|Quadrangle map, 1:250,000-scale||ID|
|Quadrangle map, 1:63,360-scale||D-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on a northeast-trending ridge east of Spaulding Creek, at an elevation of 550 meters. It is in the NE1/4 SE1/4, section 20, T. 33 N., R. 38 W., of the Seward Meridian. The location is accurate (T.K. Bundtzen, unpub. field data, 1979).|
Geologic descriptionThis occurrence is in a N60E-trending, mafic to intermediate dike or sill about 30 feet thick. The dike or sill intrudes the shale and sandstone of the Upper Cretaceous, Kuskokwim Group. The dike has been extensively altered to silica-carbonate rock in breccia zones up to 10 feet wide at the contacts of the dike and the sedimentary rocks. Shear zones in adjacent sandstone are pyritized (Bundtzen and Laird, 1982; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). A grab sample of mineralized dike contained 0.16 ounce of silver per ton, 1,000 parts per million chromium, and 150 parts per billion gold (Bundtzen and Laird, 1982; Miller, Bundtzen, and Gray, 2005). A highly brecciated felsic dike thought to be an extension of the breccia unit at the Katz prospect (ID028) is exposed about 65 feet west of this occurrence.
|Geologic map unit||(-156.515385241554, 62.9338565077743)|
|Mineral deposit model||Polymetallic vein (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|Age of mineralization||Undated; probably Late Cretaceous based on nearby dated intrusions along Ganes-Yankee Creek fault (Bundtzen and Miller, 1997).|
|Alteration of deposit||Extensive silica-carbonate alteration of a intermediate to mafic dike; sericitic alteration in felsic dike.|
|Workings or exploration||Three prospect pits about 50 feet apart expose the altered dike.|
|Indication of production||None|
Bundtzen, T.K., and Laird, G.M., 1982, Geologic map of the Iditarod D-2 and eastern D-3 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 72, 1 sheet, scale 1:63,360.
Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
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||5/13/2003|