The area of the Randeb 2 showing is underlain by mainly quartz-sericite-biotite gneiss and associated lenses of metavolcanic and ultramafic rocks. These rocks are part of the Custer Gneiss, a metamorphic package probably derived from lower Mesozoic and possibly Paleozoic and Precambrian rocks and metamorphosed in the Late Cretaceous and early Tertiary.

A selected sample of "mineralized and serpentinized peridotite- gabbro" rock from the bottom of a trench yielded 1.5 grams per tonne gold, 2.6 grams per tonne silver and greater than 0.05 per cent nickel (Assessment Report 10997). The character of the mineralization was not indicated.