Unnamed Occurrence (ARDF - ID124; north bank of Bonanza Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This 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).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Commodities (Major) - Sb; (Minor) - Ag, As, Au, Pb
Development Status: None
Deposit Model: Simple Sb vein (Cox and Singer, 1986; model 27d).
2 entries listed. 2 valid minerals.
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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. Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet.