US Silica Holdings, Inc., is a domestic producer of commercial silica, a specialized mineral. The Company operates in two segments: Oil & Gas Proppants and Industrial & Specialty Products. It includes oil and gas, glass, chemicals, foundry, building products, fillers and extenders, recreation, industrial filtration and treatment, and testing and analysis. The Company�s products include proppants, whole grain silica, ground silica, fine ground silica, testing silica, recreational silica, aplite, kaolin, hydrous kaolin and FLORISIL. It also operates as a research and development specialist for customized products and solutions. The Company serves a range of industries and applications, which includes oil and gas, glass, chemicals, foundry, building products, fillers and extenders, recreation, industrial filtration and treatment, and testing and analysis. In August 2014, U.S. Silica Holdings Inc acquired Cadre Services Inc., a regional sand mining company based in Voca, Texas.