U.S. SILICA HOLDINGS, INC. - FORM 10-K - EX-21.1 - LIST OF SUBSIDIARIES OF U.S. SILICA HOLDINGS, INC.

file	filename
10-K - FORM 10-K - U.S. SILICA HOLDINGS, INC.	d316539d10k.htm
EX-10.5 - AMENDMENT NO. 4 TO LOAN AND SECURITY AGREEMENT - U.S. SILICA HOLDINGS, INC.	d316539dex105.htm
EX-95.1 - MINE SAFETY DISCLOSURE - U.S. SILICA HOLDINGS, INC.	d316539dex951.htm
EX-31.1 - SECTION 302 CERTIFICATION OF CHIEF EXECUTIVE OFFICER - U.S. SILICA HOLDINGS, INC.	d316539dex311.htm
EX-32.2 - SECTION 906 CERTIFICATION OF CHIEF FINANCIAL OFFICER - U.S. SILICA HOLDINGS, INC.	d316539dex322.htm
EX-31.2 - SECTION 302 CERTIFICATION OF CHIEF FINANCIAL OFFICER - U.S. SILICA HOLDINGS, INC.	d316539dex312.htm
EX-10.7 - AMENDMENT NO. 1 TO SECOND AMENDMENT AND RESTATED CREDIT AGREEMENT - U.S. SILICA HOLDINGS, INC.	d316539dex107.htm
EX-23.1 - CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM - U.S. SILICA HOLDINGS, INC.	d316539dex231.htm
EX-99.1 - CONSENT OF THE FREEDONIA GROUP, INC. - U.S. SILICA HOLDINGS, INC.	d316539dex991.htm
EX-32.1 - SECTION 906 CERTIFICATION OF CHIEF EXECUTIVE OFFICER - U.S. SILICA HOLDINGS, INC.	d316539dex321.htm
EX-24.1 - POWERS OF ATTORNEY - U.S. SILICA HOLDINGS, INC.	d316539dex241.htm

Exhibit 21.1


Name		Jurisdiction of Formation

Hourglass Acquisition I, LLC		Delaware

Preferred Rocks USS Inc.		Delaware

Hourglass Holdings, LLC		Delaware

USS Holdings, Inc.		Delaware

U.S. Silica Company		Delaware

The Fulton Land and Timber Company		Pennsylvania

Pennsylvania Glass Sand Corporation		Delaware

BMAC Services Co. Inc.		Delaware

Coated Sand Solutions, LLC		Delaware

Ottawa Silica Company		Delaware

Ottawa Silica Company, Ltd.		Quebec

U.S. SILICA HOLDINGS, INC. - FORM 10-K - EX-21.1 - LIST OF SUBSIDIARIES OF U.S. SILICA HOLDINGS, INC. - March 20, 2012