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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





FORM 10-Q







|x | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ---------------------------------------------------------------------------------------

For the Quarterly Period Ended September 30, 2012

OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

Commission file number 001-35416







LOGO

U.S. Silica Holdings, Inc.

(Exact name of registrant as specified in its charter)







|                                                               |  |                                     
|-------------------------------------------------------------- |  | ------------------------------------
|Delaware                                                       |  | 26-3718801                          
|(State or other jurisdiction of
Incorporation or Organization) |  | (I.R.S. Employer Identification No.)

8490 Progress Drive, Suite 300

Frederick, Maryland 21701

(Address of Principal Executive Offices) (Zip Code)

(301) 682-0600

(Registrants telephone number, including area code)





Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the
Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past
90 days.    Yes  x    No   ̈

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every
Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).    Yes  x    No   ̈

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller
reporting company. See the definitions of large accelerated filer, accelerated filer and smaller reporting company in Rule 12b-2 of the Exchange Act.



|                        |  |   |  |                           |  |  
|----------------------- |  | - |  | ------------------------- |  | -
|Large accelerated filer |  |  ̈ |  | Non-accelerated filer     |  | x
|                        |  |   | 
|Accelerated filer       |  |  ̈ |  | Smaller reporting company |  |  ̈

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the
Exchange Act).    Yes   ̈    No  x

As of November 2, 2012, 52,846,176 shares of common stock, par value $0.01 per share, of the registrant were outstanding.









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U.S. Silica Holdings, Inc.

FORM 10-Q

For the Quarter Ended September 30, 2012

TABLE OF CONTENTS



|           |  |                                                                                       |     |      |    | 
|---------- |  | ------------------------------------------------------------------------------------- | --- | ---- | -- | 
|           |  |                                                                                       |     | Page |   
|PART I     |  | Financial Information (Unaudited):                                                    |     |      |    | 
|Item 1.    |  | Financial Statements                                                                  |     |      |    | 
|           |  | Condensed Consolidated Balance Sheets                                                 |     |      | 2  | 
|           |  | Condensed Consolidated Statements of Operations                                       |     |      | 3  | 
|           |  | Condensed Consolidated Statements of Comprehensive Income                             |     |      | 4  | 
|           |  | Condensed Consolidated Statements of Cash Flows                                       |     |      | 5  | 
|           |  | Notes to Condensed Consolidated Financial Statements                                  |     |      | 6  | 
|Item 2.    |  | Managements Discussion and Analysis of Financial Condition and Results of Operations |     |      | 20 | 
|Item 3.    |  | Quantitative and Qualitative Disclosures About Market Risk                            |     |      | 35 | 
|Item 4.    |  | Controls and Procedures                                                               |     |      | 36 | 
|           |  |                                                                                      
|PART II    |  | Other Information:                                                                    |     |      |    | 
|Item 1.    |  | Legal Proceedings                                                                     |     |      | 37 | 
|Item 1A.   |  | Risk Factors                                                                          |     |      | 37 | 
|Item 2.    |  | Unregistered Sales of Equity Securities and Use of Proceeds                           |     |      | 38 | 
|Item 3.    |  | Defaults Upon Senior Securities                                                       |     |      | 38 | 
|Item 4.    |  | Mine Safety Disclosures                                                               |     |      | 38 | 
|Item 5.    |  | Other Information                                                                     |     |      | 38 | 
|Item 6.    |  | Exhibits                                                                              |     |      | 38 | 
|Signatures |  |                                                                                       | S-1 |     



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PART IFINANCIAL INFORMATION



|ITEM 1. | FINANCIAL STATEMENTS
|------- | --------------------

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share amounts)



|                                                         |  |                   |         |   |                  |   |         |  
|-------------------------------------------------------- |  | ----------------- | ------- | - | ---------------- | - | ------- | -
|                                                         |  | September 30,2012 |         |   | December 31,2011 |  
|                                                         |  | (unaudited)       |         |   |                  |  
|ASSETS                                                   | 
|Current Assets:                                          |  |                   |         |   |                  |   |         |  
|Cash and cash equivalents                                |  | $                 | 93,010  |   |                  | $ | 59,199  |  
|Accounts receivable, net                                 |  |                   | 59,471  |   |                  |   | 46,600  |  
|Inventories                                              |  |                   | 36,228  |   |                  |   | 29,307  |  
|Prepaid expenses and other current assets                |  |                   | 8,599   |   |                  |   | 8,561   |  
|Deferred income tax, net                                 |  |                   | 11,171  |   |                  |   | 28,007  |  
|Income tax receivable                                    |  |                   |        |   |                  |   | 3,895   |  
|                                                         |  |                   |         |   |                  |   |         |  
|Total current assets                                     |  |                   | 208,479 |   |                  |   | 175,569 |  
|                                                         |  |                   |         |   |                  |   |         |  
|Property, plant and mine development, net                |  |                   | 393,756 |   |                  |   | 336,788 |  
|Debt issuance costs, net                                 |  |                   | 2,215   |   |                  |   | 1,291   |  
|Goodwill                                                 |  |                   | 68,403  |   |                  |   | 68,403  |  
|Trade names                                              |  |                   | 10,436  |   |                  |   | 10,436  |  
|Customer relationships, net                              |  |                   | 6,634   |   |                  |   | 6,942   |  
|Other assets                                             |  |                   | 7,266   |   |                  |   | 6,367   |  
|                                                         |  |                   |         |   |                  |   |         |  
|Total assets                                             |  | $                 | 697,189 |   |                  | $ | 605,796 |  
|                                                         |  |                   |         |   |                  |   |         |  
|LIABILITIES AND STOCKHOLDERS EQUITY                     | 
|Current Liabilities:                                     |  |                   |         |   |                  |   |         |  
|Book overdraft                                           |  | $                 | 6,498   |   |                  | $ | 5,588   |  
|Accounts payable                                         |  |                   | 39,598  |   |                  |   | 36,579  |  
|Accrued liabilities                                      |  |                   | 9,415   |   |                  |   | 9,875   |  
|Accrued interest                                         |  |                   | 120     |   |                  |   | 1,659   |  
|Current portion of long-term debt                        |  |                   | 6,364   |   |                  |   | 6,364   |  
|Income tax payable                                       |  |                   | 10,197  |   |                  |   |        |  
|Current portion of deferred revenue                      |  |                   | 6,118   |   |                  |   | 10,393  |  
|                                                         |  |                   |         |   |                  |   |         |  
|Total current liabilities                                |  |                   | 78,310  |   |                  |   | 70,458  |  
|                                                         |  |                   |         |   |                  |   |         |  
|Long-term debt                                           |  |                   | 253,600 |   |                  |   | 255,425 |  
|Note payable to parent                                   |  |                   |        |   |                  |   | 15,000  |  
|Liability for pension and other post-retirement benefits |  |                   | 47,630  |   |                  |   | 52,078  |  
|Deferred revenue                                         |  |                   | 946     |   |                  |   | 2,128   |  
|Deferred income tax, net                                 |  |                   | 64,813  |   |                  |   | 75,915  |  
|Other long-term obligations                              |  |                   | 13,702  |   |                  |   | 12,858  |  
|                                                         |  |                   |         |   |                  |   |         |  
|Total liabilities                                        |  |                   | 459,001 |   |                  |   | 483,862 |  
|                                                         |  |                   |         |   |                  |   |         |  
|Commitments and contingencies                            |  |                   |         |   |                  |   |         |  
|                                                         |  |                  
|Stockholders Equity:                                    |  |                   |         |   |                  |   |         |  
|Common stock                                             |  |                   | 529     |   |                  |   | 500     |  
|Preferred stock                                          |  |                   |        |   |                  |   |        |  
|Additional paid-in capital                               |  |                   | 162,911 |   |                  |   | 103,757 |  
|Retained earnings                                        |  |                   | 87,398  |   |                  |   | 30,038  |  
|Treasury stock, at cost                                  |  |                   | (1,050  | ) |                  |   |        |  
|Accumulated other comprehensive loss                     |  |                   | (11,600 | ) |                  |   | (12,361 | )
|                                                         |  |                   |         |   |                  |   |         |  
|Total stockholders equity                               |  |                   | 238,188 |   |                  |   | 121,934 |  
|                                                         |  |                   |         |   |                  |   |         |  
|Total liabilities and stockholders equity               |  | $                 | 697,189 |   |                  | $ | 605,796 |  
|                                                         |  |                   |         |   |                  |   |         |  

The accompanying notes are an integral part of these financial statements.



2



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U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited; in thousands, except per share amounts)



|                                                                        |  |                                  |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|----------------------------------------------------------------------- |  | -------------------------------- | ------- | - | ------------------------------ | - | ------ | ---- |  | - | ------- | - |  | - | ------- | -
|                                                                        |  | Three Months 
EndedSeptember 30, |         |   | Nine Months EndedSeptember 30, |  
|                                                                        |  | 2012                             |         |   | 2011                           |   |        | 2012 |  |   | 2011    |  
|Sales                                                                   |  | $                                | 115,885 |   |                                | $ | 73,453 |      |  | $ | 323,075 |   |  | $ | 211,965 |  
|Cost of goods sold (excluding depreciation, depletion and amortization) |  |                                  | 69,706  |   |                                |   | 45,241 |      |  |   | 185,547 |   |  |   | 131,145 |  
|Operating expenses:                                                     |  |                                  |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Selling, general and administrative                                     |  |                                  | 10,135  |   |                                |   | 5,215  |      |  |   | 29,757  |   |  |   | 16,491  |  
|Advisory fee to parent                                                  |  |                                  |        |   |                                |   | 313    |      |  |   |        |   |  |   | 938     |  
|Depreciation, depletion and amortization                                |  |                                  | 5,968   |   |                                |   | 5,295  |      |  |   | 17,920  |   |  |   | 15,636  |  
|                                                                        |  |                                  |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|                                                                        |  |                                  | 16,103  |   |                                |   | 10,823 |      |  |   | 47,677  |   |  |   | 33,065  |  
|                                                                        |  |                                  |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Operating income                                                        |  |                                  | 30,076  |   |                                |   | 17,389 |      |  |   | 89,851  |   |  |   | 47,755  |  
|Other (expense) income:                                                 |  |                                  |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Interest expense                                                        |  |                                  | (3,326  | ) |                                |   | (3,832 | )    |  |   | (10,551 | ) |  |   | (14,505 | )
|Early extinguishment of debt                                            |  |                                  |        |   |                                |   |       |      |  |   |        |   |  |   | (6,043  | )
|Other income, net, including interest income                            |  |                                  | 348     |   |                                |   | 197    |      |  |   | 681     |   |  |   | 534     |  
|                                                                        |  |                                  |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|                                                                        |  |                                  | (2,978  | ) |                                |   | (3,635 | )    |  |   | (9,870  | ) |  |   | (20,014 | )
|                                                                        |  |                                  |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Income before income taxes                                              |  |                                  | 27,098  |   |                                |   | 13,754 |      |  |   | 79,981  |   |  |   | 27,741  |  
|Income tax expense                                                      |  |                                  | (8,302  | ) |                                |   | (3,412 | )    |  |   | (22,621 | ) |  |   | (7,533  | )
|                                                                        |  |                                  |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Net income                                                              |  | $                                | 18,796  |   |                                | $ | 10,342 |      |  | $ | 57,360  |   |  | $ | 20,208  |  
|                                                                        |  |                                  |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Earnings per share:                                                     |  |                                  |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Basic                                                                   |  | $                                | 0.36    |   |                                | $ | 0.21   |      |  | $ | 1.09    |   |  | $ | 0.40    |  
|Diluted                                                                 |  | $                                | 0.36    |   |                                | $ | 0.21   |      |  | $ | 1.09    |   |  | $ | 0.40    |  

The accompanying notes are an integral part of these financial statements.



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U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(unaudited; in thousands)



|                                                                                                                                                                                                                                               |  |                                  |        |  |                                 |   |        |      |  |   |        |  |  |   |        |  
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | -------------------------------- | ------ |  | ------------------------------- | - | ------ | ---- |  | - | ------ |  |  | - | ------ | -
|                                                                                                                                                                                                                                               |  | Three Months 
EndedSeptember 30, |        |  | Nine Months 
EndedSeptember 30, |  
|                                                                                                                                                                                                                                               |  | 2012                             |        |  | 2011                            |   |        | 2012 |  |   | 2011   | 
|Net income                                                                                                                                                                                                                                     |  | $                                | 18,796 |  |                                 | $ | 10,342 |      |  | $ | 57,360 |  |  | $ | 20,208 |  
|Other comprehensive income:                                                                                                                                                                                                                    |  |                                  |        |  |                                 |   |        |      |  |   |        |  |  |   |        |  
|Unrealized gain (loss) on derivatives (net of tax of $83 and $108 for the three and nine months ended September 30, 2012,
respectively, and $(9) and $55 for the three and nine months ended September 30, 2011, respectively)                 |  |                                  | 2      |  |                                 |   | (76    | )    |  |   | 163    |  |  |   | (2     | )
|Pension and other post-retirement benefits liability adjustment (net of tax of $88 and $381 for the three and nine months
ended September 30, 2012, respectively, and $ for the three and nine months ended September 30, 2011, respectively) |  |                                  | 137    |  |                                 |   |       |      |  |   | 598    |  |  |   |       |  
|                                                                                                                                                                                                                                               |  |                                  |        |  |                                 |   |        |      |  |   |        |  |  |   |        |  
|Comprehensive income                                                                                                                                                                                                                           |  | $                                | 18,935 |  |                                 | $ | 10,266 |      |  | $ | 58,121 |  |  | $ | 20,206 |  
|                                                                                                                                                                                                                                               |  |                                  |        |  |                                 |   |        |      |  |   |        |  |  |   |        |  
|                                                                                                                                                                                                                                               |  |                                  |        |  |                                 |   |        |      |  |   |        |  |  |   |        |  

The accompanying notes are an integral part of these financial statements.



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U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited; in thousands)



|                                                                                  |  |                                |         |   |      |   |          |  
|--------------------------------------------------------------------------------- |  | ------------------------------ | ------- | - | ---- | - | -------- | -
|                                                                                  |  | Nine Months
EndedSeptember 30, |        
|                                                                                  |  | 2012                           |         |   | 2011 |  
|Operating activities:                                                             |  |                                |         |   |      |   |          |  
|Net income                                                                        |  | $                              | 57,360  |   |      | $ | 20,208   |  
|Adjustments to reconcile net income to net cash provided by operating activities: |  |                                |         |   |      |   |          |  
|Depreciation, depletion and amortization                                          |  |                                | 17,920  |   |      |   | 15,636   |  
|Debt issuance amortization                                                        |  |                                | 381     |   |      |   | 188      |  
|Original issue discount amortization                                              |  |                                | 126     |   |      |   | 115      |  
|Loss on early extinguishment of debt                                              |  |                                |        |   |      |   | 6,043    |  
|Deferred income taxes                                                             |  |                                | 5,734   |   |      |   | 2,419    |  
|(Gain)/loss on disposal of property, plant and equipment                          |  |                                | (469    | ) |      |   | 6        |  
|Deferred revenue                                                                  |  |                                | (5,457  | ) |      |   | (4,754   | )
|Equity-based compensation                                                         |  |                                | 1,662   |   |      |   | 682      |  
|Other                                                                             |  |                                | 437     |   |      |   | 217      |  
|Changes in assets and liabilities:                                                |  |                                |         |   |      |   |          |  
|Accounts receivable                                                               |  |                                | (13,102 | ) |      |   | (8,705   | )
|Inventories                                                                       |  |                                | (6,921  | ) |      |   | (3,462   | )
|Prepaid expenses and other current assets                                         |  |                                | (38     | ) |      |   | (1,261   | )
|Income taxes                                                                      |  |                                | 14,092  |   |      |   | 1,061    |  
|Accounts payable and accrued liabilities                                          |  |                                | 10,559  |   |      |   | 2,493    |  
|Advisory services termination fee to parent                                       |  |                                | (8,000  | ) |      |   |         |  
|Accrued interest                                                                  |  |                                | 153     |   |      |   | 1,121    |  
|Liability for pension and other post-retirement benefits                          |  |                                | (4,448  | ) |      |   | (9,612   | )
|                                                                                  |  |                                |         |   |      |   |          |  
|Net cash provided by operating activities                                         |  |                                | 69,989  |   |      |   | 22,395   |  
|                                                                                  |  |                                |         |   |      |   |          |  
|Investing activities:                                                             |  |                                |         |   |      |   |          |  
|Capital expenditures                                                              |  |                                | (74,868 | ) |      |   | (28,753  | )
|Proceeds from sale of property, plant and equipment                               |  |                                | 1,255   |   |      |   | 61       |  
|                                                                                  |  |                                |         |   |      |   |          |  
|Net cash used in investing activities                                             |  |                                | (73,613 | ) |      |   | (28,692  | )
|                                                                                  |  |                                |         |   |      |   |          |  
|Financing activities:                                                             |  |                                |         |   |      |   |          |  
|Proceeds from issuance of common stock in initial public offering                 |  |                                | 50,000  |   |      |   |         |  
|Repurchase of common stock                                                        |  |                                | (1,072  | ) |      |   |         |  
|Issuance of treasury stock                                                        |  |                                | 22      |   |      |   |         |  
|Issuance of long-term debt                                                        |  |                                |        |   |      |   | 259,061  |  
|Repayment of long-term debt                                                       |  |                                | (1,950  | ) |      |   | (239,826 | )
|Change in book overdraft                                                          |  |                                | 910     |   |      |   | 1,836    |  
|Prepayment penalties                                                              |  |                                |        |   |      |   | (1,500   | )
|Financing fees                                                                    |  |                                | (1,304  | ) |      |   | (3,965   | )
|Common stock issuance costs                                                       |  |                                | (9,171  | ) |      |   |         |  
|                                                                                  |  |                                |         |   |      |   |          |  
|Net cash provided by financing activities                                         |  |                                | 37,435  |   |      |   | 15,606   |  
|                                                                                  |  |                                |         |   |      |   |          |  
|Net increase in cash and cash equivalents                                         |  |                                | 33,811  |   |      |   | 9,309    |  
|Cash and cash equivalents, beginning of period                                    |  |                                | 59,199  |   |      |   | 64,500   |  
|                                                                                  |  |                                |         |   |      |   |          |  
|Cash and cash equivalents, end of period                                          |  | $                              | 93,010  |   |      | $ | 73,809   |  
|                                                                                  |  |                                |         |   |      |   |          |  
|                                                                                  |  |                               
|Non-cash financing activities:                                                    |  |                                |         |   |      |   |          |  
|Contribution of note payable and accrued interest by parent                       |  | $                              | 16,692  |   |      |   |         |  
|                                                                                  |  |                               
|Supplemental cash flow information:                                               |  |                                |         |   |      |   |          |  
|Cash paid during the period for:                                                  |  |                                |         |   |      |   |          |  
|Interest                                                                          |  | $                              | 9,339   |   |      | $ | 12,440   |  
|Taxes                                                                             |  | $                              | 3,253   |   |      | $ | 4,034    |  

The accompanying notes are an integral part of these financial statements.



