The Nunatak area is underlain by Lower Permian limestone of the Stikine Assemblage.

Garnet-pyroxene-epidote skarn, containing varying amounts of magnetite, pyrrhotite, pyrite and chalcopyrite, occurs as zones, up to five metres thick, along the contacts of monzonitic sills and limestone. Separate samples yielded values as high as 14.33 grams per tonne gold, 201.6 grams per tonne silver, 9.51 per cent copper and 1.44 per cent zinc. (Assessment Report 20791).

See the Scud River property (104G 141) for related work history and geological details. Consolidated Goldwest Resources traced float back to the Nunatak claim in the late 1980s, but the claim was not part of the Scud River property.