The Standard 4 claims are underlain by probable Lower Paleozoic metasedimentary and metavolcanic rocks. The dominant structure in the area is a north-south trending isoclinal anti- form, plunging gently (3 to 4 degrees) to the north.

Chalcopyrite, associated with pyrrhotite and carbonate banding, occurs in a talc-rich chlorite schist. This is part of a greenstone sequence comprising the east limb of the antiform.