The exact location of the Southern Cross showing is not known. The Southern Cross claims are reported to lie on the east side of the Bear River Glacier. The former position of the glacier in the Bear River valley is now occupied by Strohn Lake.

The area is underlain by Lower Jurassic andesitic volcanics of the Unuk River Formation (Hazelton Group). These rocks strike east-southeast and dip north (Bulletin 63).

Several showings have been reported on the claims. One of the showings comprises quartz veinlets carrying chalcopyrite, tetrahedrite and minor sphalerite and native silver(?). These occur across a width of 6 metres in tuffs, breccias and argillites. Elsewhere on the claims, four parallel veins contain hematite, magnetite, pyrite and some galena along small fractures (Minister of Mines Annual Report 1930).

A rock sample collected just east of the Bear River Pass, about 30 metres from the highway, may have been from the Southern Cross showing. The sample assayed 0.62 per cent copper and 1.1 grams per tonne gold (Assessment Report 6303).

During 1929-30, Morris and Lake carried out stripping and opencutting on the Southern Cross claims. In 1972, Keith Copper Mines Ltd. conducted a geophysical survey on the nearby Mina claims.