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