Russian Bear

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite
Gangue minerals garnet

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale A-2
Latitude 55.22261
Longitude -132.58512
Nearby scientific data Find additional scientific data near this location
Location and accuracy The location of the Russian Bear provided by Wright and Wright (1908) is unclear. They say that it is at an elevation of 100 feet about a mile northeast of the Gould Group (CR156). Their location of the Gould Group seems fairly unambiguous, but for the Russian Bear to be at an elevation of 100 feet, i.e. just above the shoreline, it would have to be west of the Gould Group. Neither location for the Russian Bear is consistent with the geology described below. For this record, the Russian Bear prospect is somewhat arbitrarily plotted about a half-mile northeast of the Gould Group at an elevation of about 1,000 feet, near the center of section 3, T. 77 S., R. 85 E. In support of this location, Herreid and others (1978) map skarn along a contact at this site and show unidentified workings nearby. Probably the best that can be said with certainty is that the Russian Bear prospect is near the head of Copper Harbor.

Geologic setting

Geologic description

As described by Wright and Wright (1908), the Russian Bear claim is a contact-metamorphic copper deposit near a granitic batholith. The claim has been explored by trenches and open cuts. The deposit undoubtedly is similar to other contact-metamorphic copper deposits in the vicinity (for example, CR152 and 156). As mapped by Herreid and others (1978), the deposit is near the contact between Cretaceous granodiorite and albite-epidote hornfels; garnetiferous skarn is locally developed near the contact, where there are workings at several locations.
Geologic map unit (-132.586780278081, 55.2222572938989)
Mineral deposit model Copper skarn (Cox and Singer, 1986; model 18b).
Mineral deposit model number 18b
Age of mineralization Probably Cretaceous.
Alteration of deposit Garnet-bearing skarn developed near contact of Cretaceous granodiorite.

Production and reserves

Workings or exploration Apparently only trenches and open cuts prior to WW I.
Indication of production None

Additional comments

The Russian Bear prospect is on land that has been conveyed to the Sealaska Corporation, who hold the surface and subsurface rights, or the land is under application for transfer to them.

References