U.S. Silica Holdings, Inc. Announces Filing of Annual Report on Form 10-K

Press Release

FREDERICK, MD (March 21, 2012) – U.S. Silica Holdings, Inc. (NYSE: SLCA) (the “Company”) announced today that it has filed its Annual Report on Form 10-K, containing audited consolidated financial statements for the year ended December 31, 2011, with the Securities and Exchange Commission (“SEC”).  The report can be viewed on the SEC’s website, http://www.sec.gov, and on the Company’s website, http://www.ussilica.com/investors/secfilings.

Stockholders of the Company may obtain a hard copy of the Company’s audited consolidated financial statements included in the report free of charge upon request, which can be submitted from the Company’s website or in writing to Investor Relations, U.S. Silica Holdings, Inc., 8490 Progress Drive, Suite 300, Frederick, Maryland 21701.

About the Company

U.S. Silica Holdings, Inc., a Delaware corporation, is the second largest domestic producer of commercial silica, a specialized mineral that is a critical input into the oil and gas proppants end market and a variety of attractive industrial and specialty products end markets. During its 111-year history, U.S. Silica Holdings, Inc. has developed core competencies in mining, processing, logistics and materials science that enable it to produce and cost-effectively deliver over 200 products to customers across these end markets. U.S. Silica Holdings, Inc. is headquartered in Frederick, Maryland.

CONTACT: U.S. Silica Holdings, Inc., Telephone: 855-SILICA-7 (855-745-4227), Email: IR@ussilica.com

About U.S. Silica

U.S. Silica Holdings, Inc. is a performance materials company and is a member of the Russell 2000 Index. The Company is a leading producer of commercial silica used in a wide range of industrial applications and in the oil and gas industry. Over its 119-year history, U.S. Silica has developed core competencies in mining, processing, logistics and materials science that enable it to produce and cost-effectively deliver over 1,500 diversified products to customers across our end markets. U.S. Silica's wholly-owned subsidiaries include EP Minerals and SandBox Logistics™. EP Minerals is an industry leader in the production of products derived from diatomaceous earth, perlite, engineered clays, and non-activated clays. SandBox Logistics™ is a state-of-the-art leader in proppant storage, handling and well-site delivery, dedicated to making proppant logistics cleaner, safer and more efficient. The Company currently operates 27 mines and production facilities. The Company is headquartered in Katy, Texas and has offices in Frederick, Maryland, Reno, Nevada and Chicago, Illinois.

Questions? Get in touch: 281-394-9584

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