U.S. Silica Promotes Mike Winkler to Vice President and Chief Operating Officer

Press Release

FREDERICK, Md.--(BUSINESS WIRE)--Dec. 18, 2013-- U.S. Silica Holdings, Inc. (NYSE: SLCA) today announced the promotion of Michael L. Winkler to vice president and chief operating officer.

In his new position, Mr. Winkler will continue his oversight of the Company’s mining and plant operations. He will also assume increased responsibilities, including leadership of the firm’s supply chain and logistics capabilities as well as its IT function.

“Mike’s outstanding results leading the operations team for the last two years and his commitment to safety, continuous improvement and productivity make him the ideal candidate for this role,” said Bryan Shinn, U.S. Silica president and chief executive officer. “As COO, Mike will provide leadership to ensure that internal cross-functional initiatives are flawlessly executed from mining through delivery and aligned with best-in-class customer service,” he added.

Mr. Winker has served as the Company’s vice president of operations since June, 2011. Prior to joining U.S. Silica, he held various positions within operations for the Campbell Soup Company and Mars, Inc. Mr. Winkler earned a B.S. degree in Industrial Engineering from the University of Wisconsin-Platteville and an MBA from the University of North Texas.

About U.S. Silica

U.S. Silica Holdings, Inc., a member of the Russell 2000, is one of the largest domestic producers of commercial silica, a specialized mineral that is a critical input into the oil and gas proppants end market. The company also processes ground and unground silica sand for a variety of industrial and specialty products end markets such as glass, fiberglass, foundry molds, municipal filtration and recreational uses. During its 100-plus 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 250 products to customers across these end markets. U.S. Silica Holdings, Inc. is headquartered in Frederick, Maryland.

Source: U.S. Silica Holdings, Inc.

U.S. Silica Holdings, Inc.
Michael Lawson
Director of Investor Relations and Corporate Communications
301-682-0304
lawsonm@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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