The Springhouse hydromagnesite showing, unlike most of the occurrences of the Chilcotin Plateau where hydromagnesite is being formed in modern lakes, is an older occurrence, having been buried during later soil development.

White, clay like material is reported to underlie 10 to 30 centimetres of soil in scattered locations. One occurrence close to the Williams Lake-Springhouse Road, near Boitano Lake was sampled and indicated 33.1 per cent MgO, 4.9 per cent CaO, 42 per cent CO2 and H2O, 4.3 per cent iron and alumina and 14.8 per cent insoluble (Bulletin 4).