|Quadrangle map, 1:250,000-scale||ID|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is near the head of Glacier Gulch and about 1.8 miles east-southeast of the mouth of Spaulding Creek. It is at an elevation of about 1,600 feet in the NE1/4 NE1/4, section 21, T. 33 N., R. 38 W., of the Seward Meridian. The location is accurate.|
Geologic descriptionThis occurrence consists of a 1.5-foot-thick, quartz-carbonate-sulfide vein in an altered feldspar-rich, dacite dike that intrudes shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Bundtzen and Laird, 1982; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Arsenopyrite and pyrite are disseminated near the edges of the vein. The dike is part of the intrusive suite associated with the Ganes-Yankee Creek fault (Bundtzen and Miller, 1997). One sample of sulfide-bearing quartz vein contained 1,110 parts per billion gold but no other elements in anomalous concentrations (Bundtzen and Laird, 1982).
|Geologic map unit||(-156.488954861075, 62.9402068608533)|
|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||The dike has undergone carbonatizationand, and the sulfides are weathered to iron oxides.|
|Workings or exploration||Several prospect pits, probably dug before World War II, explored the vein. Placer Dome Exploration explored the Ganes-Yankee Creek fault and dike swarm in this area in 1997; their data are not available.|
|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.
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||5/13/2003|