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U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)

NOTE AORGANIZATION

U.S. Silica Holdings, Inc. (Holdings, and together with its subsidiaries we, us or
the Company), formerly GGC USS Holdings, Inc., was organized as a holding company on November 14, 2008. On November 25, 2008, we acquired Hourglass Acquisitions I, LLC, whose only operating subsidiary was U.S. Silica Company
(U.S. Silica).

On January 31, 2012, we completed an initial public offering of common stock (the
IPO) through a Registration Statement on Form S-1 (File No. 333-175636), pursuant to which we registered 2,941,176 shares of our common stock, and we registered and certain of our stockholders sold 8,823,529 shares common stock at
an offering price of $17.00 per share. On February 6, 2012, we sold all 2,941,176 shares of common stock for an aggregate offering price of approximately $50.0 million and the selling stockholders sold all 8,823,529 shares of common stock for
an aggregate offering price of approximately $150.0 million. As a result of the offering, we received net proceeds of approximately $40.8 million, after deducting $3.5 million of underwriting discounts and commissions and offering expenses of
$5.7 million.

On January 31, 2012, simultaneously with the initial public offering of our common stock, GGC USS
Holdings, LLC, our parent and sole stockholder prior to the IPO and now our largest stockholder, contributed to us all of the stock of its wholly-owned subsidiary, GGC RCS Holdings, Inc., and its operating subsidiary, Coated Sand Solutions, LLC.
Prior to this transaction, GGC RCS Holdings, Inc. had a $15.0 million note payable to GGC USS Holdings, LLC which, together with accrued interest of $1.7 million, was converted to an equity contribution by GGC USS Holdings, LLC, simultaneously with
the IPO. Coated Sand Solutions, LLC is currently developing resin-coated sand proppants for sale into the Oil and Gas market for use in the hydraulic fracturing process.

NOTE BSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The condensed consolidated financial statements as of and for the three and nine months ended September 30, 2012 and 2011 (the
Financial Statements), present the financial position, results of operations, and cash flows of the Company. In consideration of the contribution of GGC RCS Holdings, Inc. to us on January 31, 2012, we and our subsidiaries are
presented on a consolidated basis with GGC RCS Holdings, Inc. as of the three and nine months ended September 30, 2012. As of December 31, 2011 and for the three and nine months ended September 30, 2011, we and our subsidiaries are
presented on a combined basis with GGC RCS Holdings, Inc.

We have condensed or omitted certain information and footnote
disclosures normally included in financial statements presented in accordance with U.S. generally accepted accounting principles (GAAP). Although we believe our disclosures are adequate to make the information presented not misleading,
you should read the Financial Statements in this report in conjunction with the combined financial statements and notes to those financial statements in our Annual Report on Form 10-K for the fiscal year ended December 31, 2011, as filed with
the Securities and Exchange Commission (SEC) on March 20, 2012 (our 2011 Annual Report). Certain terms not otherwise defined in this Quarterly Report on Form 10-Q, have the meanings specified in our 2011 Annual Report.

In our opinion, our Financial Statements reflect all normal and recurring adjustments necessary to present fairly our
financial position as of September 30, 2012, and December 31, 2011, the results of our operations for the three and nine months ended September 30, 2012 and 2011, and our cash flows for the nine months ended September 30, 2012
and 2011. Interim results may not be indicative of fiscal year performance because of seasonal and short-term variations. We have eliminated all material intercompany transactions and balances between entities consolidated in these Financial
Statements. We have also reclassified certain prior year amounts to conform to our 2012 presentation. These classifications relate specifically to the presentation of advisory fees paid to Golden Gate Capital and have no effect on our net income.

In order to make this report easier to read, we refer throughout to (i) our Condensed Consolidated Balance Sheets as our
Balance Sheets, and (ii) our Condensed Consolidated Statements of Operations as our Income Statements.



6



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##### Table of Contents

U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



Use of Estimates

The preparation of the Financial Statements requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent
assets and liabilities at the date of the Financial Statements and the reported amounts of revenues and expenses during the reporting period. The more significant areas requiring the use of management estimates and assumptions relate to mineral
reserves that are the basis for future cash flow estimates utilized in impairment calculations and units-of-production amortization calculations; environmental, reclamation and closure obligations; estimates of recoverable minerals; estimates of
fair value for certain reporting units and asset impairments (including impairments of goodwill and other long-lived assets); write-downs of inventory to net realizable value; post-employment, post-retirement and other employee benefit liabilities;
valuation allowances for deferred tax assets; reserves for contingencies and litigation; and the fair value and accounting treatment of financial instruments including derivative instruments. The Company bases its estimates on historical experience
and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may differ significantly from these estimates under different assumptions or conditions.

Unaudited Interim Financial Statements

The accompanying Balance Sheet as of September 30, 2012, the Income Statements for the three and nine months ended September 30,
2012 and 2011; the Condensed Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2012 and 2011; the Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2012
and 2011; and other information disclosed in the related notes, are unaudited. The Balance Sheet as of December 31, 2011 was derived from our audited consolidated financial statements as included in our 2011 Annual Report. The accompanying
Financial Statements should be read in conjunction with the audited combined financial statements and related notes contained in our 2011 Annual Report.

Recently Issued Accounting Pronouncements

In July 2012, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update 2012-02,
IntangiblesGoodwill and Other: Testing Indefinite-Lived Intangible Assets for Impairment(ASU 2012-02). The intent of ASU 2012-02 is to simplify how registrants test indefinite-lived intangible asset for impairment and to
improve consistency in impairment testing guidance among long-lived asset categories. ASU 2012-02 permits registrants to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is
impaired as a basis for determining whether it is necessary to perform the quantitative impairment test in accordance with U.S. GAAP. An entity will have an option not to calculate annually the fair value of an indefinite-lived intangible asset if
the entity determines that it is not more likely than not that the asset is impaired. ASU 2012-02 is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012, with early adoption permitted.
The Company will adopt the guidance on October 1, 2012, as required, and we believe the adoption of this guidance will not have a material impact on our financial position, results of operations or cash flows.

Recently Adopted Accounting Pronouncements

In May 2011, the FASB issued changes to conform existing guidance regarding fair value measurement and disclosure between GAAP and
International Financial Reporting Standards. These changes both clarify the FASBs intent about the application of existing fair value measurement and disclosure requirements and amend certain principles or requirements for measuring fair value
or for disclosing information about fair value measurements. The clarifying changes relate to the application of the highest and best use and valuation premise concepts, measuring the fair value of an instrument classified in a reporting
entitys stockholders equity, and disclosure of quantitative information about unobservable inputs used for Level 3 fair value measurements. The amendments relate to measuring the fair value of financial instruments that are managed
within a portfolio; application of premiums and discounts in a fair value measurement; and additional disclosures concerning the valuation processes used and sensitivity of the fair value measurement to changes in unobservable inputs for those items
categorized as Level 3, a reporting entitys use of a nonfinancial asset in a way that differs from the assets highest and best use, and the categorization by level in the fair value hierarchy for items required to be measured at fair
value for disclosure purposes only. We adopted this guidance, effective January 1, 2012, with no material impact on our Financial Statements.

In June 2011, the FASB issued changes to the presentation of comprehensive
income. These changes give an entity the option to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two
separate but consecutive



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U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



statements; the option to present components of other comprehensive income as part of the statement of changes in stockholders equity was eliminated. The items that must be reported in
other comprehensive income or when an item of other comprehensive income must be reclassified to net income were not changed. Additionally, no changes were made to the calculation and presentation of earnings per share. We adopted this guidance,
effective January 1, 2012, with no material impact on our Financial Statements. See Note D and Note L for related disclosures.

In September 2011, the FASB issued changes to the testing of goodwill for impairment.
These changes provide an entity the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not (more than 50%) that the fair value of a reporting
unit is less than its carrying amount. Such qualitative factors may include the following: macroeconomic conditions; industry and market considerations; cost factors; overall financial performance; and other relevant entity-specific events. If an
entity elects to perform a qualitative assessment and determines that an impairment is more likely than not, the entity is then required to perform the existing two-step quantitative impairment test, otherwise no further analysis is required. An
entity also may elect not to perform the qualitative assessment and, instead, go directly to the two-step quantitative impairment test. These changes become effective for us for any goodwill impairment test performed on January 1, 2012 or
later, although early adoption is permitted. We adopted this guidance, effective January 1, 2012 with no material impact on our Financial Statements.

NOTE CEARNINGS PER SHARE

Basic income per common share is computed by dividing income available to common stockholders by the weighted average
number of common shares outstanding for the period. Diluted income per common share is computed similarly to basic income per common share except that the weighted average number of common shares outstanding is increased to include the number of
additional common shares that would have been outstanding if the potentially dilutive common shares had been issued. In accordance with the applicable accounting guidance for calculating earnings per share, we did not include in our calculation of
diluted earnings per share for the applicable periods, stock options where the exercise prices were greater than the average market prices.



|                                                                                      |  |                                 |        |  |                                |   |        |      |  |   |        |  |  |   |        | 
|------------------------------------------------------------------------------------- |  | ------------------------------- | ------ |  | ------------------------------ | - | ------ | ---- |  | - | ------ |  |  | - | ------ | 
|                                                                                      |  | Three Months
EndedSeptember 30, |        |  | Nine Months
EndedSeptember 30, |  
|                                                                                      |  | 2012                            |        |  | 2011                           |   |        | 2012 |  |   | 2011   | 
|Net income attributable to U.S. Silica Holdings, Inc. stockholders:                   |  | $                               | 18,796 |  |                                | $ | 10,342 |      |  | $ | 57,360 |  |  | $ | 20,208 | 
|                                                                                      |  |                                 |        |  |                                |   |        |      |  |   |        |  |  |   |        | 
|                                                                                      |  | $                               | 18,796 |  |                                | $ | 10,342 |      |  | $ | 57,360 |  |  | $ | 20,208 | 
|                                                                                      |  |                                 |        |  |                                |   |        |      |  |   |        |  |  |   |        | 
|Weighted average common shares (thousands):                                           |  |                                 |        |  |                                |   |        |      |  |   |        |  |  |   |        | 
|Basic                                                                                 |  |                                 | 52,873 |  |                                |   | 50,000 |      |  |   | 52,585 |  |  |   | 50,000 | 
|Effect of employee stock based awards                                                 |  |                                 | 14     |  |                                |   |       |      |  |   | 43     |  |  |   |       | 
|                                                                                      |  |                                 |        |  |                                |   |        |      |  |   |        |  |  |   |        | 
|Diluted                                                                               |  |                                 | 52,887 |  |                                |   | 50,000 |      |  |   | 52,628 |  |  |   | 50,000 | 
|                                                                                      |  |                                 |        |  |                                |   |        |      |  |   |        |  |  |   |        | 
|Net income attributable to U.S. Silica Holdings, Inc. stockholders, per common share: |  |                                 |        |  |                                |   |        |      |  |   |        |  |  |   |        | 
|Basic                                                                                 |  | $                               | 0.36   |  |                                | $ | 0.21   |      |  | $ | 1.09   |  |  | $ | 0.40   | 
|Diluted                                                                               |  | $                               | 0.36   |  |                                | $ | 0.21   |      |  | $ | 1.09   |  |  | $ | 0.40   | 



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##### Table of Contents

U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



NOTE DCAPITAL STRUCTURE AND ACCUMULATED COMPREHENSIVE INCOME

Common Stock

Our Amended and Restated Certificate of Incorporation, authorizes up to 500,000,000 shares of common stock, par value of $0.01. Subject to the rights of holders of any series of preferred stock, all of
the voting power of the stockholders of the Corporation shall be vested in the holders of the common stock. There are 52,843,176 shares of common stock issued and outstanding at September 30, 2012. As of September 30, 2011, there were
50,000,000 shares issued and outstanding. We anticipate that we will retain all of our future earnings for use in the development and expansion of our business and for general corporate purposes. Any determination to pay dividends and other
distributions in cash, stock, or property by Holdings in the future will be at the discretion of our Board of Directors and will be dependent on then-existing conditions, including our business conditions, our financial condition, results of
operations, liquidity, capital requirements, contractual restrictions including restrictive covenants contained in our debt agreements, and other factors. Additionally, because we are a holding company, our ability to pay dividends on our common
stock is limited by restrictions on the ability of our subsidiaries to pay dividends or make distributions to us, including restrictions under the terms of the agreements governing our indebtedness.

Preferred Stock

Our Amended and Restated Certificate of Incorporation authorizes our Board of Directors to issue up to 10,000,000 shares, in the
aggregate, of preferred stock, par value of $0.01 in one or more series and to fix the preferences, powers and relative, participating, optional or other special rights and qualifications, limitations or restrictions thereof, including the dividend
rate, conversion rights, voting rights, redemption rights and liquidation preference and to fix the number of shares to be included in any such series without any further vote or action by our stockholders.

There are no shares of preferred stock issued or outstanding at September 30, 2012 and 2011. At present, we have no plans to issue
any preferred stock.

Initial Public Offering

On January 31, 2012, we completed an initial public offering of 2,941,176 shares of our common stock at an offering price of $17.00 per share for an aggregate offering price of approximately $50.0
million. As a result of the offering, we received net proceeds of approximately $40.8 million, after deducting $3.5 million of underwriting discounts and commissions and offering expenses of $5.7 million.

Simultaneously with the initial public offering of our common stock, GGC USS Holdings, LLC, our parent and sole stockholder prior to the
IPO and now our largest stockholder, contributed to us all of the stock of its wholly-owned subsidiary, GGC RCS Holdings, Inc., and its operating subsidiary, Coated Sand Solutions, LLC. Prior to this transaction, GGC RCS Holdings, Inc. had a $15.0
million note payable to GGC USS Holdings, LLC, which, together with accrued interest of $1.7 million, was converted to an equity contribution by GGC USS Holdings, LLC.

Share Repurchase Program

On June 11, 2012, our Board of
Directors authorized us to repurchase up to $25.0 million of our common stock. The authorization remains open for a period of 18 months, concluding on December 11, 2013. We are authorized to repurchase, from time to time, shares of our
outstanding common stock on the open market or in privately negotiated transactions using available cash. The timing and amount of stock repurchases will depend on a variety of factors, including market conditions and corporate and regulatory
considerations. The share repurchase program may be suspended, modified or discontinued at any time, and we have no obligation to repurchase any additional amount of our common stock under the program. We intend to make all repurchases in compliance
with applicable regulatory guidelines and to administer the plan in accordance with applicable laws, including Rule 10b-18 of the Securities Exchange Act of 1934, as amended.

As of September 30, 2012, we have repurchased 100,000 shares of our common stock, at an average price of $10.72 and have the authorization to repurchase up to an additional $23.9 million of our
common stock under the program.



