Argllite, quartzite and siltstone of the Pennsylvanian (and possibly Permian) Mount Roberts Formation host a narrow quartz vein, up to 0.4 metres thick, which contains pyrite and pyrrhotite. The vein is vertically dipping and strikes 072 degrees. A zone of crushed country rock occurs on the footwall side of vein. The vein is crosscut by a quartz diorite dyke striking across the vein at right angles. Gold and silver values are generally low but selected samples grade as high as 30 grams per tonne gold and 144 grams per tonne silver (Bulletin 1, page 123). One sample taken across 0.46 metres assayed 4.46 grams per tonne gold and 106.29 grams per tonne silver (Bulletin 1, page 123). Some underground development has occurred.