|Quadrangle map, 1:250,000-scale||ID|
|Quadrangle map, 1:63,360-scale||C-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is 0.2 mile southeast of hill 1,850 on a north-facing knob in the headwaters of Caribou Creek. The occurrence at an elevation of about 1,600 feet in the SW1/4 SW1/4 section 18, T. 28 N., R. 46 W., of the Seward Meridian. The location is accurate.|
Geologic descriptionThis occurrence is a zone of extensive tourmaline-calcite-chlorite alteration in intermediate dikes that intrude shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The occurrence is of uncertain size and orientation. Grab samples contain up to 200 parts per million (ppm) tin, 500 ppm zinc, 500 ppm antimony, 480 ppm arsenic, 200 ppm lead, 46 ppm bismuth, and 1,000 parts per billion (ppb) silver (McGimsey and others, 1988).
|Geologic map unit||(-157.863308135968, 62.5090271768207)|
|Mineral deposit model||Sn-polymetallic deposit or Polymetallic vein (Cox and Singer, 1986; model 20b or 22c).|
|Mineral deposit model number||20b or 22c|
|Age of mineralization||Unknown; the dikes that intrude the Upper Cretaceous Kuskokwim Group in the area are undated.|
|Alteration of deposit||Development of tourmaline-chlorite-calcite greisen.|
|Workings or exploration||The occurrence was sampled by the U.S. Geological Survey 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||5/19/2003|