9



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##### Table of Contents

U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



The following table presents the activity included in stockholders equity during
the nine months ended September 30, 2012.



|                                                                                                                     |  |             |     |  |                          |   |         |                  |  |   |                        |  |  |                                             |        |   |                          |   |         |   |  |   |         |  
|-------------------------------------------------------------------------------------------------------------------- |  | ----------- | --- |  | ------------------------ | - | ------- | ---------------- |  | - | ---------------------- |  |  | ------------------------------------------- | ------ | - | ------------------------ | - | ------- | - |  | - | ------- | -
|                                                                                                                     |  | CommonStock |     |  | AdditionalPaid-InCapital |   |         | RetainedEarnings |  |   | TreasuryStock, at cost |  |  | AccumulatedOtherComprehensiveIncome
 (Loss) |        |   | TotalStockholdersEquity |  
|Balance at December 31, 2011                                                                                         |  | $           | 500 |  |                          | $ | 103,757 |                  |  | $ | 30,038                 |  |  | $                                           |       |   |                          | $ | (12,361 | ) |  | $ | 121,934 |  
|Issuance of common stock (January 2012 initial public offering at $17.00 per share, net of issuance costs of
$9,171) |  |             | 29  |  |                          |   | 40,800  |                  |  |   |                       |  |  |                                             |       |   |                          |   |        |   |  |   | 40,829  |  
|Repurchase of common stock                                                                                           |  |             |    |  |                          |   |        |                  |  |   |                       |  |  |                                             | (1,072 | ) |                          |   |        |   |  |   | (1,072  | )
|Issuance of treasury stock                                                                                           |  |             |    |  |                          |   |        |                  |  |   |                       |  |  |                                             | 22     |   |                          |   |        |   |  |   | 22      |  
|Capital contributed by parent                                                                                        |  |             |    |  |                          |   | 16,692  |                  |  |   |                       |  |  |                                             |       |   |                          |   |        |   |  |   | 16,692  |  
|Equity-based compensation                                                                                            |  |             |    |  |                          |   | 1,662   |                  |  |   |                       |  |  |                                             |       |   |                          |   |        |   |  |   | 1,662   |  
|Net income                                                                                                           |  |             |    |  |                          |   |        |                  |  |   | 57,360                 |  |  |                                             |       |   |                          |   |        |   |  |   | 57,360  |  
|Other comprehensive income                                                                                           |  |             |    |  |                          |   |        |                  |  |   |                       |  |  |                                             |       |   |                          |   | 761     |   |  |   | 761     |  
|                                                                                                                     |  |             |     |  |                          |   |         |                  |  |   |                        |  |  |                                             |        |   |                          |   |         |   |  |   |         |  
|Balance at September 30, 2012                                                                                        |  | $           | 529 |  |                          | $ | 162,911 |                  |  | $ | 87,398                 |  |  | $                                           | (1,050 | ) |                          | $ | (11,600 | ) |  | $ | 238,188 |  

Accumulated comprehensive income (loss) consists of fair value adjustments associated with cash flow hedges and
accumulated adjustments for net experience losses and prior service cost related to employee benefit plans. Accumulated other comprehensive income (loss), net of tax, at September 30, 2012 consisted of the following:



|                                                                |  |                                            |         |  
|--------------------------------------------------------------- |  | ------------------------------------------ | ------- | -
|                                                                |  | AccumulatedOtherComprehensiveIncome (Loss) |        
|Unrealized loss on derivatives                                  |  | $                                          | (246    | )
|Pension and other post-retirement benefits liability adjustment |  |                                            | (11,354 | )
|                                                                |  |                                            |         |  
|Accumulated other comprehensive income (loss)                   |  | $                                          | (11,600 | )
|                                                                |  |                                            |         |  

NOTE EACCOUNTS RECEIVABLE

At September 30, 2012 and December 31 2011, accounts receivable consisted of the following:



|                                      |  |                   |        |   |                  |   |        |  
|------------------------------------- |  | ----------------- | ------ | - | ---------------- | - | ------ | -
|                                      |  | September 30,2012 |        |   | December 31,2011 |  
|Trade receivables                     |  | $                 | 59,813 |   |                  | $ | 46,044 |  
|Less: Allowance for doubtful accounts |  |                   | (1,010 | ) |                  |   | (779   | )
|                                      |  |                   |        |   |                  |   |        |  
|Net trade receivables                 |  |                   | 58,803 |   |                  |   | 45,265 |  
|Other receivables                     |  |                   | 668    |   |                  |   | 1,335  |  
|                                      |  |                   |        |   |                  |   |        |  
|Total accounts receivable             |  | $                 | 59,471 |   |                  | $ | 46,600 |  
|                                      |  |                   |        |   |                  |   |        |  

Changes in our allowance for doubtful accounts during the nine months ended September 30, 2012 are as follows:



|                     |  |                                |       |  
|-------------------- |  | ------------------------------ | ----- | -
|                     |  | Allowance 
forDoubtfulAccounts |      
|Beginning balance    |  | $                              | 779   |  
|Bad debt provision   |  |                                | 240   |  
|Accounts written off |  |                                | (9    | )
|                     |  |                                |       |  
|Ending balance       |  | $                              | 1,010 |  
|                     |  |                                |       |  

Our five largest customers accounted for approximately 30% and 28% of sales in the three months ended
September 30, 2012 and 2011, respectively, and 29% and 27% during the nine months ended September 30, 2012 and 2011, respectively. No single individual customer accounted for more than 10% of sales in the nine months ended
September 30, 2012 and 2011, respectively.





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U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



NOTE FINVENTORIES

At September 30, 2012 and December 31, 2011, inventories consisted of the following:



|                                  |  |                   |        |  |                  |   |        | 
|--------------------------------- |  | ----------------- | ------ |  | ---------------- | - | ------ | 
|                                  |  | September 30,2012 |        |  | December 31,2011 |  
|Supplies                          |  | $                 | 13,197 |  |                  | $ | 12,671 | 
|Raw materials and work in process |  |                   | 9,267  |  |                  |   | 8,671  | 
|Finished goods                    |  |                   | 13,764 |  |                  |   | 7,965  | 
|                                  |  |                   |        |  |                  |   |        | 
|Total inventories                 |  | $                 | 36,228 |  |                  | $ | 29,307 | 
|                                  |  |                   |        |  |                  |   |        | 

Inventories include spare parts and supplies for routine facilities maintenance, raw stockpiles and silica and other
industrial sand available for shipment. We value inventory at the lower of cost or market. Cost is determined using the first-in, first-out and average cost methods.

NOTE GPROPERTY, PLANT AND MINE DEVELOPMENT

At September 30, 2012 property, plant and mine development consisted of the
following:



|                                     |  |                          |          |  |                                      |   |         |               |  |   |          | 
|------------------------------------ |  | ------------------------ | -------- |  | ------------------------------------ | - | ------- | ------------- |  | - | -------- | 
|                                     |  | As of September 30, 2012 |         
|                                     |  | Cost                     |          |  | AccumulatedDepreciation/Amortization |   |         | Net BookValue | 
|Mining property and mine development |  | $                        | 156,288  |  |                                      | $ | (14,670 | )             |  | $ | 141,618  | 
|Asset retirement cost                |  |                          | 8,362    |  |                                      |   | (1,121  | )             |  |   | 7,241    | 
|Land                                 |  |                          | 32,917   |  |                                      |   |        |               |  |   | 32,917   | 
|Land improvements                    |  |                          | 10,796   |  |                                      |   | (3,588  | )             |  |   | 7,208    | 
|Buildings                            |  |                          | 16,546   |  |                                      |   | (3,933  | )             |  |   | 12,613   | 
|Machinery and equipment              |  |                          | 159,918  |  |                                      |   | (48,873 | )             |  |   | 111,045  | 
|Furniture and fixtures               |  |                          | 581      |  |                                      |   | (115    | )             |  |   | 466      | 
|                                     |  |                          |          |  |                                      |   |         |               |  |   |          | 
|                                     |  |                          | 385,408  |  |                                      |   | (72,300 | )             |  |   | 313,108  | 
|Construction-in-progress             |  |                          | 80,648   |  |                                      |   |        |               |  |   | 80,648   | 
|                                     |  |                          |          |  |                                      |   |         |               |  |   |          | 
|                                     |  |                          | $466,056 |  |                                      | $ | (72,300 | )             |  |   | $393,756 | 
|                                     |  |                          |          |  |                                      |   |         |               |  |   |          | 

At December 31, 2011 property, plant and mine development consisted of the following:



|                                     |  |                         |         |  |                                      |   |         |               |  |   |         | 
|------------------------------------ |  | ----------------------- | ------- |  | ------------------------------------ | - | ------- | ------------- |  | - | ------- | 
|                                     |  | As of December 31, 2011 |        
|                                     |  | Cost                    |         |  | AccumulatedDepreciation/Amortization |   |         | Net BookValue | 
|Mining property and mine development |  | $                       | 155,182 |  |                                      | $ | (11,486 | )             |  | $ | 143,696 | 
|Asset retirement cost                |  |                         | 8,362   |  |                                      |   | (671    | )             |  |   | 7,691   | 
|Land                                 |  |                         | 29,806  |  |                                      |   |        |               |  |   | 29,806  | 
|Land improvements                    |  |                         | 10,280  |  |                                      |   | (2,831  | )             |  |   | 7,449   | 
|Buildings                            |  |                         | 17,380  |  |                                      |   | (3,257  | )             |  |   | 14,123  | 
|Machinery and equipment              |  |                         | 153,560 |  |                                      |   | (37,297 | )             |  |   | 116,263 | 
|Furniture and fixtures               |  |                         | 599     |  |                                      |   | (67     | )             |  |   | 532     | 
|                                     |  |                         |         |  |                                      |   |         |               |  |   |         | 
|                                     |  |                         | 375,169 |  |                                      |   | (55,609 | )             |  |   | 319,560 | 
|Construction-in-progress             |  |                         | 17,228  |  |                                      |   |        |               |  |   | 17,228  | 
|                                     |  |                         |         |  |                                      |   |         |               |  |   |         | 
|                                     |  | $                       | 392,397 |  |                                      | $ | (55,609 | )             |  | $ | 336,788 | 
|                                     |  |                         |         |  |                                      |   |         |               |  |   |         | 

Depreciation, depletion and amortization expense, excluding accretion expense related to the asset retirement
obligation, recognized during the three months ended September 30, 2012 and 2011 was $5.8 million and $5.2 million, respectively, and $17.4 million and $15.2 million for the nine months ended September 30, 2012 and 2011, respectively.



11



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##### Table of Contents

U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



The amount of interest costs capitalized in property, plant and equipment was $308 and
$188 for the three months ended September 30, 2012 and 2011, respectively, and $541 and $342 for the nine months ended September 30, 2012 and 2011, respectively.

As of September 30, 2012, we hold no assets under a capital lease obligation.

NOTE HACCRUED LIABILITIES

At September 30, 2012 and December 31, 2011, accrued liabilities consisted of the following:



|                                                                      |  |                   |       |  |                  |   |       | 
|--------------------------------------------------------------------- |  | ----------------- | ----- |  | ---------------- | - | ----- | 
|                                                                      |  | September 30,2012 |       |  | December 31,2011 |  
|Accrued salaries and wages                                            |  | $                 | 2,029 |  |                  | $ | 2,215 | 
|Accrued vacation liability                                            |  |                   | 2,581 |  |                  |   | 2,669 | 
|Current portion of liability for pension and post-retirement benefits |  |                   | 1,695 |  |                  |   | 1,510 | 
|Accrued healthcare liability                                          |  |                   | 1,400 |  |                  |   | 1,155 | 
|Other accrued liabilities                                             |  |                   | 1,710 |  |                  |   | 2,326 | 
|                                                                      |  |                   |       |  |                  |   |       | 
|Total accrued liabilities                                             |  | $                 | 9,415 |  |                  | $ | 9,875 | 
|                                                                      |  |                   |       |  |                  |   |       | 

Other accrued liabilities consist of taxes payable, accrued rebates, accrued professional fees and other immaterial
items.

NOTE IDEBT

At September 30, 2012 and December 31, 2011, debt consisted of the following:



|                                                                                                                                                                                |  |                   |         |   |                  |   |         |  
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----------------- | ------- | - | ---------------- | - | ------- | -
|                                                                                                                                                                                |  | September 30,2012 |         |   | December 31,2011 |  
|Revolving line-of-credit: (expires October 31, 2015) (5.0% at September 30, 2012 and December 31,
2011)                                                                         |  | $                 |        |   |                  | $ |        |  
|Senior secured credit facility:                                                                                                                                                 |  |                   |         |   |                  |   |         |  
|Term loan facility (final maturity June 8, 2017) (4.75% at September 30, 2012 and December 31, 2011), net of
unamortized original issue discount of $717 and $843, respectively |  |                   | 256,032 |   |                  |   | 257,857 |  
|Short-term notes: (due December 14, 2012) (6.0% fixed)                                                                                                                          |  |                   | 3,932   |   |                  |   | 3,932   |  
|                                                                                                                                                                                |  |                   |         |   |                  |   |         |  
|Total debt                                                                                                                                                                      |  |                   | 259,964 |   |                  |   | 261,789 |  
|Less: current portion                                                                                                                                                           |  |                   | (6,364  | ) |                  |   | (6,364  | )
|                                                                                                                                                                                |  |                   |         |   |                  |   |         |  
|Total long-term portion of debt                                                                                                                                                 |  | $                 | 253,600 |   |                  | $ | 255,425 |  
|                                                                                                                                                                                |  |                   |         |   |                  |   |         |  

Revolving Line-of-Credit

As of September 30, 2012, the available borrowing base under our asset-based revolving line-of-credit (the Revolver) was $35.0 million, with nothing drawn as of that date and $10.0
million allocated for letters of credit and $1.2 million reserved for derivatives, leaving $23.8 million available for general corporate use under this revolving credit agreement.



12



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##### Table of Contents

U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



Debt Maturities

As of September 30, 2012, contractual maturities of our debt are as follows:



|           |  |   |         | 
|---------- |  | - | ------- | 
|2012       |  | $ | 4,540   | 
|2013       |  |   | 2,433   | 
|2014       |  |   | 2,435   | 
|2015       |  |   | 2,436   | 
|2016       |  |   | 124,648 | 
|Thereafter |  |   | 123,472 | 
|           |  |   |         | 
|           |  | $ | 259,964 | 
|           |  |   |         | 

On January 31, 2012, we amended our term loan facility (the Term Loan) and our Revolver. The primary
revisions to the Term Loan agreement were the elimination of a requirement to provide monthly financial reports, removal of financial covenant restrictions related to capital expenditures, provide flexibility to make investments and acquisitions and
to incur indebtedness, and to provide a new subsidiary guarantee from Coated Sand Solutions, LLC. The revisions to the Revolver were primarily to revise the definitions used for this agreement to wording similar to that used for the Term Loan
agreement.

The Term Loan is secured by substantially all of our assets with the exception of our accounts receivable and
inventory, for which we have pledged as collateral under the Revolver. As of September 30, 2012, we are in compliance with all covenants in accordance with our debt agreements.

NOTE JASSET RETIREMENT OBLIGATIONS

Mine reclamation costs, or future remediation costs for inactive mines, are accrued based on managements best
estimate at the end of each period of the costs expected to be incurred at a site. Such cost estimates include, where applicable, ongoing care, maintenance and monitoring costs. Changes in estimates at inactive mines are reflected in earnings in the
period an estimate is revised.

As of September 30, 2012 and December 31, 2011, we had recorded a liability of $10.0
million and $9.5 million in other long-term obligations related to our asset retirement obligation. Changes in the asset retirement obligation during the nine month period ended September 30, 2012 and the year ended December 31, 2011 are
as follows:



|                                                  |  |                   |       |  |                     |   |       | 
|------------------------------------------------- |  | ----------------- | ----- |  | ------------------- | - | ----- | 
|                                                  |  | September 30,2012 |       |  | December 31,2011(1) |  
|Beginning balance                                 |  | $                 | 9,504 |  |                     | $ | 6,401 | 
|Liabilities settled/payments                      |  |                   |      |  |                     |   |      | 
|Accretion expense                                 |  |                   | 493   |  |                     |   | 537   | 
|Additions, revisions of prior estimates and other |  |                   |      |  |                     |   | 2,566 | 
|                                                  |  |                   |       |  |                     |   |       | 
|Ending balance                                    |  | $                 | 9,997 |  |                     | $ | 9,504 | 
|                                                  |  |                   |       |  |                     |   |       | 



|(1) | Represents change in the asset retirement obligation during the 12-month period ended December 31, 2011.
|--- | --------------------------------------------------------------------------------------------------------

NOTE KFAIR VALUE ACCOUNTING

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an
exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.

Cash equivalents

Due to the short-term maturity, we believe that our cash
equivalent instruments at September 30, 2012 and December 31, 2011 approximate their reported carrying values.

Long-Term Debt,
including current maturities

We believe that the fair values of our long-term debt, including current maturities,
approximates their carrying values and based on their effective interest rates compared to current market rates.



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##### Table of Contents

U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



Derivative Instruments

The estimated fair value of our derivative assets (interest rate caps) are recorded at each reporting period and are based upon widely accepted valuation techniques, including discounted cash flow
analysis on the expected cash flows of each derivative contract. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied
volatilities. We also incorporate credit valuation adjustments to appropriately reflect both our nonperformance risk as well as that of the respective counterparty in the fair value measurements.

Although we have determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value
hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by us and our counterparties. However, as of September 30,
2012, we have assessed that the impact of the credit valuation adjustments on the overall valuation of our derivative positions is not significant. As a result, we have determined that our derivative valuations in their entirety are classified in
Level 2 of the fair value hierarchy.

In accordance with the fair value hierarchy, the following table presents the fair value
as of September 30, 2012, of those derivative assets that we must measure at fair value on a recurring basis:



|                          |  |         |   |  |         |   |   |         |  |   |       |  |  |   |   | 
|------------------------- |  | ------- | - |  | ------- | - | - | ------- |  | - | ----- |  |  | - | - | 
|                          |  | Level 1 |   |  | Level 2 |   |   | Level 3 |  |   | Total | 
|Interest rate derivatives |  | $       |  |  |         | $ |  |         |  | $ |      |  |  | $ |  | 
|                          |  |         |   |  |         |   |   |         |  |   |       |  |  |   |   | 
|Net asset                 |  | $       |  |  |         | $ |  |         |  | $ |      |  |  | $ |  | 
|                          |  |         |   |  |         |   |   |         |  |   |       |  |  |   |   | 

NOTE LDERIVATIVE INSTRUMENTS

We are exposed to certain risks arising from both our business operations and economic conditions. We principally
manage our exposure to a wide variety of business and operation risks through management of our core business activities. Specifically, we enter into derivative financial instruments to manage exposures that arise from business activities that
result in the receipt or payment of future known and unknown cash amounts, the value of which are determined by current interest rates. Interest rate derivatives are utilized in the normal course of business to manage our interest cost and the risk
associated with changing interest rates. We do not use derivative financial instruments for trading or speculative purposes. By their nature, all such instruments involve risk, including the possibility that a loss may occur from the failure of
another party to perform according to the terms of a contract (credit risk) or the possibility that future changes in market price may make a financial instrument less valuable or more onerous (market risk). As is customary for these types of
instruments, we do not require collateral or other security from other parties to these instruments. In managements opinion, there is no significant risk of loss in the event of nonperformance of the counterparties to these financial
instruments.

Cash Flow Hedges of Interest Rate Risk

Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish this objective, we primarily use interest
rate cap agreements as part of our interest rate risk management strategy. Interest rate caps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty if interest rates rise above the strike rate on the
contract in exchange for an upfront premium.

In connection with the Term Loan, we have entered into two interest rate cap
agreements that effectively place an upper limit for one-month LIBOR at 4.0 percent on the interest rate charged for $130.0 million of our floating rate Term Loan. On March 31, 2012, one of the agreements with a notional amount of $100.0
million matured. Concurrently with the maturity, the notional amount of a second agreement with an original notional amount of $30.0 million automatically increased to $130.0 million per the terms of the contract. No additional expense was
reclassified from accumulated other comprehensive income or recognized directly in earnings as a result of the maturity or adjustment.

