|Quadrangle map, 1:250,000-scale||RM|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is on the crest of a ridge north of Mount Hamilton and east of Ophir Creek, near a local summit with an elevation of 1,310 feet. The map site is at the northeast corner of sec. 14, T. 13 N., R. 59 W., of the Seward Meridian. This is locality 1 of Frost (1990). The location is probably accurate within one-quarter mile.|
Geologic descriptionFrost (1990) described gold- and pyrite-bearing quartz veins cutting sericitized andesite and volcaniclastic hornfels at this location. The veins are vuggy and contain euhedral quartz prisms extending into open spaces. Other gangue minerals in the iron oxide-stained veins are commonly calcite and chlorite. A quartz vein from this prospect contained 12 ppm gold and 10 ppm silver (Frost, 1990, sample locality 1). Bedrock in the area includes thermally metamorphosed Jurassic volcanic or volcaniclastic rocks (Box and others, 1993). The thermal metamorphism is caused by a large mid-Cretaceous granitic pluton exposed to the west of Ophir Creek.
|Geologic map unit||(-159.796318893179, 61.2212708412614)|
|Mineral deposit model||Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)|
|Mineral deposit model number||36a|
|Age of mineralization||Cretaceous or Tertiary. The gold-bearing quartz veins crosscut hornfels developed in country rocks around a mid-Cretaceous granitic pluton.|
|Alteration of deposit||Sericitization and silicification.|
|Workings or exploration||Prospecting pit(s) are present at this location.|
|Indication of production||None|
Box, S. E, Moll-Stalcup, E. J., Frost, T. P., and Murphy, J. M., 1993, Preliminary geologic map of the Bethel and southern Russian Mission quadrangles, southwestern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2226-A, 20 p., scale 1:250,000.
|Reporters||Travis L. Hudson and Madelyn A. Millholland|
|Last report date||6/10/2001|