A north trending fault along Lute Creek separates metavolcanics consisting of chlorite-sericite schist derived from porphyritic flows and tuffs, to the east and phyllite, overlain by feldspar porphyry and trachyte, to the west. The trachyte, which is unit EBFt of the Eagle Bay Assemblage (Schiarizza and Preto, 1987), contains a radio- active zone with uranium-thorium minerals, pyrite and minor galena and chalcopyrite.

About 800 metres to the west, a drill hole intersected 10 metres of trachyte with low to medium radioactivity. A 1.5 metre sample assayed 0.027 per cent uranium and 0.09 per cent ThO2 (Property File, Report and Map by P. Pisani, 1970).