U.S. Silica Holdings, Inc. Announces 2012 Second Quarter Conference Call

U.S. Silica Holdings, Inc. (NYSE: SLCA) will host a conference call on Tuesday, July 31, 2012, to discuss its second quarter 2012 financial results. The company will issue a press release regarding the results prior to the conference call, which will be posted on its website at www.ussilica.com. The call will begin at 10:00 A.M. Eastern Time. Call access information is below.

Conference Call Access:

Live webcast on the Investor Relations page of www.ussilica.com

Within the U.S. at 877.705.6003

Outside the U.S. at 201.493.6725.

Replay Access:

Investor Relations page of www.ussilica.com

Within the U.S. at 877.870.5176 (access code: 397401)

Outside the U.S. at 858.384.5517

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. 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 200 products to customers across these end markets. U.S. Silica Holdings, Inc. is headquartered in Frederick, Maryland.

For more information, contact Anita Willis-Boyland at Willis-Boyland@USSilica.com or 301.682.0676.

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