We assess the effectiveness of our hedges in offsetting the variability in the cash flow of the hedged obligations on a quarterly basis. The effective portion of changes in the fair value of derivatives
designated and that qualify as cash flow hedges is recorded in equity as accumulated other comprehensive income and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. The ineffective
portion of the change in fair value of the derivatives is recognized directly in earnings. During the nine months ended September 30, 2012 and December 31, 2011, the Company had no ineffectiveness for such contracts.



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##### Table of Contents

U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



The following table summarizes the fair value of our derivative instruments. See Note K
for additional disclosures regarding the estimated fair values of our derivative instruments at September 30, 2012 and December 31, 2011.



|                               |  |              |  |                         |  |                |                   |  |           |   |   |                         |  |   |                |  |  |           |    |  |  |   |    | 
|------------------------------ |  | ------------ |  | ----------------------- |  | -------------- | ----------------- |  | --------- | - | - | ----------------------- |  | - | -------------- |  |  | --------- | -- |  |  | - | -- | 
|                               |  |              |  | September 30, 2012      |  |                | December 31, 2011 | 
|                               |  | MaturityDate |  | Contract/NotionalAmount |  | CarryingAmount |                   |  | FairValue |   |   | Contract/NotionalAmount |  |   | CarryingAmount |  |  | FairValue |   
|Interest rate cap agreement(1) |  | 2012         |  |                         |  |                |                   |  |           |   |   |                         |  | $ | 100 million    |  |  | $         |   |  |  | $ |   | 
|Interest rate cap agreement(1) |  | 2013         |  | $130 million            |  | $              |                  |  |           | $ |  |                         |  | $ | 30 million     |  |  | $         | 11 |  |  | $ | 11 | 



|(1) | Agreements limit the LIBOR floating interest rate base to 4%.
|--- | -------------------------------------------------------------

We have designated these contracts as qualified cash flow hedges. Accordingly, the effective portion of the gain or loss
on the derivative instrument is reported as a component of other comprehensive income and recognized in earnings in the same period or periods during which the hedged transaction affects earnings.

The following table summarizes the effect of our derivatives instruments on our income statements and our condensed consolidated
statements of comprehensive income for the three and nine months ended September 30, 2012 and 2011.



|                                                             |  |                                  |      |   |                                 |   |      |      |  |   |      |   |  |   |      |  
|------------------------------------------------------------ |  | -------------------------------- | ---- | - | ------------------------------- | - | ---- | ---- |  | - | ---- | - |  | - | ---- | -
|                                                             |  | Three Months 
EndedSeptember 30, |      |   | Nine Months 
EndedSeptember 30, |  
|                                                             |  | 2012                             |      |   | 2011                            |   |      | 2012 |  |   | 2011 |  
|Deferred losses from derivatives in OCI, beginning of period |  | $                                | (248 | ) |                                 | $ | (458 | )    |  | $ | (409 | ) |  | $ | (532 | )
|Gain (loss) recognized in OCI from derivative instruments    |  |                                  |     |   |                                 |   | (72  | )    |  |   | (11  | ) |  |   | (229 | )
|Gain (loss) reclassified from Accumulated OCI into income    |  |                                  | 2    |   |                                 |   | (4   | )    |  |   | 174  |   |  |   | 227  |  
|                                                             |  |                                  |      |   |                                 |   |      |      |  |   |      |   |  |   |      |  
|Deferred losses from derivatives in OCI, end of period       |  | $                                | (246 | ) |                                 | $ | (534 | )    |  | $ | (246 | ) |  | $ | (534 | )
|                                                             |  |                                  |      |   |                                 |   |      |      |  |   |      |   |  |   |      |  

NOTE MEQUITY-BASED COMPENSATION

We recognize the cost of employee services rendered in exchange for awards of equity instruments, such as stock
options and restricted stock, based on the fair value of those awards at the date of the grant. Compensation expense for equity units is recognized, on a straight-line basis, net of forfeitures, over the requisite service period for the fair value
of the awards that actually vest.

As of September 30, 2012, we maintain two equity incentive plans (i) the GGC USS
Holdings, LLC Management Equity Program (the Equity Program), and (ii) the U.S. Silica Holdings, Inc. 2011 Incentive Compensation Plan (the 2011 Plan). The Equity Program granted Class C and Class D member units in the
parent company, GGC USS Holdings, LLC, to three members of executive management; two of which continue to be employed by the Company at September 30, 2012. The 2011 Plan provides for grants of stock options, stock appreciation rights,
restricted stock and other incentive-based awards.

For awards granted under the Equity Program, we recognized $55 of
compensation expense during each of the three months ended September 30, 2012 and 2011, and $164 and $205 during the nine months ended September 30, 2012 and 2011, respectively. As of September 30, 2012, there was $354 of total
unrecognized compensation expense related to equity incentive shares, which is expected to be recognized over a weighted-average period of approximately 1.75 years.

For awards granted under the 2011 Plan, we recognized $459 and $1,498 of compensation expense during the three and nine months ended September 30, 2012, respectively, and $477 of compensation expense
during the three and nine months ended September 30, 2011. As of September 30, 2012, there was $5.1 million of total unrecognized compensation expense related to equity incentive awards, which is expected to be recognized over a
weighted-average period of approximately 2.93 years.



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U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



NOTE NLEASES

We are obligated under certain operating leases and rental agreements for railroad cars, office space, mining property,
mining/processing equipment and transportation and other equipment. Future minimum annual commitments under such operating leases at September 30, 2012 are as follows:



|                               |  |   |        | 
|------------------------------ |  | - | ------ | 
|2012                           |  | $ | 10,548 | 
|2013                           |  |   | 10,182 | 
|2014                           |  |   | 7,469  | 
|2015                           |  |   | 6,774  | 
|2016                           |  |   | 5,356  | 
|Thereafter                     |  |   | 9,212  | 
|                               |  |   |        | 
|Total future lease commitments |  | $ | 49,541 | 
|                               |  |   |        | 

Expense related to operating leases and rental agreements was $3.2 million and $1.7 million for the three months ended
September 30, 2012 and 2011, respectively, and $8.7 million and $4.9 million for the nine months ended September 30, 2012 and 2011, respectively.

NOTE OCOMMITMENTS AND CONTINGENCIES

Our operating subsidiary, U.S. Silica, has been named as a defendant in various product liability claims alleging
damages caused by silica exposure. Almost all of the claims pending against us arise out of alleged use of our silica products in foundries or as an abrasive blast media, and involve various other defendants. Prior to 1986, U.S. Silica had numerous
insurance policies and an indemnity from a former owner that cover silicosis claims. Some of those coverages are currently being litigated, however we believe the policies and indemnity will remain in force. During the nine months ended
September 30, 2012, one new claim has been brought against us. As of September 30, 2012, there were 103 active silica-related products liability claims pending in which U.S. Silica is a defendant. Although the outcomes of these claims
cannot be predicted with certainty, in the opinion of management, the ultimate resolution of these matters will not have a material adverse effect on our financial position or results of operations.

We have recorded estimated liabilities for these claims in other long-term obligations as well as estimated recoveries under the
indemnity agreement and an estimate of future recoveries under insurance in other assets on our combined balance sheets. As of September 30, 2012 and December 31, 2011, other noncurrent assets included $319 and $511, respectively, for
insurance for third-party products liability claims and other long-term obligations included $1.1 million and $1.5 million, respectively, in third-party products claims liability.

NOTE PINCOME TAXES

We evaluate our deferred tax assets periodically to determine if valuation allowances are required. Ultimately, the
realization of deferred tax assets is dependent upon generation of future taxable income during those periods in which temporary differences become deductible and/or credits can be utilized. To this end, management considers the level of historical
taxable income, the scheduled reversal of deferred tax liabilities, tax-planning strategies and projected future taxable income. Based on these considerations, and the carry-forward availability of a portion of the deferred tax assets, management
believes it is more likely than not that we will realize the benefit of the deferred tax assets.

At the end of each reporting
period as presented, there were no material amounts of interest and penalties recognized in the statement of operations or balance sheets. We have no material unrecognized tax benefits or any known material tax contingencies at September 30,
2012 and December 31, 2011. Tax returns filed with the IRS for the years 2009 through 2011 along with tax returns filed with numerous state entities remain subject to examination.

In accordance with generally accepted accounting principles, it is our practice at the end of each interim reporting period to make our
best estimate of the effective tax rate expected to be applicable for the full fiscal year. Estimates are revised as additional information becomes available.

The largest permanent item in computing both our effective tax rate and taxable income is the deduction allowed for statutory depletion. The deduction for statutory depletion does not necessarily change
proportionately to changes in income before income taxes.



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U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



NOTE QPENSION AND POST-RETIREMENT BENEFITS

The Company maintains a noncontributory defined benefit pension plan covering certain employees. Net periodic pension
benefit cost recognized for the three and nine months ended September 30, 2012 and 2011, are as follows:



|                                   |  |                                  |        |   |                                 |   |        |      |  |   |        |   |  |   |        |  
|---------------------------------- |  | -------------------------------- | ------ | - | ------------------------------- | - | ------ | ---- |  | - | ------ | - |  | - | ------ | -
|                                   |  | Three Months 
EndedSeptember 30, |        |   | Nine Months 
EndedSeptember 30, |  
|                                   |  | 2012                             |        |   | 2011                            |   |        | 2012 |  |   | 2011   |  
|Service cost                       |  | $                                | (280   | ) |                                 | $ | (287   | )    |  | $ | (839   | ) |  | $ | (770   | )
|Interest cost                      |  |                                  | (1,183 | ) |                                 |   | (1,189 | )    |  |   | (3,550 | ) |  |   | (2,927 | )
|Expected return on plan assets     |  |                                  | 1,345  |   |                                 |   | 1,204  |      |  |   | 4,036  |   |  |   | 2,883  |  
|Amortization of prior service cost |  |                                  | (6     | ) |                                 |   | 3      |      |  |   | (20    | ) |  |   | 22     |  
|Amortization of net (gain) loss    |  |                                  | (270   | ) |                                 |   | (151   | )    |  |   | (809   | ) |  |   | (467   | )
|                                   |  |                                  |        |   |                                 |   |        |      |  |   |        |   |  |   |        |  
|Net periodic benefit cost          |  | $                                | (394   | ) |                                 | $ | (420   | )    |  | $ | (1,182 | ) |  | $ | (1,259 | )
|                                   |  |                                  |        |   |                                 |   |        |      |  |   |        |   |  |   |        |  

In addition, the Company provides defined benefit post-retirement healthcare and life insurance benefits to some
employees. Net periodic post-retirement benefit cost recognized for the three and nine months ended September 30, 2012 and 2011 are as follows:



|                                |  |                                  |      |   |                                 |   |      |      |  |   |        |   |  |   |        |  
|------------------------------- |  | -------------------------------- | ---- | - | ------------------------------- | - | ---- | ---- |  | - | ------ | - |  | - | ------ | -
|                                |  | Three Months 
EndedSeptember 30, |      |   | Nine Months 
EndedSeptember 30, |  
|                                |  | 2012                             |      |   | 2011                            |   |      | 2012 |  |   | 2011   |  
|Service cost                    |  | $                                | (33  | ) |                                 | $ | (32  | )    |  | $ | (149   | ) |  | $ | (130   | )
|Interest cost                   |  |                                  | (192 | ) |                                 |   | (197 | )    |  |   | (785   | ) |  |   | (792   | )
|Expected return on plan assets  |  |                                  | 1    |   |                                 |   | 1    |      |  |   | 3      |   |  |   | 3      |  
|Amortization of net (gain) loss |  |                                  | (29  | ) |                                 |   |     |      |  |   | (219   | ) |  |   | (87    | )
|                                |  |                                  |      |   |                                 |   |      |      |  |   |        |   |  |   |        |  
|Net periodic benefit cost       |  | $                                | (253 | ) |                                 | $ | (228 | )    |  | $ | (1,150 | ) |  | $ | (1,006 | )
|                                |  |                                  |      |   |                                 |   |      |      |  |   |        |   |  |   |        |  

We contributed $1.7 million and $4.8 million to the qualified pension plan during the three and nine months ended
September 30, 2012, respectively, and $2.1 million and $11.0 million during the three and nine months ended September 30, 2011, respectively. Total expected employer funding contributions during the fiscal year ending December 31,
2012 are $4.8 million for the pension plan, and $1.4 million for the post-retirement medical and life plan.

NOTE ROBLIGATIONS UNDER GUARANTEES

We have indemnified St. Paul Travelers (Travelers) against any loss Travelers may incur in the event that
holders of surety bonds, issued on our behalf by Travelers, execute the bonds. As of September 30, 2012, Travelers had $4.6 million in bonds outstanding for us. The majority of these bonds ($4.4 million) relate to reclamation requirements
issued by various governmental authorities. Reclamation bonds remain outstanding until the mining area is reclaimed and the authority issues a formal release. The remaining bonds relate to such indefinite purposes as licenses, permits, and tax
collection.

We have indemnified Safeco Insurance Company of America (Safeco) against any loss Safeco may incur in
the event that holders of surety bonds, issued on our behalf by Safeco, execute the bonds. As of September 30, 2012, Safeco had $513 in bonds outstanding for us. These are all reclamation bonds.

U.S. Silica is the contingent guarantor of Kanawha Rail Corporations (KRC) obligations as lessee of 200 covered hopper
railroad cars, which are used by U.S. Silica to ship sand to its customers. KRCs obligation as lessee includes paying monthly rent of $66 until June 30, 2013, maintaining the cars, paying for any cars damaged or destroyed, and
indemnifying all other parties to the lease transaction against liabilities including any loss of certain tax benefits. By separate agreement between U.S. Silica and KRC, KRC may, upon the occurrence of certain events, assign the lease obligations
to U.S. Silica, but none of these events have occurred.

NOTE SRELATED PARTY TRANSACTIONS

Advisory Agreement

In connection with our acquisition by an affiliate of Golden Gate Capital (the Golden Gate Capital Acquisition), we entered into an Advisory Agreement with Golden Gate Capital (the
Advisory Agreement) whereby Golden Gate Capital



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U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



agreed to provide business and organizational strategy and financial and advisory services. Such services included support and assistance to management with respect to negotiating and analyzing
acquisitions and divestitures, negotiating and analyzing financing alternatives, preparing financial projections, monitoring compliance with financing agreements, marketing functions and searching for and hiring management personnel.

As compensation for these services, we agreed to pay Golden Gate Capital (1) an annual advisory fee in the aggregate amount equal to
$1.3 million, payable quarterly in arrears, and (2) a transaction fee of 1.25% of the aggregate value of each transaction resulting in a change in control of our parent LLC or its subsidiaries, along with each acquisition, divestiture,
recapitalization and financing. In addition to the fees described above, we also reimbursed Golden Gate Capital for all out-of-pocket costs incurred by Golden Gate Capital in connection with its activities under the Advisory Agreement, and
indemnified Golden Gate Capital from and against all losses, claims, damages and liabilities related to the performance of its duties under the Advisory Agreement.

On February 6, 2012, we paid $8.0 million to Golden Gate Capital to terminate the advisory agreement previously entered into in connection with the Golden Gate Capital Acquisition. The $8.0 million
termination fee was accrued for at December 31, 2011 and no additional expense has been recognized during the nine months ended September 30, 2012. Advisory fees paid to Golden Gate Capital during the three and nine months ended
September 30, 2011 totaled $0.3 million and $0.9 million, respectively. These expenses are included in other operating expenses and presented as advisory fees to parent within our income statements.

Promissory Note

On
December 22, 2010, GGC RCS Holdings, Inc., entered into a $15.0 million promissory note with GGC USS Holdings, LLC, our parent and then sole stockholder prior to the IPO and now largest stockholder. The note provided working capital for a new
subsidiary and matures on December 22, 2015. The note bore interest at 10%. Outstanding principal and interest under the note was payable upon demand, but no later than the maturity date. Upon sole election by the parent, any unpaid interest
could be paid in cash on December 22 of each year until the maturity date. Interest on the note was recorded in interest expense in the Income Statements and any unpaid interest was included in accrued interest on the Balance Sheets. On
January 31, 2012, simultaneously with the IPO, GGC USS Holdings, LLC contributed to us all of the stock of GGC RCS Holdings, Inc. and converted the $15.0 million promissory note, including $1.7 million of accrued interest, to equity.

NOTE TSEGMENT REPORTING

Our business is organized into two reportable segments, Oil & Gas Proppants and Industrial & Specialty
Products, based on end markets. The reportable segments are consistent with how management views the markets that we serve and the financial information reviewed by the chief operating decision maker. We manage our Oil & Gas Proppants and
Industrial & Specialty Products businesses as components of an enterprise for which separate information is available and is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess
performance.

An operating segments performance is primarily evaluated based on segment contribution margin, which
excludes certain corporate costs not associated with the operations of the segment. These corporate costs are separately stated below and include costs that are related to functional areas such as operations management, corporate purchasing,
accounting, treasury, information technology, legal and human resources. We believe that segment contribution margin, as defined above, is an appropriate measure for evaluating the operating performance of our segments. However, this measure should
be considered in addition to, not a substitute for, or superior to, income from operations or other measures of financial performance prepared in accordance with generally accepted accounting principles. The other accounting policies of each of the
two reporting segments are the same as those in the summary of significant accounting policies included in Note B.

In the
Oil & Gas Proppants segment, we serve the oil and gas recovery market providing fracturing sand, or frac sand, which is pumped down oil and natural gas wells to prop open rock fissures and increase the flow rate of natural gas
and oil from the wells.

The Industrial & Specialty Products segment consists of over 200 products and materials used
in a variety of industries including, container glass, fiberglass, specialty glass, flat glass, building products, fillers and extenders, foundry products, chemicals, recreation products and filtration products.



