Sample from the Highway Showing in the southwestern part of the Westwood ultramafic intrusion, with pegmatoidal texture and disseminated pyrrhotite and chalcopyrite. The course-grained, pyroxene-rich gabbroic rocks have a high magnesium, sanukitoid classification which is a common and important signature for many base metal - PGM mineral deposits in Archean rocks of the Superior Craton in the Canadian Shield in northern and western Ontario.