Prospect, Probably inactive

Commodities and mineralogy

Main commodities Au
Other commodities Sb; Sn
Ore minerals arsenopyrite; chalcopyrite
Gangue minerals quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale RM
Quadrangle map, 1:63,360-scale C-1
Latitude 61.666
Longitude -159.118
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the west side of the cirque valley at the head of Cobalt Creek in the Russian Mountains. The map site is at an elevation of about 1,850 feet, about 0.25 mile west of a small cirque-basin lake, in the NW1/4 sec. 8, T. 18 N., R. 54 W., of the Seward Meridian. This is sample locality 12 of Bundtzen and Laird (1991).

Geologic setting

Geologic description

The Louise prospect is about 1,500 feet northwest of the Owhat prospect (RM016). According to Bundtzen and Laird (1991), it was first reported by Holzheimer (1926) as a 1,000-foot-long gold-arsenic deposit. Bundtzen and Laird (1991) described the deposit as an arsenopyrite, chalcopyrite, quartz, and black tourmaline vein that trends northwest for at least 245 feet along the contact between syenite and an altered andesite porphyry dike. The width of this poorly exposed vein could not be determined. A sample of the vein contained 4.1 ppm gold, 10 percent arsenic, 0.99 percent antimony, and 0.12 percent tin (Bundtzen and Laird, 1991). The host rocks are part of the Upper Cretaceous intrusive complex of the Russian Mountains.
Geologic map unit (-159.120365680418, 61.6652854110826)
Mineral deposit model Polymetallic veins? (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c?
Age of mineralization Late Cretaceous or Tertiary. Veins crosscut part of 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 and tourmaline veining.

Production and reserves

Workings or exploration Surface observation and sampling have been completed (Bundtzen and Laird, 1991).
Indication of production None