Bears Nest

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale B-2
Latitude 58.2716
Longitude -134.3839
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Bears Nest prospect is on the southwest shore of Gastineau Channel, on Douglas Island immediately south of the Douglas boat harbor. It is just east of the center of section 36, T. 41 S., R. 67 E. of the Copper River Meridian. The location is accurate.

Geologic setting

Geologic description

The deposit at the Bears Nest prospect was discovered in 1881 and has a 1,500-foot adit. An 80-stamp mill had been installed and the adit had already been driven when Alaska Gold Company determined that the prospect was worthless; it had been salted in 1888 before they bought it for an unprecedented $2.5 million (Stone and Stone, 1980). The prospect is in black phyllite, massive metagabbro, chloritic phyllite and a hornblende-diorite sill, locally called the Bears Nest sill. The Bears Nest sill contains disseminated pyrite and pyrite-bearing quartz stringers. U.S. Bureau of Mines samples contained no significant gold values (Redman and others, 1989).
The rocks in the general area are Upper Jurassic or Cretaceous marine argillite and graywacke, interbedded with andesite or basalt (Brew and Ford, 1985). The bedded rocks are regionally metamorphosed to prehnite-pumpellyite or greenschist grade, and cut by diorite or gabbro dikes and sills.
Geologic map unit (-134.385668271231, 58.2712715091074)

Production and reserves

Workings or exploration The deposit at the Bears Nest prospect was discovered in 1881 and has a 1,500-foot adit. An 80-stamp mill had been installed and the adit had already been driven when Alaska Gold Company determined that it was worthless; the prospect had been salted in 1888 before it was sold to them for an unprecedented $2.5 million (Stone and Stone, 1980).
Indication of production None

References