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U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited; dollars in thousands, except share and per share amounts)



The following table presents sales and segment contribution margin for the reporting
segments and other operating results not allocated to the reported segments for the three and nine months ended September 30, 2012 and 2011:



|                                                              |  |                                 |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|------------------------------------------------------------- |  | ------------------------------- | ------- | - | ------------------------------ | - | ------ | ---- |  | - | ------- | - |  | - | ------- | -
|                                                              |  | Three Months
EndedSeptember 30, |         |   | Nine Months
EndedSeptember 30, |  
|                                                              |  | 2012                            |         |   | 2011                           |   |        | 2012 |  |   | 2011    |  
|Sales:                                                        |  |                                 |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Oil and Gas Proppants                                         |  | $                               | 64,538  |   |                                | $ | 24,246 |      |  | $ | 172,845 |   |  | $ | 69,322  |  
|Industrial and Specialty Products                             |  |                                 | 51,347  |   |                                |   | 49,207 |      |  |   | 150,230 |   |  |   | 142,643 |  
|                                                              |  |                                 |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Total sales                                                   |  |                                 | 115,885 |   |                                |   | 73,453 |      |  |   | 323,075 |   |  |   | 211,965 |  
|Segment contribution margin:                                  |  |                                 |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Oil and Gas Proppants                                         |  |                                 | 34,236  |   |                                |   | 15,633 |      |  |   | 102,563 |   |  |   | 43,828  |  
|Industrial and Specialty Products                             |  |                                 | 14,184  |   |                                |   | 13,730 |      |  |   | 40,568  |   |  |   | 38,495  |  
|                                                              |  |                                 |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Total segment contribution margin                             |  |                                 | 48,420  |   |                                |   | 29,363 |      |  |   | 143,131 |   |  |   | 82,323  |  
|Operating activities excluded from segment
cost of goods sold |  |                                 | (2,241  | ) |                                |   | (1,151 | )    |  |   | (5,603  | ) |  |   | (1,503  | )
|Selling, general and administrative                           |  |                                 | (10,135 | ) |                                |   | (5,215 | )    |  |   | (29,757 | ) |  |   | (16,491 | )
|Advisory fee to parent                                        |  |                                 |        |   |                                |   | (313   | )    |  |   |        |   |  |   | (938    | )
|Early extinguishment of debt                                  |  |                                 |        |   |                                |   |       |      |  |   |        |   |  |   | (6,043  | )
|Depreciation, depletion and amortization                      |  |                                 | (5,968  | ) |                                |   | (5,295 | )    |  |   | (17,920 | ) |  |   | (15,636 | )
|Interest expense                                              |  |                                 | (3,326  | ) |                                |   | (3,832 | )    |  |   | (10,551 | ) |  |   | (14,505 | )
|Other income, net, including interest income                  |  |                                 | 348     |   |                                |   | 197    |      |  |   | 681     |   |  |   | 534     |  
|                                                              |  |                                 |         |   |                                |   |        |      |  |   |         |   |  |   |         |  
|Income before income taxes                                    |  | $                               | 27,098  |   |                                | $ | 13,754 |      |  | $ | 79,981  |   |  | $ | 27,741  |  
|                                                              |  |                                 |         |   |                                |   |        |      |  |   |         |   |  |   |         |  

Asset information, including capital expenditures and depreciation, depletion, and amortization, by segment is not
included in reports used by management in its monitoring of performance and, therefore, is not reported by segment. As of September 30, 2012 and December 31, 2011, goodwill of $68.4 million has been allocated to these segments with $33.3
million assigned to Oil & Gas Proppants and $35.1 million to Industrial and Specialty Products.



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##### Table of Contents

|ITEM 2. | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
|------- | -------------------------------------------------------------------------------------

The following discussion and analysis of our financial condition and results of operations should be read together with the Condensed
Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q and the related notes included elsewhere in this report.

Managements discussion and analysis of financial condition and results of operations (MD&A), is organized into the following sections:



| |  |  | Overview  A general description of our business, our strategic initiatives and the commercial silica industry.
| | - |  | ---------------------------------------------------------------------------------------------------------------



| |  |  | Results of Operations  An analysis of our consolidated and combined results of operations for the interim periods presented in our
Condensed Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Liquidity and Capital Resources  An analysis of our cash flows, sources and uses of cash, contractual obligations and other items that may
impact our financial position.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Critical Accounting Estimates  A discussion of accounting policies that require critical judgments and estimates.
| | - |  | ------------------------------------------------------------------------------------------------------------------



| |  |  | Recent Accounting Pronouncements  A summary of accounting pronouncements which have been issued by relevant accounting standards.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------

In addition to disclosing financial results that are determined in accordance with United States generally
accepted accounting principles, or GAAP, we also use certain non-GAAP financial information, such as:



| |  |  | Segment contribution margin, and
| | - |  | --------------------------------



| |  |  | Net income (loss) adjusted to remove interest, taxes, depreciation, amortization, impairment, and other special items in order to arrive at Adjusted
EBITDA as defined in our term loan facility.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Segment contribution margin and Adjusted EBITDA are not
recognized measures under GAAP and should not be considered alternatives to or superior to expense and profitability measures derived in accordance with GAAP. For a detailed description of the non-GAAP measures used in this MD&A, please see the
discussion under How We Evaluate Our Business on page 25 and Non-GAAP Financial Performance Measures beginning on page 32.

Forward-Looking Statements

This Quarterly Report on Form 10-Q contains
forward-looking statements that are subject to risks and uncertainties. All statements other than statements of historical fact included in this Quarterly Report on Form 10-Q are forward-looking statements. Forward-looking statements give our
current expectations and projections relating to our financial condition, results of operations, plans, objectives, future performance and business. You can identify forward-looking statements by the fact that they do not relate strictly to
historical or current facts. These statements may include words such as anticipate, estimate, expect, project, plan, intend, believe, may,
will, should, can have, likely and other words and terms of similar meaning in connection with any discussion of the timing or nature of future operating or financial performance or other events. For
example, all statements we make relating to our estimated and projected costs, expenditures, cash flows, growth rates and financial results, our plans and objectives for future operations, growth or initiatives, strategies or the expected outcome or
impact of pending or threatened litigation are forward-looking statements. All forward-looking statements are subject to risks and uncertainties that may cause actual results to differ materially from those that we expected, including:



| |  |  | fluctuations in demand for commercial silica;
| | - |  | ---------------------------------------------



| |  |  | the cyclical nature of our customers businesses;
| | - |  | -------------------------------------------------



| |  |  | operating risks that are beyond our control, such as changes in the price and availability of transportation, natural gas or electricity; unusual or
unexpected geological formations or pressures; cave-ins, pit wall failures or rock falls; or unanticipated ground, grade or water conditions;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our dependence on two of our plants for a significant portion of our sales;
| | - |  | ---------------------------------------------------------------------------



| |  |  | the level of activity in the natural gas and oil industries;
| | - |  | ------------------------------------------------------------



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##### Table of Contents

| |  |  | decreased demand for frac sand or the development of either effective alternative proppants or new processes to replace hydraulic fracturing;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | federal, state and local legislative and regulatory initiatives relating to hydraulic fracturing and the potential for related regulatory action or
litigation affecting our customers operations;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our rights and ability to mine our properties and our renewal or receipt of the required permits and approvals from governmental authorities and other
third parties;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to implement our capacity expansion plans within our current timetable and budget and our ability to secure off-take agreements for our
increased production capacity, and the actual operating costs once we have completed the capacity expansion;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to succeed in competitive markets;
| | - |  | ----------------------------------------------



| |  |  | loss of, or reduction in, business from our largest customers;
| | - |  | --------------------------------------------------------------



| |  |  | increasing costs or a lack of dependability or availability of transportation services or infrastructure;
| | - |  | ---------------------------------------------------------------------------------------------------------



| |  |  | increases in the prices of, or interruptions in the supply of, natural gas and electricity, or any other energy sources;
| | - |  | ------------------------------------------------------------------------------------------------------------------------



| |  |  | increases in the price of diesel fuel;
| | - |  | --------------------------------------



| |  |  | diminished access to water;
| | - |  | ---------------------------



| |  |  | our ability to effectively integrate the manufacture of resin-coated sand with our existing processes;
| | - |  | ------------------------------------------------------------------------------------------------------



| |  |  | our ability to successfully complete acquisitions or integrate acquired businesses;
| | - |  | -----------------------------------------------------------------------------------



| |  |  | our ability to make capital expenditures to maintain, develop and increase our asset base and our ability to obtain needed capital or financing on
satisfactory terms;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to repurchase some or all of our shares we anticipate purchasing pursuant to our repurchase program;
| | - |  | ----------------------------------------------------------------------------------------------------------------



| |  |  | substantial indebtedness and pension obligations;
| | - |  | -------------------------------------------------



| |  |  | restrictions imposed by our indebtedness on our current and future operations;
| | - |  | ------------------------------------------------------------------------------



| |  |  | the accuracy of our estimates of mineral reserves and resource deposits;
| | - |  | ------------------------------------------------------------------------



| |  |  | substantial costs of mine closures;
| | - |  | -----------------------------------



| |  |  | a shortage of skilled labor and rising costs in the mining industry;
| | - |  | --------------------------------------------------------------------



| |  |  | our ability to attract and retain key personnel;
| | - |  | ------------------------------------------------



| |  |  | our ability to maintain satisfactory labor relations;
| | - |  | -----------------------------------------------------



| |  |  | our reliance on trade secrets and contractual restrictions, rather than patents, to protect our proprietary rights;
| | - |  | -------------------------------------------------------------------------------------------------------------------



| |  |  | silica-related health issues and corresponding litigation;
| | - |  | ----------------------------------------------------------



| |  |  | our significant unfunded pension obligations and post-retirement health care liabilities;
| | - |  | -----------------------------------------------------------------------------------------



| |  |  | our ability to maintain effective quality control systems at our mining, processing and production facilities;
| | - |  | --------------------------------------------------------------------------------------------------------------



| |  |  | seasonal and severe weather conditions;
| | - |  | ---------------------------------------



| |  |  | fluctuations in our sales and results of operations due to seasonality and other factors;
| | - |  | -----------------------------------------------------------------------------------------



| |  |  | interruptions or failures in our information technology systems;
| | - |  | ----------------------------------------------------------------



| |  |  | the impact of a terrorist attack or armed conflict;
| | - |  | ---------------------------------------------------



| |  |  | our failure to maintain adequate internal controls;
| | - |  | ---------------------------------------------------



| |  |  | extensive and evolving environmental, mining, health and safety, licensing, reclamation and other regulation (and changes in their enforcement or
interpretation);
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------



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##### Table of Contents

| |  |  | our ability to acquire, maintain or renew financial assurances related to the reclamation and restoration of mining property; and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------



| |  |  | other factors included and disclosed in Part I, Item 1A, Risk Factors of our 2011 Annual Report.
| | - |  | --------------------------------------------------------------------------------------------------

We derive many of our forward-looking statements from our operating budgets and forecasts, which are based on many detailed assumptions.
While we believe that our assumptions are reasonable, we caution that it is very difficult to predict the impact of known factors, and it is impossible for us to anticipate all factors that could affect our actual results. Important factors that
could cause actual results to differ materially from our expectations, or cautionary statements, are disclosed under Item 1A, Risk Factors and Item 7, Managements Discussion and Analysis of Financial Condition and
Results of Operations in our 2011 Annual Report. All written and oral forward-looking statements attributable to us, or persons acting on our behalf, are expressly qualified in their entirety by these cautionary statements as well as other
cautionary statements that are made from time to time in our other filings with the SEC, including this Quarterly Report on Form 10-Q, and public communications. You should evaluate all forward-looking statements made in this Quarterly Report on
Form 10-Q in the context of these risks and uncertainties.

We caution you that the important factors referenced above may not
contain all of the factors that are important to you. In addition, we cannot assure you that we will realize the results or developments we expect or anticipate or, even if substantially realized, that they will result in the consequences or affect
us or our operations in the way we expect. The forward-looking statements included in this Quarterly Report on Form 10-Q are made only as of the date hereof. We undertake no obligation to update or revise any forward-looking statement as a result of
new information, future events or otherwise, except as otherwise required by law.

Overview

We are the second largest domestic producer of commercial silica, a specialized mineral that is a critical input into a variety of
attractive end markets. During our 112-year history, we have developed core competencies in mining, processing, logistics and materials science that enable us to produce and cost-effectively deliver products to customers across these markets. In our
largest end market, Oil and Gas Proppants, our frac sand is used to stimulate and maintain the flow of hydrocarbons in oil and natural gas wells. This segment of our business has experienced rapid growth due to recent technological advances in the
hydraulic fracturing process, which have made the extraction of large volumes of oil and natural gas from U.S. shale formations economically feasible. Our silica is also used as an economically irreplaceable raw material in a wide range of
industrial applications, including glassmaking and chemical manufacturing. Additionally, in recent years a number of attractive new end markets have developed for our high-margin, performance silica products, including solar panels, specialty
coatings, wind turbines, polymer additives and geothermal energy systems.

We operate 13 facilities across the United States
and control 312 million tons of reserves. We own one of the largest frac sand processing plants in the United States and control approximately 145 million tons of reserves that can be processed to meet American Petroleum Institute (API) frac sand
size specifications. Our operations are organized into two segments based on end markets served: (1) Oil & Gas Proppants and (2) Industrial & Specialty Products. Our segments are complementary because our ability to sell
to a wide range of customers across end markets allows us to maximize recovery rates in our mining operations, optimize our asset utilization and reduce the cyclicality of our earnings.

Recent Trends and Outlook

From 1980 to 2008, U.S. commercial silica
industry volumes generally grew in line with U.S industrial production, primarily influenced by the manufacture of glass, building materials, foundry moldings and chemicals. Beginning in 2004, demand for Oil and Gas Proppants supplemented growth in
Industrial and Specialty Products end markets. The economic downturn of 2008 and 2009 decreased demand for commercial silica products, particularly in the glassmaking, foundry, building products, chemicals and fillers and extenders end markets. With
the recent economic recovery, however, we estimate overall demand for commercial silica grew in excess of 45%, to approximately 39.0 million tons in 2010. Trends continuing to drive overall demand for commercial silica include:



| |  |  | Increased demand in the Oil and Gas Proppants end market.The increased demand for frac sand has historically been driven by the growth in the
use of hydraulic fracturing as a means to extract hydrocarbons from oil and gas bearing formations. Since 2002, the average annual growth rate in the North American horizontal rig count has approached 40% per annum. Based on independent third
party market data and our internal estimates, we believe frac sand demand has grown 35% in average over the last five years with hydraulic operations in the U.S. using about 17.0 million tons of sand in 2010 and 28.7 million tons of sand
in 2011. We believe this historical growth will continue at a deliberate pace over the mid-to-long term as demand for these hydrocarbons will continue to drive production volumes. Furthermore, the growth in demand will also continue to be driven as
a result of improved drill rig productivity that is allowing wells to be drilled faster,
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| | increases in the number of stages, or density, and increases in the length of the lateral wells. According to The Freedonia Group Inc., based on these factors demand for all proppants is
projected to increase approximately 15% per annum, on average through 2015.
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Continued resurgence of demand in industrial end markets and continued growth in specialty end markets. The economic downturn resulting from the
financial crisis negatively impacted demand for our products in Industrial and Specialty Products end markets, most notably in the glassmaking, building products, foundry and chemicals end markets. This drop coincided with a similar drop in key
economic demand drivers, including housing starts, light vehicle sales, repair and remodel activity and industrial production. To the extent these demand drivers recover to historical levels (which is difficult to predict given current economic
uncertainty), we expect to see a corresponding increase in the demand for our commercial silica. In addition, to the extent commercial silica products continue to be used in key alternative energy markets, we anticipate continued volume growth in
specialty end markets such as solar panels and geothermal energy systems as well as increased use of commercial silica in new applications, such as specialty coatings and polymer additives.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Continued increases in prices of commercial silica. Increases in demand and constrained supply have led to continued price increases in the last
several years. The United States Geological Survey (USGS), in a report dated February 2011, estimated an industry-wide average price of $23.86 per ton in 2006 relative to a $31.53 per ton price in 2010, which represents a 7.2% annual increase. For
reference, our overall average realized price per ton, excluding transportation, was $25.81 in 2006, $35.22 in 2010, $40.07 in 2011, and $46.24 through the first nine months of 2012. While we have seen some variability in pricing due to a slight
decline in rig count as a result of softening market pricing for natural gas, we expect that these trends are short-term in nature and that the long-term continued growth of horizontal drilling, combined with increased innovation in specialty
markets will exert some level of continued longer-term upward pressure on prices in both of our operating segments.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

During the first half of 2012, as natural gas prices declined, we saw certain E&Ps curtailing their drilling efforts in dry gas basins and redeploying their drilling rigs to oil and liquid rich
basins due to the higher market price of oil and liquids relative to natural gas. This shift in drilling activity resulted in increased demand for coarser grade frac sands relative to the finer grades typically used for drilling dry natural gas.
During the third quarter of 2012 as natural gas prices began to recover, demand for our finer grade sands has also increased in select basins. Because of our logistics capabilities, we are able to service our customers and ship materials to the
basins where demand calls for it.

Additionally, in connection with lower natural gas demand and natural gas prices, the North
American land rig count has slightly decreased. We believe this trend for active North American horizontal rigs will continue for the remainder of 2012. While this has created challenges for many service companies in the domestic oil and gas sector,
we continue to see modest growth in demand for frac sand driven by continued innovation in the hydraulic fracturing process, which has led to the increased use of proppants due to longer laterals, more stages, and greater proppant density per stage.

