Red Mountain

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; As
Other commodities As; Au; Bi; Cd; Cu; Hg; Mo; Pb; Sb; Sn; Zn
Ore minerals arsenopyrite; goethite (after sulfides)
Gangue minerals axinite; quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale SM
Quadrangle map, 1:63,360-scale C-4
Latitude 61.57835
Longitude -157.28121
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Red Mountain prospect is along the southwest flank of Red Mountain, an isolated summit on the eastern edge of the Kuskokwim Mountains. The prospect is just southwest of VABM 1461 which is about 0.5 mile east of the center of section 8, T. 18 N., R. 44 W., of the Seward Meridian.

Geologic setting

Geologic description

The Red Mountain prospect consists of quartz-tourmaline veins, axinite-tourmaline breccias, and oxidized shear zones, associated with a hypabyssal, porphyritic to aphanitic pluton that intrudes shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; M.L. Miller, J.Y. Foley, and T.K. Bundtzen, unpublished field data, 1997). The mineralization covers about half of a square mile. Goethite dominates in the veins and breccias but relict arsenopyrite grains are locally preserved. Rubble-crop indicates that the veins and vein-breccias strike northeast.
In 1975, Resource Associates of Alaska, Inc. collected surface samples and reported up to 3,500 parts per billion (ppb) ppb gold and 24 parts per million (ppm) silver from samples collected on Red Mountain (Jennings, 1975). Twenty seven grab and chip samples collected in 1997 by the U.S. Geological Survey and Calista Corporation contained up to 1,140 ppb gold (3 samples contained more than 1,000 ppb gold), 18.0 ppm silver, 5,330 ppm arsenic, 134 ppm antimony, 10.8 ppm mercury, 450 ppm lead, 53 ppm tungsten, 645 ppm zinc, 167.0 ppm bismuth, 14.0 ppm cadmium, 116 ppm tin, 396 ppm copper, and 8.4 ppm molybdenum (M.L. Miller, J.Y. Foley, and T.K. Bundtzen, unpublished analytical data, 1997).
Geologic map unit (-157.283570168285, 61.5776552177923)
Mineral deposit model Silver-polymetallic veins (Cox and Singer, 1986; model 20b).
Mineral deposit model number 20b
Alteration of deposit Axinite-tourmaline-quartz greisen.

Production and reserves

Workings or exploration In 1975, Resource Associates of Alaska, Inc. (RAA) sampled the Red Mountain prospect on behalf of Calista Corporation. The prospect was examined by the U.S. Geological Survey, the Alaska Division of Geological Survey, and Calista Corporation in 1997.
Indication of production None



Jennings, D., 1975, Mineral resource evaluation for Calista Corporation-final report of exploration activities during 1975: Fairbanks, Alaska, Resource Associates of Alaska, Inc. unpublished report, 14 p.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.) and M.L. Miller (U.S. Geological Survey)
Last report date 5/9/2003