|Quadrangle map, 1:250,000-scale||RM|
|Quadrangle map, 1:63,360-scale||D-8|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Elephant Creek flows north to Wilson Creek from headwaters 1.7 miles east of the summit of Mount Okumiak. Placer mining may have taken place at least locally along about 2 miles of its length. The map site is at an elevation of about 350 feet in the southeast corner of sec. 35, T. 21 N., R. 69 W., of the Seward Meridian. This is locality 9 of Hoare and Cobb (1972, 1977).|
Geologic descriptionThe trail development along Elephant Creek suggests that placer gold mining may have taken place at least locally along about 2 miles of its length upstream from Wilson Creek (RM002). The placer gold was discovered in 1914, and hydraulic mining was under way by 1916. The gold is in modern stream deposits and is accompanied by minor scheelite (Joesting, 1942). Bedrock in the Elephant Creek drainage is sedimentary and igneous rocks of the Gemuk Group that are locally intruded by Mesozoic or Tertiary granitic rocks (Hoare and Coonrad, 1959). The sedimentary rocks include chert, siltstone, sandstone, and conglomerate, and the intrusive rocks include biotite quartz monzonite, diorite, gabbro, hornblende porphyry, and felsic rocks (Bull and Schneider, 1997).
|Geologic map unit||(-161.861376058163, 61.8602577973839)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Underground mining methods were used before 1916; hydraulic methods were used from 1916 intermittently until at least 1940.|
|Indication of production||Yes; small|
|MRDS Number||A013409; D002725|
Bull, Katharine, and Schneider, Craig, 1997, 1997 Summary report for Calista Corporation: Unpublished report prepared for Calista Corporation, Anchorage, 10 p., tables.
Hoare, J M., and Cobb, E.H., 1972, Metallic mineral resources map of the Russian Mission quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-444, 1 sheet, scale 1:250,000.
Hoare, J.M., and Cobb, E.H., 1977, Mineral occurrences (other than mineral fuels and construction materials) in the Bethel, Goodnews, and Russian Mission quadrangles, Alaska: U.S. Geological Survey Open-File Report 77-156, 98 p.
Hoare, J.M., and Coonrad, W.L., 1959, Geology of the Russion Mission quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-292, 1 sheet, scale 1:250,000.
|Reporters||Travis L. Hudson and Madelyn A. Millholland|
|Last report date||6/10/2001|