Our Strategy

The key drivers of our growth strategy include:



| |  |  | Expand our proppant production capacity and product portfolio. During the fourth quarter of 2011, we executed several initiatives to increase
our frac sand production capacity and augment our proppant product portfolio. At our Ottawa, Illinois facility, we implemented operating improvements and installed a new dryer and six mineral separators to increase our annual frac sand production
capacity by 900,000 tons. At our Rockwood, Michigan facility, we added 250,000 tons of annual frac sand production capacity by installing a new processing circuit. We are also currently constructing a new resin-coated sand facility that has the
capacity to produce up to 400 million pounds of resin-coated sand annually, which will be operational in the first quarter of 2013. We expect to continue to fund this project through a combination of cash on our balance sheet and cash generated
from our operations.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Increase our exposure to attractive industrial and specialty products end markets. We intend to increase our exposure and market share in
certain Industrial and Specialty Products end markets that we believe are poised for growth. For example, at our Rockwood facility, we have doubled our production capacity for low-iron silica, which is used to maximize light transmission in
ultra-clear architectural glass and solar panels. Additionally, in 2010 we opened a representative office in Shanghai, China to market our fine ground silica products across the Asia Pacific region for use in specialty end markets. We are also
exploring opportunities to grow our presence in the specialty coatings and polymer additives end markets, where our ultra-fine ground silica is used to enhance strength, scratch resistance and stability.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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##### Table of Contents

| |  |  | Optimize product mix and further develop value-added capabilities to maximize margins. We will continue to actively manage our product mix at
each of our plants to ensure we are maximizing our profit margins. This requires us to use our proprietary expertise in balancing key variables, such as mine geology, processing capacities, transportation availability, customer requirements and
pricing. We also expect to continue investing in ways to increase the value we provide to our customers by expanding our product offerings, increasing our transportation assets, improving our supply chain management and upgrading our information
technology. We hope to use these strategies to increase our operating income faster than our tons sold into the future.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Evaluate both Greenfield and Brownfield expansion opportunities. We will continue to leverage our reputation, processing capabilities and
infrastructure to increase production, as well as explore other opportunities to expand our reserve base. We may accomplish this by developing Greenfield projects, where we can capitalize on our technical knowledge of geology, mining and processing
and our strong reputation within local communities. In December 2011, we acquired additional ore reserves near Sparta, Wisconsin. We commenced construction of this production facility during the second quarter of 2012 and expect the facility to be
completed and fully operational in the second quarter of 2013. Additionally, we may pursue bolt on and other opportunistic acquisitions, taking advantage of our asset footprint, our managements experience with high-growth
businesses and our strong customer relationships. We may also evaluate international acquisitions as unconventional oil and natural gas drilling expands globally.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Maintain financial strength and flexibility. We intend to maintain financial strength and flexibility to enable us to pursue acquisitions and
new growth opportunities as they arise. As of September 30, 2012, we had $93.0 million of cash on hand and $23.8 million of available borrowings under our credit facilities.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

How We Generate Our Sales

We derive our sales by mining and processing minerals that our customers purchase for various uses. Our sales are primarily a function of
the price per ton realized and the volumes sold. In some instances, our sales also include a charge for transportation services we provide to our customers. Our transportation revenue fluctuates based on a number of factors, including the volume of
product we transport under contract, service agreements with our customers, the mode of transportation utilized and the distance between our plants and customers.

We primarily sell our products under short-term price agreements or at prevailing market rates. For a limited number of customers, we sell under long-term, competitively-bid supply agreements. As of
November 2, 2012, we have nine take-or-pay supply agreements with nine of our customers in the Oil and Gas Proppants end market with initial terms expiring between 2012 and 2016. These agreements define, among other commitments, the volume of
product that our customers must purchase, the volume of product that we must provide and the price that we will charge and that our customers will pay for each product. Prices under these agreements are generally fixed and subject to upward
adjustment in response to certain cost increases. As a result, our realized prices may not grow at rates consistent with broader industry pricing. For example, during periods of rapid price growth, our realized prices may grow more slowly than those
of competitors, and during periods of price decline, our realized prices may outperform industry averages. Additionally, at the time the take-or-pay supply agreements were signed, two of these customers provided advance payments for future shipments
aggregating $27.0 million ($7.1 million of these payments was recorded on the balance sheet as deferred revenue as of September 30, 2012). A percentage of these advance payments is recognized as revenue with each ton of applicable product
shipped to the customer. Collectively, sales to customers with supply agreements accounted for nearly 31% of our total sales revenues during both the three months ended September 30, 2012 and 2011, and 18% of our total sales revenues during
both the nine months ended September 30, 2012 and 2011, respectively.

We invoice the majority of our customers on a per
shipment basis, although for some larger customers, we consolidate invoices weekly or monthly. The amounts invoiced include the amount charged for the product, transportation costs (if paid by us) and costs for additional services as applicable,
such as costs related to transload the product from railcars to trucks for delivery to the customer site.

The Costs of Conducting Our
Business

The principal expenses involved in conducting our business are labor costs, electricity and drying fuel costs,
maintenance and repair costs for our mining and processing equipment and facilities and transportation costs. We believe the majority of our operating costs are relatively stable in price, but can vary significantly based on the volume of product
produced. We benefit from owning the majority of the mineral deposits that we mine and having long-term mineral rights leases or supply agreements for our other primary sources of raw material, which limit royalty payments.



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Operating labor costs represented our largest spend category at approximately 12% and 17% of
our sales during the three months ended September 30, 2012 and 2011, respectively, and approximately 13% and 17% of our sales during the nine months ended September 30, 2012 and 2011, respectively. We employ a mix of union and non-union
labor, with 52% of our workforce being unionized as of September 30, 2012. Our union contracts stipulate annual escalation factors for certain wages and benefits.

We incur significant electricity and drying fuel (principally natural gas) costs in connection with the operation of our processing facilities. Energy costs directly related to the production of our
products represented 4% and 8% of our total sales during the three months ended September 30, 2012 and 2011, respectively, and approximately 5% and 8% of our total sales during the nine months ended September 30, 2012 and 2011,
respectively.

We capitalize the costs of our mining equipment and generally depreciate it over its expected useful life.
Depreciation, depletion and amortization costs represented approximately 5% and 7% of our sales during the three months ended September 30, 2012 and 2011, respectively and 6% and 7% of our sales during the nine months ended September 30,
2012 and 2011, respectively. Preventive and remedial repair and maintenance costs that do not involve the replacement of major components of our equipment and facilities are expensed as incurred. These repair and maintenance costs can be significant
due to the abrasive nature of our products and represented approximately 5% and 7% of our sales during the three months ended September 30, 2012 and 2011, respectively, and approximately 6% and 8% of our sales during the nine months ended
September 30, 2012 and 2011, respectively.

We also provide a range of logistical services to our customers, including
management of truck, rail and barge shipments of our products. Total related transportation costs represented approximately 22% and 15% of sales during the three months ended September 30, 2012 and 2011, respectively, and approximately 19% and
14% of sales during the nine months ended September 30, 2012 and 2011, respectively. During the last twelve months, transportation costs, as a percentage of total revenue, have continued to increase in connection with our increased in-basin
transload activity. These costs, together with costs for additional logistical services, are billed back to our customers.

Additionally, we incur expenses related to our corporate operations, including costs for the sales and marketing, research and
development, finance, legal, and environmental, health and safety functions of our organization. These costs are principally driven by personnel expenses. In total, our selling, general and administrative costs represented approximately 9% and 9% of
sales during the three and nine months ended September 30, 2012, respectively, and 9% and 8% of sales during the three and nine months ended September 30, 2011, respectively. As a public company, we will continue to incur additional legal,
accounting, insurance and other expenses that we had not incurred prior to 2012 as a private company, including costs associated with public company reporting requirements. These requirements include compliance with the Sarbanes-Oxley Act of 2002 as
well as other rules implemented by the SEC, and applicable stock exchange rules.

Our effective income tax rate was
approximately 28% and 27% of pretax earnings in the nine months ended September 30, 2012 and 2011, respectively. Historically, our actual effective tax rates have been lower than the statutory effective rate primarily due to the benefit received
from statutory percentage depletion allowances.

How We Evaluate Our Business

Our management team evaluates our business using a variety of financial and operational metrics to analyze our performance. Our business
is organized into two segments, Oil & Gas Proppants and Industrial & Specialty Products. We evaluate the performance of these segments based on their volumes sold, average realized price and contribution margin earned.
Additionally, we consider a number of factors in evaluating the performance of the business as a whole, including total volumes sold, average realized price, segment contribution margin and Adjusted EBITDA. We view these metrics as important factors
in evaluating our profitability and review these measurements frequently to analyze trends and make decisions.

Segment
Contribution Margin

Segment contribution margin, a non-GAAP measure, is a key metric that management uses to evaluate our
operating performance and to determine resource allocation between segments. Segment contribution margin excludes certain corporate costs not associated with the operations of the segment. These unallocated costs include costs related to corporate
functional areas such as sales, production and engineering, corporate purchasing, accounting, treasury, information technology, legal and human resources.



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Adjusted EBITDA

Adjusted EBITDA, a non-GAAP measure, is included in this report because it is a key metric used by management to assess our operating
performance and by our lenders to evaluate our covenant compliance. Our target performance goals under our incentive compensation plan are tied, in part to our Adjusted EBITDA. In addition, our revolving credit facility (the Revolver)
contains a fixed charge coverage ratio covenant that we must meet if our excess availability (as defined in the Revolver) falls below $10.0 million, and our Term Loan contains a consolidated leverage ratio covenant that we must meet at the end of
each fiscal quarter, both of which are calculated based on our Adjusted EBITDA. Noncompliance with the financial ratio covenants contained in the Revolver and the Term Loan could result in the acceleration of our obligations to repay all amounts
outstanding under those agreements. Moreover, the Revolver and the Term Loan contain covenants that restrict, subject to certain exceptions, our ability to make permitted acquisitions, incur additional indebtedness, make restricted payments
(including dividends) and retain excess cash flow based, in some cases, on our ability to meet leverage ratios calculated based on our Adjusted EBITDA.

Results of Operations for the Three Months Ended September 30, 2012 and 2011



|                                |  |                                         |         |  |               |   |        |             |  |  |        |  
|------------------------------- |  | --------------------------------------- | ------- |  | ------------- | - | ------ | ----------- |  |  | ------ | -
|                                |  | For the Three Months EndedSeptember 30, |         |  | PercentChange |  
|                                |  | 2012                                    |         |  | 2011          |   |        | 12 vs. 11 | 
|Sales                           |  |                                         |         |  |               |   |        |             |  |  |        |  
|Oil & Gas Proppants             |  | $                                       | 64,538  |  |               | $ | 24,246 |             |  |  | >100.0 | %
|Industrial & Specialty Products |  |                                         | 51,347  |  |               |   | 49,207 |             |  |  | 4.3    | %
|                                |  |                                         |         |  |               |   |        |             |  |  |        |  
|Total Sales                     |  | $                                       | 115,885 |  |               | $ | 73,453 |             |  |  | 57.8   | %
|                                |  |                                         |         |  |               |   |        |             |  |  |        |  

Sales

Sales increased $42.4 million, or 58%, to $115.9 million for the three months ended September 30, 2012 compared to $73.5 million for the three months ended September 30, 2011. Oil & Gas
Proppants sales increased by $40.3 million, accounting for nearly 95% of the total sales growth. Industrial & Specialty Products sales increased $2.1 million, representing 5% of the growth in overall sales.

Oil & Gas Proppants sales increased $40.3 million, or 166%, to $64.5 million for the three months ended September 30, 2012
compared to $24.2 million for the three months ended September 30, 2011. The growth in sales revenue was driven by a combination of increases in volume and pricing. Oil & Gas Proppants volume increased 310.2 thousand tons, or 68%, to
769.0 thousand tons during the three months ended September 30, 2012, driven by year over year growth in the demand for our frac sands and natural proppants. Period over period in response to the continued growth in hydraulic fracturing
activity and in an effort to meet demand, we have reallocated certain production from industrial end markets to the Oil and Gas Proppants end market.

Industrial & Specialty Products sales increased $2.1 million, or 4%, to $51.3 million for the three months ended September 30, 2012 compared to $49.2 million for the three months ended
September 30, 2011. Period over period growth was driven primarily by pricing with volumes nearly flat, declining only marginally by 4.4 thousand tons, or less than 1%, as we continue to optimize our product mix to maximize margins and
profitability.

Selling, General and Administrative Expenses

Selling, general and administrative expenses increased $4.9 million, or 94%, to $10.1 million for the three months ended
September 30, 2012 compared to $5.2 million for the three months ended September 30, 2011 driven by approximately $1.3 million of year over year increases in employee compensation and benefits related to headcount increase in our sales and
marketing function to support the continued growth in our oil and gas business as well as increases in corporate headcount to support our transformation as a public company. Additionally, we continue to incur additional public company costs as well
as costs related to growth and expansion initiatives, which include legal, audit and accounting, and consulting and advisory services expenses, which have grown nearly $1.0 million period over period.

Depreciation, Depletion and Amortization

Depreciation, depletion and amortization expense was $6.0 million and $5.3 million for the three months ended September 30, 2012, and 2011, respectively. Year over year increases have been driven by
continued increases in capital spending combined with increased depletion due to additional volume of mined silica sands. We expect depreciation, depletion and amortization expense to continue to grow due to a significant increase in capital
spending in 2012 for assets which will be placed into service during the fourth quarter of 2012 and first half of 2013.

Operating Income

Operating income increased $12.7 million, or 73%, to $30.1 million for the three months ended September 30, 2012 compared to $17.4 million for the three months ended September 30, 2011 guided by
a 58% increase in sales and a 4% increase in gross margin.

Interest Expense

Interest expense decreased $0.5 million, or 13%, to $3.3 million for the three months ended September 30, 2012 compared to $3.8
million for the three months ended September 30, 2011. These savings during the three months ended



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September 30, 2012, were due to the conversion to equity of the $15.0 million note payable to our former parent in connection with our initial public offering in January 2012. The note had a
stated interest rate equal to 10.0%. The refinancing transaction and the conversion of the note payable drove a reduction in the effective interest rate on our debt for the three months ended September 30, 2012 to 5.06%, compared to an
effective rate of 5.32% for the three months ended September 30, 2011.

Provision for Income Taxes

The provision for income taxes increased $4.9 million, or 143%, to $8.3 million for the three months ended September 30, 2012,
compared to $3.4 million for the three months ended September 30, 2011 driven by an increase in pre-tax income of 97%. The effective tax rates were 31% for the three months ended September 30, 2012 and 25% for the three months ended
September 30, 2011. The increased effective tax rate for the three months ended September 30, 2012 was primarily associated with the filing of our prior year tax returns and revisions to the estimated current year statutory depletion
deduction and domestic production deduction.

Net Income/Loss

Net income was $18.8 million and $10.3 million for the three months ended September 30, 2012, and 2011, respectively. Year over year
increases are due to the factors noted above.

Results of Operations for the Nine Months Ended September 30, 2012 and 2011



|                                |  |                                         |         |  |               |   |         |             |  |  |        |  
|------------------------------- |  | --------------------------------------- | ------- |  | ------------- | - | ------- | ----------- |  |  | ------ | -
|                                |  | For the Nine Months 
EndedSeptember 30, |         |  | PercentChange |  
|                                |  | 2012                                    |         |  | 2011          |   |         | 12 vs. 11 | 
|Sales                           |  |                                         |         |  |               |   |         |             |  |  |        |  
|Oil & Gas Proppants             |  | $                                       | 172,845 |  |               | $ | 69,322  |             |  |  | >100.0 | %
|Industrial & Specialty Products |  |                                         | 150,230 |  |               |   | 142,643 |             |  |  | 5.3    | %
|                                |  |                                         |         |  |               |   |         |             |  |  |        |  
|Total Sales                     |  | $                                       | 323,075 |  |               | $ | 211,965 |             |  |  | 52.4   | %
|                                |  |                                         |         |  |               |   |         |             |  |  |        |  

Sales

Sales increased $111.1 million, or 52.4%, to $323.1 million for the nine months ended September 30, 2012 compared to $212.0 million for the nine months ended September 30, 2011. Oil &
Gas Proppants sales increased by $103.5 million, accounting for nearly 93% of the total sales growth. Industrial & Specialty Products sales increased $7.6 million, representing 7% of the growth in overall sales.

Oil & Gas Proppants sales increased $103.5 million, or 149%, to $172.8 million for the nine months ended September 30, 2012
compared to $69.3 million for the nine months ended September 30, 2011. The growth in sales revenue was driven by a combination of increases in volume and pricing. Oil & Gas Proppants volume increased 705.3 thousand tons, or 49%, to
2.133 million tons during the nine months ended September 30, 2012, driven by continued growth in the demand for our frac sands and natural proppants. In response to the continued growth in hydraulic fracturing activity and in an effort to meet
demand, we have reallocated certain production from industrial end markets to the Oil & Gas Proppants end market.

Industrial & Specialty Products sales increased $7.6 million, or 5%, to $150.2 million for the nine months ended
September 30, 2012 compared to $142.6 million for the nine months ended September 30, 2011. The improvement in sales was due to increases in pricing across most of our end markets combined with an increase in volumes of 17.2 thousand tons,
or 1%, to 3.277 million tons during the nine months ended September 30, 2012. Volume growth in our Industrial & Specialty Products segment remains constrained as we continue to optimize our product mix to maximize margins and
profitability.

Selling, General and Administrative Expenses

Selling, general and administrative expenses increased $13.3 million, or 80%, to $29.8 million for the nine months ended
September 30, 2012 compared to $16.5 million for the nine months ended September 30, 2011 driven by approximately $6.8 million of year over year increases in employee compensation and benefits related to headcount increase in our sales and
marketing function to support the continued growth in our oil and gas business as well as increases in corporate headcount to support our transformation as a public company. We continue to incur additional public company costs as well as costs
related to growth and expansion initiatives, which include legal, audit and accounting, and consulting and advisory services expenses, which have grown nearly $2.7 million year over year. Additionally, we incurred additional compensation expense of
$1.0 million related to awards of equity instruments to certain management and employees. As a percentage of sales, selling, general and administrative expenses increased 1.4% over prior year.



