Katz Prospect, Innoko District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: The Katz (or Kaatz) deposit is a stibnite-quartz-gold vein 4 to 12 inches thick along the footwall of a granite porphyry dike that contains disseminated stibnite and arsenopyrite. The vein strikes N30E and dips 75SE; it is subparallel to the dike. According to Mertie and Harrington (1924), the vein and the associated dike can be traced for about a mile. The Katz lode occurs directly over the projection of the Ganes-Yankee fault and dike swarm (Bundtzen and Laird, 1982; Bundtzen and Miller, 1997). According to Miller, Bundtzen and Gray (2004), grab samples contain up to 1,100 parts per billion (ppb) gold, 2,000 ppb silver, and 35.00 percent antimony. The Katz deposit is similar to the Independence Mine (ID031) and the Goss Gulch deposit (ID039) which also occur along Ganes-Yankee fault and dike swarm (Bundtzen and Miller, 1997).
Workings: The Katz prospect was explored by old trenches and an adit, now caved, probably before 1920.
Age: Undated; probably Late Cretaceous, based on nearby dated intrusions along the Ganes-Yankee Creek fault (Bundtzen and Miller, 1997).
Alteration: Dike is carbonatized and sericitized.
Commodities (Major) - Au, Sb; (Minor) - Ag, As
Development Status: Undetermined.
Deposit Model: Gold-antimony deposit (Berger, 1993) or simple antimony vein (Cox and Singer,
3 entries listed. 3 valid minerals.
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Berger, V.I., 1993, Descriptive and grade and tonnage model for gold-antimony deposits: U.S. Geological Survey Open-File Report 93-194, 24 p. Bundtzen, T.K., and Laird, G.M., 1982, Geologic map of the Iditarod D-2 and eastern D-3 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 72, 1 sheet, scale 1:63,360. 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. Cobb, E.H., 1972, Metallic mineral resources map of the Iditarod quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-363, 1 sheet, scale 1:250,000. Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction material) in the Iditarod and Ophir quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-576, 101 p. 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. Mertie, J.B., Jr., and Harrington, G.L., 1924, The Ruby-Kuskokwim Region, Alaska: U.S. Geological Survey Bulletin 754, 129 p. 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.