|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 at the base of a small bluff on the north side of Bonanza Creek, about 2.5 miles northeast of the mouth of First Chance Creek. The prospect is adjacent to Bonanza Creek. The prospect is near the center of section 9, T. 26 N., R. 46 W., of the Seward Meridian. The location is accurate.|
Geologic descriptionThis occurrence is a stockworks of quartz veinlets in a granite-porphyry sill that outcrops along the north bank of Bonanza Creek, 2.5 miles northeast of the mouth of First Chance creek. The zone of veinlets is 3-6 feet thick and and can only be seen in outcrops along the stream. Some silicification was noted in other areas of the outcrop (Bundtzen and others, 1992; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Grab samples contained up to 2,900 parts per billion (ppb) gold and 1,700 ppb mercury (McGimsey and others, 1988).
|Geologic map unit||(-157.816542362111, 62.3581429874051)|
|Mineral deposit model||Polymetallic vein (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|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|