal (1976) and 59a of Bundtzen (1981). It is about 0.25 mile south of Thornsberry, McKee, and Salisbury's (1984) occurrence 83, which includes the Rainy Creek Ridge No. 1 and No. 2 claims. The location is accurate within 500 feet of Hawley and Associates' (1978) sample site, but it is uncertain whether it actually coincides with the Rainy Ridge No. 1 claim.
Geology: This deposit appears to be on the trace of a nearly vertical fault(?) contact between Birch Creek Schist and Spruce Creek rocks. The contact crosses the ridge between upper Glen and Spruce Creeks; locally, it is intruded by Tertiary mafic dikes (Hawley and Associates, 1978, fig. 4.1-A(1); Thornsberry, McKee, and Salisbury, 1984, fig. K-2). The deposit consists of a mineralized quartz-carbonate vein in silicified schist. The vein is 4 to 15 feet thick, and strikes N75-85E. It contains arsenopyrite and pyrite, along with minor amounts of stibnite and galena, and possibly a trace of sphalerite. It can be traced discontinuously along strike for about 2500 feet. The maximum grade of a representative chip sample was 0.01 ounce of gold per ton, 1.79 ounces of silver per ton, 2.53 percent arsenic, 0.42 percent antimony, 0.38 percent lead, and 0.043 percent zinc (Bundtzen, 1981, occurrence 59a).
Workings: The claim is unpatented and there are no workings.
Age: The vein is along or subparallel to a fault(?) contact that contains mafic dikes of Eocene age. The deposit is assumed to be Eocene (see record MM091).
Commodities (Major) - Ag, Au; (Minor) - As, Pb, Sb, Zn
Development Status: None
Deposit Model: Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
ReferencesBundtzen, 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. 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). 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.
6 entries listed. 6 valid minerals.
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Locality Updated: Buarcos, Figueira da Foz, Coimbra District, PortugalFrom Rui Nunes, 1st Sep 2014 13:01:46