An investigation was conducted by the federal Bureau of Mines to determine the feasibility of using domestic chromite as a molding material for ferrous castings. A submetallurgical-grade chromite was obtained from a stockpile near Nye, Montana, and characterized with respect to grain size and chemical and mineralogical composition. Tests indicated that the cr2o3 content of the material could be increased from 42 to 44 pct by high-tension electrostatic separation. This upgraded material approached the Steel Founders' Society of America (SFSA) molding material specifications with respect to chemical composition, ph, acid demand and loss on ignition. Comparisons of the thermal expansion and fusion points of the upgraded material with a commercial sample were found to be essentially identical.