The area is underlain mainly by Paleozoic-Mesozoic metavolcanics consisting of chlorite amphibole schist and narrow zones of meta- sediments comprised of limestone, quartzite and argillite. The crystalline limestone, up to 3 metres thick, trends northwest for about 1 kilometre and dips 45 degrees to 60 degrees east. Magnetite in quartzite and limestone represents the northwest extension of a 4 kilometre long magnetite zone (see Star 103J 031).