Exhibit 21.1 ------------ Subsidiaries of the Registrant - ------------------------------------------------------------ Names of the Subsidiaries of the State of Registrant Formation - ------------------------------------------------------------ U.S. Silica Company Delaware Better Materials Corporation Pennsylvania BMC Trucking, Inc. Delaware Bucks County Crushed Stone Company Pennsylvania Chippewa Farms Corporation Pennsylvania Shore Stone Company, Inc. New Jersey Pennsylvania Glass Sand Corporation Delaware George F. Pettinos, Inc. Delaware Ottawa Silica Company Delaware The Fulton Land and Timber Company Pennsylvania Ellen Jay, Inc. New Jersey Stone Materials Company, LLC Delaware Commercial Stone Co., Inc. Pennsylvania Commercial Aggregates Transportation and Delaware Sales, LLC - ------------------------------------------------------------