|Quadrangle map, 1:250,000-scale||ID|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is about 650 feet east of hill 2380 on a southern side of Granite Mountain. The occurrence is at an elevation of about 2,100 feet, about 0.4 mile west of the center of section 33, T. 26 N., R. 40 W., of the Seward Meridian. The location is accurate.|
Geologic descriptionThis occurrence is a irregular zone of tourmaline-rich quartz monzonite in the border phase of the 62.6 Ma, Granite Mountain pluton (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The size and orientation of the mineralized body is uncertain. One grab sample contained 1,500 parts per billion (ppb) silver, 200 parts per million (ppm) lead, 15 ppm tin, 12 ppm antimony, and more than 2,000 ppm boron McGimsey and others, 1988).
|Geologic map unit||(-156.716499026116, 62.3001732429936)|
|Mineral deposit model||Sn-polymetallic deposit (Cox and Singer, 1986; model 20b).|
|Mineral deposit model number||20b|
|Age of mineralization||Unknown; possibly related to the nearby Granite Mountain pluton that has a 40K/40Ar age of 62.6 Ma (Miller and Bundtzen, 1994).|
|Alteration of deposit||Tourmaline in quartz monzonite.|
|Workings or exploration||Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in 1984 (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|