|Quadrangle map, 1:250,000-scale||TN|
|Quadrangle map, 1:63,360-scale||B-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of 2,400 feet, on a small southern spur of Elephant Mountain west of Elephant Gulch. The site is at Alaska Division of Geological and Geophysical Surveys (ADGGS) sample station 97KC080 (Liss and others, 1998), on the boundary between sections 16 and 21, T. 5 N., R. 12 W., of the Fairbanks Meridian. The location is accurate within 500 feet.|
Elephant Mountain is underlain by Cretaceous granite that intrudes Jurassic or Cretaceous quartzite, sandstone, siltstone, and shale (Chapman and others, 1982; Reifenstuhl and others, 1997 [RI 97-15a]). The Elephant Mountain pluton is one of several 90 Ma alkalic plutons that crop out in the eastern Tanana, central Livengood, and western Circle quadrangles. It apparently is a northeast-trending, dike-like body about a mile wide and 5 miles long in outcrop, cut off by high-angle faults at its northeastern and southwestern ends (Reifenstuhl and others, 1997 [RI 97-15a]). Most of the pluton is trachytoidal, quartz-free syenite and subequigranular quartz syenite, with a core of altered, equigranular quartz syenite, granite, and pegmatite.
Bedrock in the Elephant Gulch area is Lower Cretaceous graywacke, sandstone, conglomerate, and shale. The bedded rocks locally are hornfelsed, with development of unoriented crystals or rosettes of muscovite and biotite. The area is cut by west-northwest-trending, high-angle faults.A sample (96KC080) of dark gray, matrix-supported conglomerate, sandstone, and quartzite from the west side of upper Elephant Gulch contained 134 parts per million (ppm) antimony and 260 ppm zinc (Liss and others, 1998). There is no record of exploration or mining at this site.
|Geologic map unit||(-150.039770548575, 65.251977677259)|
|Workings or exploration||A sample (96KC080) of dark gray, matrix-supported conglomerate, sandstone, and quartzite from the west side of upper Elephant Gulch contained 134 parts per million (ppm) antimony and 260 ppm zinc (Liss and others, 1998). There is no record of exploration or mining at this site.|
|Indication of production||None|
Chapman, R.M., Yeend, W.E., Brosge, W.P., and Reiser, H.N., 1982, Reconnaissance geologic map of the Tanana quadrangle: U.S. Geological Survey Open-File Report 82-734, 20 p., scale 1:250,000.
Liss, S.A., Reifenstuhl, R.R., Clautice, K.H., Bundtzen, T.K., Newberry, R.J., Dover, J.H., and Blodgett, R.B., 1998, Rock geochemistry from the Manley mining district (Tanana A-1 and A-2 quadrangles with some samples from adjacent quadrangles): Alaska Division of Geological & Geophysical Surveys Public Data File 98-39, 41 p., 1 DVD.
McCoy, Dan, Newberry, R.J., Layer, Paul, DiMarchi, J.J., Bakke, Arne, Masterman, J.S., and Minehane, D.L., 1997, Plutonic-related gold deposits of interior Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 191-241.
Reifenstuhl, R.R., Dover, J.H., Pinney, D.S., Newberry, R.J., Clautice, K.H., Liss, S.A., Blodgett, R.B., Bundtzen, T.K., and Weber, F.R., 1997, Geologic map of the Tanana B-1 Quadrangle, central Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 97-15A, 17 p., 1 sheet, scale 1:63,360.
|Reporters||D.J. Szumigala (ADGGS)|
|Last report date||5/20/2004|