|Quadrangle map, 1:250,000-scale||ID|
|Quadrangle map, 1:63,360-scale||B-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is exposed on a small bluff on the north side of Bonanza Creek, about 2.0 miles northeast of the mouth of First Chance Creek. It is about 0.3 mil west-southwest of the center of section 9, T. 26 N., R. 46 W., of the Seward Meridian. The location is accurate.|
Geologic descriptionThis prospect is a stibnite-quartz vein up to 3 feet thick near a granite porphyry dike or sill that is similar to the sill at the occurrences about a half mile to the northeast (ID124) (Bundtzen and others, 1992; Miller, Bundtzen, and Gray, 2005). The rocks in the area are shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994). The orientation of the vein is uncertain. Masses of stibnite up to 1 inch thick were noted in the quartz gangue of the vein but no other sulfides were identified. Grab samples contained more than 1.00 percent antimony, 1.0 part per million (ppm) silver, 300 ppm lead, 120 ppm arsenic, and a trace of gold (McGimsey and others, 1988).
|Geologic map unit||(-157.82959276574, 62.3557229915827)|
|Mineral deposit model||Simple Sb vein (Cox and Singer, 1986; model 27d).|
|Mineral deposit model number||27d|
|Alteration of deposit||Silicification.|
|Workings or exploration||Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).|
|Indication of production||None|
Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
Bundtzen, T.K., Miller, M.L., Laird, G.M., and Bull, K.F., 1992, Geology and mineral resources of Iditarod mining district, Iditarod B-4 and eastern B-5 quadrangles, southwestern Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 97, 46 p., 2 sheets, scale 1:63,360.
McGimsey, R.G., Miller, M.L., and Arbogast, B.F., 1988, Paper version of analytical results, and sample locality map for rock samples from the Iditarod quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-421-A, 110 p., 1 sheet, scale 1:250,000.
Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major oxide, trace element, fossil, paleocurrent, and archeological sample localities: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-A, 48 pages; 1 sheet, scale 1:250,000.
|Reporters||T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)|
|Last report date||5/24/2003|