The Brown Bear showing is located just north of the Illiance River, about 3.5 kilometres east of Alice Arm. The area was investigated in 1916 and 1933 for base metals and uranium.

The region is underlain by an assemblage of volcanics and sediments comprising Upper Triassic Stuhini Group, Lower Jurassic Hazelton Group and Middle Jurassic to Upper Cretaceous Bowser Lake Group. This assemblage has been folded into a north-northwest trending anticline (Mount McGuire anticline) and regionally metamorphosed to greenschist facies.

The showing consists of a 1.2 metre wide quartz-barite vein exposed in a trench and a 6 metre long incline shaft at 152 metres elevation. The vein strikes 138 degrees and dips from 25 degrees northeast to 10 degrees southwest. It is hosted in Hazelton Group argillite and tuff on the western flank of the Mount McGuire anticline. Mineralization consists of galena, pyrite, arsenopyrite and minor sphalerite. A selected grab sample assayed trace gold and 21 grams per tonne silver (Minister of Mines Annual Report 1933, page 47).

About 150 metres to the east, at 166 metres elevation, a similar 1 metre wide vein is mineralized with pyrite, galena and sphalerite and is exposed in a trench and shallow shaft.