The Irish occurrence area is underlain by limestone of the Upper Triassic Quatsino Formation (Vancouver Group) intruded by a small fine-grained diorite stock. Mafic diorite dykes up to 3.6 metres wide are found throughout the property and most are mineralized with pyrite, pyrrhotite and minor magnetite.

The Irish showing comprises galena and chalcopyrite sparsely disseminated in limestone with galena veins feathering out at 350 degrees. Nearby, blebs of chalcopyrite occur in a mafic dyke. Further east, limestone is bleached for 30 centimetres across an open fracture striking 005 degrees and dipping 80 degrees east and contains veinlets and pockets of sphalerite and minor pyrite.

A core sample of dyke material from a shallow diamond-drill hole assayed 1.30 grams per tonne gold and 4.79 grams per tonne silver (Assessment Report 9417).