Unnamed (western Russian Mountains)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Sn
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale RM
Quadrangle map, 1:63,360-scale C-1
Latitude 61.67
Longitude -159.093
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is in the Russian Mountains on the east side of the cirque valley at the head of Cobalt Creek. The map site is at an elevation of about 1,950 feet, in the northwest corner of sec. 9, T. 18 N., R. 54 W., of the Seward Meridian. This is sample locality 9 of Bundtzen and Laird (1991).

Geologic setting

Geologic description

A gossan-rich, sheeted quartz vein in hornfels has been explored by a now-caved adit at this location. Euhedral quartz crystals are well-developed in the vein. A sample contained 250 ppb gold, 250 ppm arsenic, and 62 ppm tin (Bundtzen and Laird, 1991). The prospect is within about 300 feet of the southern contact of the Russian Mountains intrusive complex.
Geologic map unit (-159.095367554091, 61.6692857345056)
Mineral deposit model Polymetallic veins? (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c?
Age of mineralization Late Cretaceous or Tertiary. Veins postdate hornfels developed around the intrusive complex of the Russian Mountains. Quartz monzonite from this complex has yielded a K/Ar age of 70.3 +/- 2.1 Ma (Bundtzen and Laird, 1991).
Alteration of deposit Quartz veining.

Production and reserves

Workings or exploration A now-caved adit explored this prospect.
Indication of production None