The northwest part of Huxley Island is underlain by massive grey limestone and thin bedded black limestone of the Late Triassic Sadler and Peril Formations (Kunga Group), which are cut by andesitic dikes of the Eocene-Oligocene Kano Plutonic Complex (Burnaby Island Dike Swarm). The rocks are also cut by north-northwest trending faults related to the Louscoone Inlet-Rennell Sound fault zone.

Pods of massive pyrite, chalcopyrite and sphalerite occur in silicified grey limestone adjacent to andesite dikes. A sample taken about 500 metres northeast of these showings assayed 0.8 gram per tonne of gold (Assessment Report 8251). In 1979, a 2.0-metre chip sample taken from silicified limestone assayed 0.14 gram per tonne gold, 450.0 grams per tonne silver and traces of antimony (Assessment Report 8094).