At the Outlier Ridge showing, steeply dipping quartz-calcite- barite veins cut strata of the Helikian Roosville Formation (Purcell Supergroup) consisting of siltstone, argillite, sandstone, quartzite and dolomite, in the southwestern part of the MacDonald Range. Three barite showings were discovered along the crestal region of the Wigwam anticline. The veins are fracture-fillings that vary in thickness from a few centimetres to over one metre.