PILLSBURY WINTHROP SHAW PITTMAN LLP

2300 N St. NW

Washington, DC 20037

June 19, 2013

By EDGAR

Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

 

Attention:		Myra Moosariparambil
		Craig Arakawa
		Tiffany Piland
		James Lopez
		John Reynolds

 

Re:		U.S. Silica Holdings, Inc.
		Form 10-K for the year ended December 31, 2012
		Filed February 26, 2013
		File No. 001-35416

Ladies and Gentlemen:

This letter is in reference to the comment letter received by our client, U.S. Silica Holdings, Inc. (the “Company”), dated June 10, 2013 regarding the above-captioned filing. The Company’s draft response is underway. In accordance with the terms of the comment letter, we hereby advise you within 10 business days of the date thereof that the Company’s full response will be submitted via EDGAR no later than July 3, 2013, and we respectfully request your assent to that timeframe.

If you would like to discuss this matter, please do not hesitate to contact me at 202-663-8364.

Thank you for your courtesy and cooperation.