|Quadrangle map, 1:250,000-scale||ID|
|Quadrangle map, 1:63,360-scale||A-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is about 0.3 mile southeast of the summit of Mosquito Mountain at an elevation of about 2,100 feet. It is at about the center of the east boundary of section 13, T. 23 N., R. 53 W., of the Seward Meridian. The location is accurate.|
Geologic descriptionThis occurrence is a zone of heavily iron-oxide-stained altered hornfels derived from the Upper Cretaceous Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The rocks on Mosquito Mountain are a tuff-rich, clastic unit altered to hornfels that is cut by numerous intermediate sills; this suggests the presence of a nearby or buried intrusion (Miller and Bundtzen, 1994). The altered zone is of uncertain size and orientation. Grab samples of altered gossan contained up to 700 parts per billion (ppb) silver, 50 parts per million (ppm) arsenic, 38 ppm antimony, and 1,400 ppb mercury (McGimsey and others, 1988).
|Geologic map unit||(-158.899970963441, 62.0827054701593)|
|Alteration of deposit||Iron oxide gossan.|
|Workings or exploration||Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (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||5/25/2003|