Brown Bear

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Pb; Zn
Ore minerals arsenopyrite; chalcopyrite; galena; gold; pyrite; pyrrhotite; sphalerite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-7
Latitude 60.3408
Longitude -149.3409
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located near the head of Kenai Lake on the east side of the Seward Highway about 150 feet above the lake. It is in the NE1/4 section 19, T. 3 N., R. 1 E., of the Seward Meridian. This is location 78 of Cobb and Tysdal (1980) and location S-220 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The host rock of the Brown Bear prospect is slate and sandstone of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). The host rock strikes N12E and dips 45E. The prospect consists of a 1.5- to 5-inch-wide quartz-calcite vein that parallels the host rock strike and can be traced along the surface for 250 feet (Hoekzema and Sherman, 1983). Metallic minerals include arsenopyrite, chalcopyrite, galena, pyrrhotite, pyrite, and sphalerite; gold is also present (Cobb and Tysdal, 1980). Martin and others (1915) reported a short adit at the prospect but gave no details. No assay results are reported in the literature.
Geologic map unit (-149.343048781259, 60.340237773543)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration Workings on the prospect consist of (Martin and others, 1915). Martin and others (1915) reported that several feet of adit driven in 1912 at the prospect but gave no further details. There are no assay results reported in the literature.
Indication of production None

References

MRDS Number A010368

References

Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 3/9/2001