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Unnamed Occurrence (ARDF - ID055; head of Caribou Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: This occurrence is on a small but prominent knob, hill 877, on an unnamed fork of Caribou Creek. The occurrences is at an elevation of about 700 feet, about 0.5 mile west to west-southwest of the center of section 8, T. 28 N., R. 46 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of altered, iron-oxide-stained hornfels near a biotite-bearing, fine grained intrusion. The intrusion has been radiometrically dated as 70.2 Ma (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The mineralized body is of uncertain size and orientation. One grab sample of mineralization rock contained 2,000 parts per billion (ppb) silver, 850 parts per million (ppm) arsenic, 200 ppm copper, 52 ppm bismuth, 30 ppm tin, and 50 ppb gold (McGimsey and others, 1988).
Workings: The area was sampled by the Alaska Division of Geological and Geophysical Surveys and U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Age: Undated; the nearby intrusion is 70.2 Ma (Miller and Bundtzen, 1994).
Alteration: Iron oxide staining.

Commodities (Major) - Ag, Bi, Sn; (Minor) - As, Au, Cu
Development Status: None
Deposit Model: Sn-polymetallic deposit or Polymetallic vein (Cox and Singer, 1986; model 20b o

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1 entry listed.

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References

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.

Mineral and/or Locality  
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