U.S. Silica is one of the leading producers of industrial minerals in the United States. Based in Pacific, Mo., the firm offers a plethora of products, such as proppants, whole-grain sands, testing sands, recreation sands, filtration sands, ground silica, aplite and kaolin, to name a few. It also provides a range of low iron, silica sands for the glass industry as well as 50 grades of round and sub-angular foundry sands for molding and core making applications. . The company caters to oil/gas, foundry, geothermal, municipal industrial filtration, pool filtration, recreation and chemicals industries.