October 4, 2019 Bryan A. Shinn President and Chief Executive Officer U.S. Silica Holdings, Inc. 24275 Katy Freeway, Suite 600 Katy, Texas 77494 Re: U.S. Silica Holdings, Inc. Form 10-K for the Year Ended December 31, 2018 Filed February 20, 2019 File No. 1-35416 Dear Mr. Shinn: We have completed our review of your filing. We remind you that the company and its management are responsible for the accuracy and adequacy of their disclosures, notwithstanding any review, comments, action or absence of action by the staff. Sincerely, Division of Corporation Finance Office of Energy & Transportation