|Quadrangle map, 1:250,000-scale||ID|
|Quadrangle map, 1:63,360-scale||C-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 1,600 feet about 1.0 mile north of hill 2170. It is about 0.3 mile northeast of the southwest corner of section 28, T. 31 N. R. 37 W., of the Seward Meridian. The location is accurate.|
Geologic descriptionThis occurrence is a pyrite-quartz-bearing shear zone about 65 feet thick that occurs at the contact of a small granite porphyry intrusion with biotite hornfels (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The rocks in the vicinity are mainly fine grained intrusive rocks and a large hornfels aureole; this suggests a large underlying intrusive body (Miller and Bundtzen, 1994). The mineralized shear zone can be traced for about a mile to the northeast. Grab samples collected along the zone contain 1,000 parts per million (ppm) mercury (D. Obolewicz, written communication, 1981). Other samples contain up to 500 parts ppm arsenic but no gold (McGimsey and others, 1988).
|Geologic map unit||(-156.236614996235, 62.7425419551258)|
|Mineral deposit model||Polymetallic vein? (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c?|
|Age of mineralization||Unknown; the nearby intrusion is undated (Miller and Bundtzen, 1994).|
|Alteration of deposit||Sericite.|
|Workings or exploration||The mineralized shear zone was sampled by Anaconda Minerals in 1981 (D. Obolewicz, written communication, 1981 and the U.S. Geological Survey in 1986 (McGimsey and others, 1988).|
|Indication of production||None|
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||5/18/2003|