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##### Table of Contents

Depreciation, Depletion and Amortization

Depreciation, depletion and amortization expense was $17.9 million and $15.6 million for the nine months ended September 30, 2012,
and 2011, respectively. Year over year increases have been driven by continued increases in capital spending combined with increased depletion due to additional volume of mined silica sands. We expect depreciation, depletion and amortization expense
to continue to grow due to a significant increase in capital spending in 2012 for assets which will be placed into service during the fourth quarter of 2012 and the first half of 2013.

Operating Income

Operating income increased $42.1 million, or nearly 88%, to $89.9 million for the nine months ended September 30, 2012 compared to $47.8 million for the nine months ended September 30, 2011
guided by a 52% increase in sales and a 12% increase in gross margin.

Interest Expense

Interest expense decreased $4.0 million, or 27%, to $10.6 million for the nine months ended September 30, 2012 compared to $14.5
million for the nine months ended September 30, 2011. These savings during the nine months ended September 30, 2012, were due to a refinancing of the Term Loan and repayment of the Mezzanine Loan Facility in the second quarter of 2011, as
well as the conversion to equity of the $15.0 million note payable to our former parent in connection with our initial public offering in January 2012. The note had a stated interest rate equal to 10.0%. The refinancing transaction and the
conversion of the note payable drove a reduction in the effective interest rate on our debt for the nine months ended September 30, 2012 to 5.04%, compared to an effective rate of 6.40% for the nine months ended September 30, 2011.

Provision for Income Taxes

The provision for income taxes increased $15.1 million, or 208%, to $22.6 million for the nine months ended September 30, 2012, compared to $7.5 million for the nine months ended September 30,
2011 driven by an increase in pre-tax income of 188%. The effective tax rates were 28% for the nine months ended September 30, 2012 and 27% for the nine months ended September 30, 2011.

Net Income/Loss

Net income was $57.4 million and $20.2 million for the nine months ended September 30, 2012, and 2011, respectively. Year over year increases are due to the factors noted above.

Liquidity and Capital Resources

Overview

Our
principal liquidity requirements have historically been to service our debt, to meet our working capital, capital expenditure and mine development expenditure needs, to pay dividends to our stockholder, and to finance acquisitions. We have
historically met our liquidity and capital investment needs with funds generated through operations. We have historically funded our acquisitions through borrowings under our credit facilities and equity investments. Our working capital is the
amount by which current assets exceed current liabilities and is a measure of our ability to pay our liabilities as they become due. As of September 30, 2012, our working capital was $130.2 million and we had $23.8 million of availability under
the Revolver. See Credit FacilitiesRevolver.

We believe that cash generated through operations and
our financing arrangements will be sufficient to meet working capital requirements, anticipated capital expenditures and scheduled debt payments for at least the next 12 months. We anticipate that we will retain all of our future earnings for use in
the development and expansion of our business and for general corporate purposes. Any determination to pay dividends and other distributions in cash, stock, or property by Holdings in the future will be at the discretion of our Board of Directors
and will be dependent on then-existing conditions, including our business conditions, our financial condition, results of operations, liquidity, capital requirements, contractual restrictions including restrictive covenants contained in debt
agreement, and other factors. Additionally, because we are a holding company, our ability to pay dividends on our common stock is limited by restrictions on the ability of our subsidiaries to pay dividends or make distributions to us, including
restrictions under the terms of the agreements governing our indebtedness.



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Cash Flow Analysis

A summary of operating, investing and financing activities is shown in the following table:



|                                |  |                                         |         |   |               |   |         |             |  |  |        |  
|------------------------------- |  | --------------------------------------- | ------- | - | ------------- | - | ------- | ----------- |  |  | ------ | -
|                                |  | For the Nine Months 
EndedSeptember 30, |         |   | PercentChange |  
|                                |  | 2012                                    |         |   | 2011          |   |         | 12 vs. 11 | 
|Net cash provided by (used in): |  |                                         |         |   |               |   |         |             |  |  |        |  
|Operating activities            |  | $                                       | 69,989  |   |               | $ | 22,395  |             |  |  | >100.0 | %
|Investing activities            |  |                                         | (73,613 | ) |               |   | (28,692 | )           |  |  | >100.0 | %
|Financing activities            |  |                                         | 37,435  |   |               |   | 15,606  |             |  |  | >100.0 | %

Net Cash Provided by Operating Activities

Operating activities consist primarily of net income adjusted for non-cash items, including depreciation and amortization, deferred
revenue, deferred income taxes, equity-based compensation and the effect of working capital changes.

Net cash provided by
operating activities was $70.0 million for the nine months ended September 30, 2012 compared to $22.4 million for the nine months ended September 30, 2011. This $47.6 million increase in cash provided by operations was primarily the result
of a $42.1 million improvement in operating income driven by an increase in sales of 52.4%, offset by a one-time termination fee payment related to the Advisory Agreement of $8.0 million which was accrued at December 31, 2011 and made during
the first quarter of 2012 and the net build in working capital year over year of $5.5 million. Several non-cash adjustments during the nine months ended September 30, 2012 and 2011, including a $6.0 million loss related to the early
extinguishment of debt in 2011, netted to a minimal impact on cash flows for each period presented.

Net Cash Used in
Investing Activities

Investing activities consist primarily of capital expenditures for growth and maintenance.

Net cash used in investing activities was $73.6 million in the nine months ended September 30, 2012. This use of cash is
due to capital expenditures which totaled $74.9 million for the nine months ended September 30, 2012, partially offset by proceeds of $1.3 million received from the sale of a building and various equipment. Capital expenditures in 2012 have
been primarily for the construction of our resin coating production facility in Rochelle, Illinois and the engineering, procurement and construction of a Greenfield raw sand plant in Sparta, Wisconsin. Additionally, we have invested $7.0 million for
new equipment, maintenance and upgrades to improve efficiency at our current production facilities, and acquired $0.7 million of additional land and reserves during the period.

Net cash used in investing activities was $28.8 million for the nine months ended September 30, 2011. This use of cash is primarily
due to capital expenditures to expand our production capacity at two of our facilities.

Management anticipates that our
capital expenditures for 2012 will be approximately $98-108 million, which is primarily associated with our two new facilities in Rochelle, Illinois and Sparta, Wisconsin which are currently under construction. We anticipate that this amount will be
sufficient to complete these projects.

Net Cash Provided by Financing Activities

Financing activities consisted primarily of equity issuances and repurchases, capital contributions, borrowings and repayments related to
the ABL and Term Loan Facilities, as well as fees and expenses paid in connection with our credit facilities and outstanding checks from our customers.

Net cash provided by financing activities was $37.4 million in the nine months ended September 30, 2012. During the period, we amended and restated the Term Loan to reduce the covenants and
restrictions on our activities. In connection with the amendment, we incurred $1.3 million in financing fees which have been capitalized and are being amortized over the remaining life of the loan.

On January 31, 2012, we completed an initial public offering of 2,941,176 shares of our common stock at an offering price of $17.00
per share for an aggregate offering price of approximately $50.0 million (the IPO). As a result of the IPO, we received net proceeds of approximately $40.8 million, after deducting $3.5 million of underwriting discounts and
commissions and offering expenses of $5.7 million.

Simultaneously with the IPO, GGC USS Holdings, LLC, our parent and sole
stockholder prior to the IPO and now largest stockholder, contributed to us all of the stock of its wholly-owned subsidiary, GGC RCS Holdings, Inc., whose operating subsidiary is Coated Sand Solutions, LLC. Prior to this transaction, GGC RCS
Holdings, Inc. had a $15.0 million note payable to GGC USS Holdings, LLC which, together with accrued interest of $1.7 million, was converted to an equity contribution by GGC USS Holdings, LLC simultaneously to the IPO.



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Additionally, during the nine months ended September 30, 2012, we made scheduled
principal repayments on our outstanding debt of $1.95 million.

Net cash provided by financing activities during the nine
months ended September 30, 2011 was $15.6 million. During the period, we refinanced the Term Loan and increased the outstanding principal by $95.0 million to $260 million. $75.0 million of the proceeds was used to prepay the Mezzanine Loan
Facility in full. We incurred financing fees of $3.9 million and a repayment penalty of $1.5 million in connection with the refinancing.

Share Repurchase Program

On June 11, 2012, the Board of Directors authorized the repurchase up to $25.0 million of our common stock. The authorization remains open for a period of 18 months, concluding on December 11,
2013. We are authorized to repurchase, from time to time, shares of our outstanding common stock on the open market or in privately negotiated transactions. Stock repurchases will be funded using our available cash. The timing and amount of stock
repurchases will depend on a variety of factors, including the market conditions as well as corporate and regulatory considerations. The share repurchase program may be suspended, modified or discontinued at any time and we have no obligation to
repurchase any additional amount of our common stock under the program. We intend to make all repurchases in compliance with applicable regulatory guidelines and to administer the plan in accordance with applicable laws, including Rule 10b-18 of the
Securities Exchange Act of 1934, as amended.

During the first nine months of 2012, we purchased 100,000 shares pursuant to
the authorization for $1.072 million as outlined in the following table:



|                               |  |                                |         |  |                            |   |       |                                                                         |  |  |                                                                               |  |  |   |            | 
|------------------------------ |  | ------------------------------ | ------- |  | -------------------------- | - | ----- | ----------------------------------------------------------------------- |  |  | ----------------------------------------------------------------------------- |  |  | - | ---------- | 
|Period                         |  | Total Number ofSharesPurchased |         |  | Average PricePaid PerShare |   |       | Total Number ofShares Purchased asPart of Publicly
Announced Program(1) |  |  | Maximum Dollar Value of
Shares that May Yet Be Purchased Under the Program(1) | 
|June 2012                      |  |                                | 20,000  |  |                            | $ | 10.74 |                                                                         |  |  | 20,000                                                                        |  |  |   |            | 
|August 2012                    |  |                                | 80,000  |  |                            | $ | 10.70 |                                                                         |  |  | 80,000                                                                        |  |  |   |            | 
|                               |  |                                |         |  |                            |   |       |                                                                         |  |  |                                                                               |  |  |   |            | 
|Total as of September 30, 2012 |  |                                | 100,000 |  |                            | $ | 10.72 |                                                                         |  |  | 100,000                                                                       |  |  | $ | 23,928,275 | 



|(1) | The program covering the repurchase of up to $25.0 million of our common stock was announced on June 12, 2012. This program expires on
December 11, 2013.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------

Subsequent to September 30, 2012, we repurchased no additional shares of our
common stock. As of November 2, 2012, we have the authorization to repurchase up to $23.9 million of our common stock under the program.

Credit Facilities

Revolver

On August 9, 2007, we entered into the Revolver with various banks and other financial institutions as lenders thereunder and Wells
Fargo Bank, National Association (successor by merger to Wachovia Bank, National Association) as administrative agent and lender. The Revolver provides for borrowings in the aggregate amount of up to $35.0 million, with a letter of credit facility
sublimit of $15.0 million; provided, however, that the aggregate principal amount of the loans and letter of credit obligations outstanding at any one time shall not exceed the applicable borrowing base.

Borrowing availability under the Revolver is determined by a formula that considers eligible accounts receivable and inventory less any
outstanding letters of credit plus a reserve for derivatives. We had no borrowings outstanding as of September 30, 2012, and had $10.0 million of outstanding letters of credit and $1.2 million reserved against derivative agreements, leaving
$23.8 million of available borrowings under the Revolver.

Borrowings under the Revolver are subject to the accuracy of
representations and warranties in all material respects and the absence of any defaults under the Revolver and the Term Loan.

On January 31, 2012, the Revolver was amended and restated to reduce the covenants and restrictions on our activities. The Revolver,
as amended, contains customary covenants and restrictions on our activities related to, among other things: the incurrence of additional indebtedness; liens; dividends and distributions; investments, acquisitions and speculative transactions;
contingent obligations; transactions with affiliates; fundamental changes to our business, property and assets; insurance; sale lease-backs; the ability to change the nature of our business, our fiscal year and our accounting policies; the ability
to amend or waive any of the terms of any permitted subordinated debt, the Term Loan and our organizational documents; designations of senior debt other than the Revolver obligations and the Term Loan obligations; and the performance of material
contracts, including intellectual property licenses. The Revolver also requires that we maintain (a) during any fiscal quarter, if excess availability falls below $6.5 million, a fixed charge coverage ratio of not less than 1.10 to 1.00 until
excess availability is equal to or greater than $10.0 million and (b) aggregate excess availability of not less than $5.0 million at all times.



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Term Loan

On November 25, 2008, in connection with our acquisition by an affiliate of Golden Gate Capital (the Golden Gate Capital Acquisition), we entered into the Term Loan with various banks and
other financial institutions as lenders thereunder and BNP Paribas, as administrative agent. On May 7, 2010, the Term Loan was amended and restated to, among other things, (1) increase the aggregate principal amount available thereunder
from $102.0 million to $165.0 million and (2) add an incremental term loan facility in the maximum aggregate principal amount of $25.0 million. On June 8, 2011, the Term Loan was again amended and restated to, among other things,
(1) further increase the aggregate principal amount available thereunder to $260.0 million and (2) increase the maximum aggregate principal amount under the incremental Term Loan to $50.0 million (or $100.0 million if the total leverage
ratio on a pro forma basis would not exceed 3x).

On January 27, 2012, we again amended and restated the Term Loan to reduce
the covenants and restrictions on our activities. The Term Loan, as amended, contains customary covenants and restrictions on our activities related to, among other things: the incurrence of additional indebtedness; liens and negative pledges;
dividends and distributions; investments and acquisitions; contingent obligations; transactions with stockholders (holders of at least 10% of the equity securities) and affiliates; fundamental changes to our business, property and assets; sale
lease-backs; the ability to change the nature of our business, our fiscal year and our accounting policies; the ability to amend or waive any of the terms of the Revolver and other material agreements; designations of senior debt other than the Term
Loan obligations and the Revolver obligations; and the performance of material contracts, including real property leases and intellectual property licenses.

Off-Balance Sheet Arrangements

We have no off-balance sheet arrangements
that have or are likely to have a current or future material effect on our financial condition, changes in financial condition, sales, expenses, results of operations, liquidity, capital expenditures or capital resources.

Contractual Obligations

There have been no significant changes to our Contractual Obligations table in Part I, Item 2, Managements
Discussion and Analysis of Financial Condition and Results of Operations, of our 2011 Annual Report, other than three new rail car lease agreements that were signed for 106 rail cars which will be paid at $77 thousand per month over the next
three to six years.

As of September 30, 2012, debt had decreased by $1.8 million to $260.0 million compared to $261.8
million at December 31, 2011, due to scheduled principal repayments of $1.95 million, net of the amortization of the original issue discount of $126 thousand. As of September 30, 2012, future debt payments, plus interest, totaled $313.0
million and are due as follows: $7.7 million in 2012; $14.7 million in 2013; $14.6 million in 2014; $14.5 million in 2015; $135.8 million in 2016; and $125.7 million thereafter.

As described in Note N, future minimum lease payments totaled $49.5 million and are due as follows: $10.5 million in 2012; $10.2 million
in 2013; $7.5 million in 2014; $6.8 million in 2015; $5.4 million in 2016; and $9.2 million thereafter.

Environmental Matters

We are subject to various federal, state and local laws and regulations governing, among other things, hazardous
materials, air and water emissions, environmental contamination and reclamation and the protection of the environment and natural resources. We have made, and expect to make in the future, expenditures to comply with such laws and regulations, but
cannot predict the full amount of such future expenditures. We may also from time to time incur fines and penalties associated with noncompliance with such laws and regulations. In particular, on September 8, 2011 we voluntarily disclosed
potential violations of air emission permits at our Rockwood, Michigan facility to the EPA and the Michigan Department of Environmental Quality, and while no proceedings have been instituted at this time by either agency we could incur penalties or
be subject to other requirements in the future as a result of such potential violations. As of September 30, 2012, we had $10.0 million accrued for future reclamation costs, as compared to $9.5 million as of December 31, 2011.

We discuss certain environmental matters relating to our various production and other facilities, certain regulatory requirements
relating to human exposure to crystalline silica and our mining activity and how such matters may affect our business in the future under Item 1A, Risk Factors and Part II, Item 1, Legal Proceedings in our 2011
Annual Report.



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Non-GAAP Financial Performance Measures

Segment Contribution Margin

Oil & Gas Proppants
contribution margin increased $18.6 million, or 119%, to $34.2 million for the three months ended September 30, 2012 compared to $15.6 million for the three months ended September 30, 2011. Oil & Gas Proppants contribution margin
increased $58.7 million, or nearly 134%, to $102.6 million for the nine months ended September 30, 2012 compared to $43.8 million for the nine months ended September 30, 2011 due to the factors noted above.

Industrial & Specialty Products contribution margin increased $0.5 million, or 3%, to $14.2 million for the three months ended
September 30, 2012 compared to $13.7 million for the three months ended September 30, 2011. Industrial & Specialty Products contribution margin increased $2.1 million, or 5%, to $40.6 million for the nine months ended
September 30, 2012 compared to $38.5 million for the nine months ended September 30, 2011 due to the factors noted above.

Segment contribution margin is not a measure of our financial performance under GAAP. For more detail on the reconciliation of segment contribution margin to its most directly comparable GAAP
financial measure, income (loss) before income taxes, see Note T to our Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.

Adjusted EBITDA

Adjusted EBITDA is not a measure of our financial
performance or liquidity under GAAP and should not be considered as an alternative to net income as a measure of operating performance, cash flows from operating activities as a measure of liquidity or any other performance measure derived in
accordance with GAAP. Additionally, Adjusted EBITDA is not intended to be a measure of free cash flow for managements discretionary use, as it does not consider certain cash requirements such as interest payments, tax payments and debt service
requirements. Adjusted EBITDA contains certain other limitations, including the failure to reflect our cash expenditures, cash requirements for working capital needs and cash costs to replace assets being depreciated and amortized, and excludes
certain non-recurring charges. Management compensates for these limitations by relying primarily on our GAAP results and by using Adjusted EBITDA only supplementally. Our measure of Adjusted EBITDA is not necessarily comparable to other similarly
titled captions of other companies due to potential inconsistencies in the methods of calculation.



