Vein-type barite occurrences on the Barmac property are hosted by shale and dolomite of the Lower to (?)Middle Cambrian Eager Formation. The barite is white to cream coloured and contains minor amounts of tetrahedrite, malachite and azurite. These barite veins vary from 0.1 to 3.1 metres wide. Some quartz is also associated with the barite.