Unnamed (on hill 860 north of American Creek) (ARDF #ID154) As, Zn

Unnamed (on hill 860 north of American Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	As; Zn
Other commodities	Ag; Fe; Hg; Sb
Ore minerals	undetermined sulfides
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	ID
Quadrangle map, 1:63,360-scale	A-6
Latitude	62.03339
Longitude	-158.87614
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is about 300 feet south of hill 860 which is about 1.5 miles northwest of the mouth of American Creek on the Iditarod River. The occurrence is near the center of the S1/2 SE1/4 section 31, T. 23 N., R. 52 W., Seward Meridian. The location is approximate.

Geologic setting

Geologic description This occurrence is a zone of iron-oxide-rich sandstone in shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; Miller and Bundtzen, 1994). The mineralized zones contains thin quartz veinlets and trace amounts of undetermined sulfide minerals (Miller, Bundtzen, and Gray, 2005). One sample contained 200 parts per million (ppm) zinc, 400 ppm arsenic, 42 ppm antimony, 500 parts per billion (ppb) mercury, 50 ppb silver, and 20.00 percent iron (McGimsey and others, 1988).
Geologic map unit	(-158.878531220842, 62.0326850898419)
Mineral deposit model	Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number	22c
Alteration of deposit	Formation of iron oxides and silicification.

Production and reserves

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

References

References Cady, W.M., Wallace, R.E., Hoare, J.M., and Webber, E.J., 1955, The central Kuskokwim region, Alaska: U.S. Geological Survey Professional Paper 268, 132 p. 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. Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet.
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