Unnamed Occurrence (ARDF - ID053; west of upper Moose Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Location: This occurrence is on a northeast-trending knob overlooking Moose Creek, about 500 feet southwest of hill 1115. It is at an elevation of about 1,000 feet, near the northwest corner of section 14, T. 29 N., R. 46 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of a zone of sericitized, iron-oxide-stained porphyritic dike rock that cuts a sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The dike is probably related to the Late Cretaceous or early Tertiary intrusions of the Kuskokwim mineral belt (Bundtzen and Miller, 1997). One sample collected in the altered zone contained 740 parts per million (ppm) antimony, 80 ppm arsenic, 680 parts per billion mercury, and a trace of gold (McGimsey and others, 1988).
Workings: The occurrence was sampled by the U.S. Geological Survey in 1985 (McGimsey and others, 1988).
Age: Undated; the dike is probably part of the Upper Cretaceous or early Tertiary intrusions of the Kuskokwim mineral belt (Bundtzen and Miller, 1997).
Alteration: Sericite alteration in granite-porphyry dike.
Commodities (Major) - Sb; (Minor) - As, Hg
Development Status: None
Deposit Model: Possibly a silica-carbonate mercury deposit or a simple antimony deposit (Cox a
2 entries listed. 2 valid minerals.
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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.