Unnamed (southeast of summit of Granite Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities As; Bi; Zn
Other commodities Fe; Hg; Sb
Ore minerals hematite; limonite

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale B-2
Latitude 62.31123
Longitude -156.70347
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the southeast slope of Granite Mountain at an elevation of about 1,600 feet. It is about 0.9 mile south-southeast of peak 2923, the top of Granite Mountain, and about 0.2 mile south of the center of section 28, T. 26 N., R. 40 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence consists of a hematite-bearing, breccia zone of unknown size and orientation in shale and sandstone of the Upper Cretaceous Kuskokwim Group. It is about a mile southeast of the edge of the Granite Mountain pluton (Miller and Bundtzen, 1994; Bundtzen and Miller, 1997, and Bundtzen, Miller, and Gray, 2004). A grab sample of mineralization contained 450 parts per million (ppm) zinc, more than 10 ppm mercury, 400 ppm arsenic, 7.0 ppm bismuth, 22 ppm antimony, and 15.00 percent iron (McGimsey and others, 1988).
Geologic map unit (-156.70584841223, 62.310564003679)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Unknown; the nearby Granite Mountain pluton has a 40K/40Ar age of 62.6 Ma Bundtzen and Miller, 1997).
Alteration of deposit Hematite.

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in 1986 (McGimsey and others, 1988).
Indication of production None

References