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The following table sets forth a reconciliation of net income, the most directly comparable
GAAP financial measure, to Adjusted EBITDA.



|                                                                    |  |                                  |        |   |                                |   |        |      |  |   |         |   |  |   |        |  
|------------------------------------------------------------------- |  | -------------------------------- | ------ | - | ------------------------------ | - | ------ | ---- |  | - | ------- | - |  | - | ------ | -
|                                                                    |  | Three Months 
EndedSeptember 30, |        |   | Nine Months
EndedSeptember 30, |  
|                                                                    |  | 2012                             |        |   | 2011                           |   |        | 2012 |  |   | 2011    |  
|Net income                                                          |  | $                                | 18,796 |   |                                | $ | 10,342 |      |  | $ | 57,360  |   |  | $ | 20,208 |  
|Total interest expense, net of interest income                      |  |                                  | 3,276  |   |                                |   | 3,823  |      |  |   | 10,422  |   |  |   | 14,481 |  
|Provision for taxes                                                 |  |                                  | 8,302  |   |                                |   | 3,412  |      |  |   | 22,621  |   |  |   | 7,533  |  
|Total depreciation, depletion and amortization expenses             |  |                                  | 5,968  |   |                                |   | 5,295  |      |  |   | 17,920  |   |  |   | 15,636 |  
|                                                                    |  |                                  |        |   |                                |   |        |      |  |   |         |   |  |   |        |  
|EBITDA                                                              |  |                                  | 36,342 |   |                                |   | 22,872 |      |  |   | 108,323 |   |  |   | 57,858 |  
|Non-recurring expense (income)(1)                                   |  |                                  | (30    | ) |                                |   | (1,295 | )    |  |   | (469    | ) |  |   | (1,295 | )
|Transaction expenses(2)                                             |  |                                  |       |   |                                |   |       |      |  |   | 156     |   |  |   | 6,043  |  
|Permitted management fees and expenses(3)                           |  |                                  |       |   |                                |   | 312    |      |  |   |        |   |  |   | 938    |  
|Non-cash incentive compensation(4)                                  |  |                                  | 515    |   |                                |   | 532    |      |  |   | 1,662   |   |  |   | 682    |  
|Post-employment expenses (excluding service costs)(5)               |  |                                  | 335    |   |                                |   | 11     |      |  |   | 1,344   |   |  |   | 1,267  |  
|Other adjustments allowable under our existing credit agreements(6) |  |                                  | 357    |   |                                |   | 763    |      |  |   | 602     |   |  |   | 862    |  
|                                                                    |  |                                  |        |   |                                |   |        |      |  |   |         |   |  |   |        |  
|Adjusted EBITDA                                                     |  | $                                | 37,519 |   |                                | $ | 23,195 |      |  | $ | 111,618 |   |  | $ | 66,354 |  
|                                                                    |  |                                  |        |   |                                |   |        |      |  |   |         |   |  |   |        |  





|(1) | Includes the gain on the sale of assets.
|--- | ----------------------------------------

|(2) | Includes fees and expenses related to the January 27, 2012 amendment of our Term Loan and Revolver.
|--- | ---------------------------------------------------------------------------------------------------

|(3) | Includes fees and expense paid to Golden Gate Capital for ongoing consulting and management services provided pursuant to an Advisory Agreement entered into in
connection with the Golden Gate Capital Acquisition; this Advisory Agreement was terminated in connection with our IPO.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(4) | Includes vesting of incentive equity compensation issued to our employees.
|--- | --------------------------------------------------------------------------

|(5) | Includes net pension cost and net post-retirement cost relating to pension and other post-retirement benefit obligations during the applicable period, but in each case
excluding the service cost relating to benefits earned during such period. See Note Q to our Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(6) | Reflects miscellaneous adjustments permitted under our existing credit agreements, including such items as expenses related to reviewing growth initiatives and
potential acquisitions.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Critical Accounting Estimates

Our unaudited condensed consolidated financial statements have been prepared in conformity with GAAP, which requires management to make
estimates and assumptions that affect the reported amount of assets and liabilities at the date of our financial statements and the reported amounts of revenues and expenses during the reporting period. While we do not believe that the reported
amounts would be materially different, application of these policies involves the exercise of judgment and the use of assumptions as to future uncertainties and, as a result, actual results could differ from these estimates. We evaluate our
estimates and judgments on an ongoing basis. We base our estimates on experience and on various other assumptions that are believed to be reasonable under the circumstances. All of our significant accounting policies, including certain critical
accounting policies, are disclosed in our 2011 Annual Report.

Recent Accounting Pronouncements

New accounting guidance that we have recently adopted, as well as accounting guidance that has been recently issued but not yet adopted by
us, are included in Note B to our Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.

Availability of
Reports; Website Access; Other Information

Our internet address is http://www.ussilica.com. Through Investor
Relations  SEC Filings on our home page, we make available free of charge our Annual Report on Form 10-K, our Quarterly Reports on Form 10-Q, our proxy statements, our Current Reports on Form 8-K, SEC Forms 3, 4 and 5 and any
amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC.
Our reports filed with the SEC are also made available to read and copy at the SECs Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549. You may obtain information about the Public Reference Room by contacting the SEC at
1-800-SEC-0330. Reports filed with the SEC are also made available on its website at www.sec.gov.

Copies of our Corporate
Governance Guidelines, our Audit Committee and Compensation and Governance Committee



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charters, the Code of Conduct for our Board of Directors and Code of Conduct and Ethics for U.S. Silica employees (including the chief executive officer, chief financial officer and corporate
controller) can also be found on our website. Any amendments or waivers to the Code of Business Ethics applicable to the chief executive officer, chief financial officer and corporate controller can also be found in the Investor
Relations section of the U.S. Silica website. Stockholders may also request a free copy of these documents from: U.S. Silica Holdings, Inc., attn.: Investor Relations, 8490 Progress Drive, Suite 300, Frederick, Maryland 21701 (phone:
(855) SILICA-7), or IR@ussilica.com.



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|ITEM 3. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
|------- | ----------------------------------------------------------

We are exposed to certain market risks, which exist as a part of our ongoing business operations. We use derivative instruments, where appropriate, to manage these risks. As a matter of policy, we do not
engage in trading or speculative transactions. Refer to Note L to our Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q for further information on our derivative financial instruments.

Interest Rate Risk

We may use interest rate derivatives in the normal course of our business to manage our interest cost and the risks associated with
changing interest rates. These hedge agreements are used to exchange the difference between fixed and variable-rate interest amounts to an agreed-upon notional principal amount. We do not use derivative financial instruments for trading or
speculative purposes. By their nature, all such instruments involve risk, including the possibility that a loss may occur from the failure of another party to perform according to the terms of a contract (credit risk) or the possibility that future
changes in market price may make a financial instrument less valuable or more onerous (market risk). As is customary for these types of instruments, we do not require collateral or other security from other parties to these instruments. In
managements opinion, there is no significant risk of loss in the event of nonperformance of the counterparties to these financial instruments.

The estimated fair value of our derivative assets (interest rate caps) are recorded at each reporting period and are based upon widely accepted valuation techniques, including discounted cash flow
analysis on the expected cash flows of each derivative contract. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied
volatilities. We also incorporate credit valuation adjustments to appropriately reflect both our nonperformance risk as well as that of the respective counterparty in the fair value measurements.

Although we have determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value
hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by us and our counterparties. However, as of September 30,
2012, we have assessed that the impact of the credit valuation adjustments on the overall valuation of our derivative positions is not significant. As a result, we have determined that our derivative valuations in their entirety are classified in
Level 2 of the fair value hierarchy.

The following table summarizes the fair value of our derivative instruments at
September 30, 2012 and December 31, 2011.



|                               |  |              |  |                         |  |                |                   |  |           |   |   |                         |  |   |                |  |  |           |    |  |  |   |    | 
|------------------------------ |  | ------------ |  | ----------------------- |  | -------------- | ----------------- |  | --------- | - | - | ----------------------- |  | - | -------------- |  |  | --------- | -- |  |  | - | -- | 
|                               |  |              |  | September 30, 2012      |  |                | December 31, 2011 | 
|                               |  | MaturityDate |  | Contract/NotionalAmount |  | CarryingAmount |                   |  | FairValue |   |   | Contract/NotionalAmount |  |   | CarryingAmount |  |  | FairValue |   
|Interest rate cap agreement(1) |  | 2012         |  |                         |  |                |                   |  |           |   |   |                         |  | $ | 100 million    |  |  | $         |   |  |  | $ |   | 
|Interest rate cap agreement(1) |  | 2013         |  | $130 million            |  | $              |                  |  |           | $ |  |                         |  | $ | 30 million     |  |  | $         | 11 |  |  | $ | 11 | 



|(1) | Agreements limit the LIBOR floating interest rate base to 4%.
|--- | -------------------------------------------------------------

We have designated these contracts as qualified cash flow hedges. Accordingly, the effective portion of the gain or loss on the
derivative instrument is reported as a component of other comprehensive income and recognized in earnings in the same period or periods during which the hedged transaction affects earnings. We had no ineffective contracts as of September 30,
2012.

A hypothetical increase in interest rates by 1.0% would have changed our interest expense by $0.3 million for the three
months ended September 30, 2012 and $0.9 million for the nine months ended September 30, 2012. A decrease in interest rates would have had no effect on our interest expense as our debt subject to variable interest rates has a floor which
the market rate was below for the duration of the period.

Market Risk

We are exposed to various market risks, including changes in interest rates. Market risk related to interest rates is the potential loss
arising from adverse changes in interest rates. We do not believe that inflation has a material impact on our financial position or results of operations during periods covered by the financial statements included in this Quarterly Report on Form
10-Q.

Credit Risk

We are subject to risks of loss resulting from nonpayment or nonperformance by our customers. We examine the



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creditworthiness of third-party customers to whom we extend credit and manage our exposure to credit risk through credit analysis, credit approval, credit limits and monitoring procedures, and
for certain transactions, we may request letters of credit, prepayments or guarantees, although collateral is generally not required.



|ITEM 4. | CONTROLS AND PROCEDURES
|------- | -----------------------

Evaluation of
Disclosure Controls and Procedures

Our management, with the participation of our chief executive officer and chief
financial officer, evaluated the effectiveness of our disclosure controls and procedures as of September 30, 2012. The term disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act,
means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported,
within the time periods specified in the SECs rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports
that it files or submits under the Exchange Act is accumulated and communicated to the companys management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required
disclosure. Based on the evaluation of our disclosure controls and procedures as of September 30, 2012, our chief executive officer and chief financial officer concluded that, as of such date, our disclosure controls and procedures were
effective at the reasonable assurance level.

Management recognizes that any controls and procedures, no matter how well
designed and operated, can provide only reasonable, and not absolute, assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting identified in managements evaluation pursuant to Rules 13a-15(d) or 15d-15(d) of the Exchange Act during the quarter ended
September 30, 2012 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.



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PART IIOTHER INFORMATION



|ITEM 1. | LEGAL PROCEEDINGS
|------- | -----------------

In
addition to the matter described below, we are subject to various legal proceedings, claims, and governmental inspections, audits or investigations arising out of our business which cover matters such as general commercial, governmental regulations,
antitrust and trade regulations, product liability, environmental, intellectual property, employment and other actions. Although the outcomes of these routine claims cannot be predicted with certainty, in the opinion of management, the ultimate
resolution of these matters will not have a material adverse effect on our financial position or results of operations.

Prolonged inhalation of excessive levels of respirable crystalline silica dust can result in silicosis, a disease of the lungs. Breathing
large amounts of respirable silica dust over time may injure a persons lungs by causing scar tissue to form. Crystalline silica in the form of quartz is a basic component of soil, sand, granite and most other types of rock. Cutting, breaking,
crushing, drilling, grinding and abrasive blasting of or with crystalline silica containing materials can produce fine silica dust, the inhalation of which may cause silicosis, lung cancer and possibly other diseases including immune system
disorders such as scleroderma. Sources of exposure to respirable crystalline silica dust include sandblasting, foundry manufacturing, crushing and drilling of rock, masonry and concrete work, mining and tunneling, and cement and asphalt pavement
manufacturing.

Since at least 1975, we and/or our predecessors have been named as a defendant, usually among many defendants,
in numerous lawsuits brought by or on behalf of current or former employees of our customers alleging damages caused by silica exposure. Prior to 2001, the number of silicosis lawsuits filed annually against the commercial silica industry remained
relatively stable and was generally below 100, but between 2001 and 2004 the number of silicosis lawsuits filed against the commercial silica industry substantially increased. This increase led to greater scrutiny of the nature of the claims filed,
and in June 2005 the U.S. District Court for the Southern District of Texas issued an opinion in the former federal silica multi-district litigation remanding almost all of the 10,000 cases then pending in the multi-district litigation back to the
state courts from which they originated for further review and medical qualification, leading to a number of silicosis case dismissals across the United States. In conjunction with this and other favorable court rulings establishing
sophisticated user and no duty to warn defenses for silica producers, several states, including Texas, Ohio and Florida, have passed medical criteria legislation that requires proof of actual impairment before a lawsuit can
be filed.

As a result of the above developments, the filing rate of new claims against us over the past three years has
decreased to below pre-2001 levels, and we were named as a defendant in two, ten and three new silicosis cases filed in 2009, 2010 and 2011, respectively. During the first nine months of 2012, one additional claim was brought against us. As of
November 2, 2012, there are a total of approximately 104 active silica-related products liability claims pending in which we were a defendant and approximately 3,152 inactive claims. Almost all of the claims pending against us arise out of the
alleged use of our silica products in foundries or as an abrasive blast media, and involve various other defendants. We have insurance policies and an indemnity from a former owner that cover certain claims for alleged silica exposure for periods
prior to certain dates in 1985 (with respect to the indemnity and certain insurance) and 1986 (with respect to the balance of the insurance). Although the scope of coverage under those policies is currently being litigated, we believe, based on
currently available information, they and the indemnity will remain in force.

The silica-related litigation brought against
us to date has not resulted in material liability to us. However, we continue to have silica-related products liability claims filed against us, including claims that allege silica exposure for periods for which we have neither insurance nor
indemnity coverage. Any such pending or future claims or inadequacies of our insurance coverage or indemnity could have a material adverse effect on our business, reputation or results of operations. For more information regarding silica-related
litigation, see Part I, Item 1A of 2011 Annual Report Risk FactorsRisks Related to Our BusinessSilica-related health issues and litigation could have a material adverse effect on our business, reputation or results of
operations.



|ITEM 1A. | RISK FACTORS
|-------- | ------------

As of
September 30, 2012, there have been no material changes to the risk factors disclosed in Item 1A of Part 1 in our 2011 Annual Report.



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|ITEM 2. | UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS
|------- | -----------------------------------------------------------

Share Repurchase Program

Information required by this item is set forth in
Part I Item 2 of this Quarterly Report on Form 10-Q under the caption Liquidity and Capital Resources  Share Repurchase Program and is incorporated herein by reference.



|ITEM 3. | DEFAULTS UPON SENIOR SECURITIES
|------- | -------------------------------

None.



|ITEM 4. | MINE SAFETY DISCLOSURES
|------- | -----------------------

Safety is one of our core values, and we strive for excellence in the achievement of a workplace free of injuries and occupational
illnesses. Our health and safety leadership team has developed comprehensive safety policies and standards, which include detailed standards and procedures for safe production, addresses topics such as employee training, risk management, workplace
inspection, emergency response, accident investigation and program auditing. We place special emphasis on the importance of continuous improvement in occupational health, personal injury avoidance and prevention, emergency preparedness, and property
damage elimination. In addition to strong leadership and involvement from all levels of the organization, these programs and procedures form the cornerstone of our safety initiatives, ensuring that employees are provided a safe and healthy
environment and are intended as a means to reduce workplace accidents, incidents and losses, comply with all mining-related regulations and provide support for both regulators and the industry to improve mine safety. While we want to have productive
operations in full regulatory compliance, we know it is equally essential that we motivate and train our people to think, practice and feel a personal responsibility for health and safety on and off the job.

All of our production facilities are classified as mines and are subject to regulation by the Federal Mine Safety and Health
Administration (MSHA) under the Federal Mine Safety and Health Act of 1977 (the Mine Act). MSHA inspects our mines on a regular basis and issues various citations and orders when it believes a violation has occurred under the
Mine Act. Following passage of The Mine Improvement and New Emergency Response Act of 2006, MSHA significantly increased the numbers of citations and orders charged against mining operations. The dollar penalties assessed for citations issued has
also increased in recent years. Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K (17 CFR
229.104) is included in Exhibit 95.1 to this Quarterly Report filed on Form 10-Q.



|ITEM 5. | OTHER INFORMATION
|------- | -----------------

None.



|ITEM 6. | EXHIBITS
|------- | --------

The information
called for by this Item is incorporated herein by reference from the Exhibit Index included in this Quarterly Report on Form 10-Q.



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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized, this 2nd day of November, 2012.



U.S. Silica Holdings, Inc./s/ WILLIAM A. WHITEName:

William A. WhiteTitle:

Chief Financial Officer
(Principal Financial Officer)




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##### Table of Contents

EXHIBIT INDEX



|              |  |                                                                                                                                                                                                                                              |  |                           |  |            |  |         |  |                 
|------------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------- |  | ---------- |  | ------- |  | ----------------
|              |  |                                                                                                                                                                                                                                              |  | Incorporated by
Reference
|ExhibitNumber |  | Description                                                                                                                                                                                                                                  |  | Form                      |  | File No.   |  | Exhibit |  | Filing Date     
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|3.1           |  | Second Amended and Restated Certificate of Incorporation of U.S. Silica Holdings, Inc., effective January 31, 2012.                                                                                                                          |  | 8-K                       |  | 001-35416  |  | 3.1     |  | February 6, 2012
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|3.2           |  | Second Amended and Restated Bylaws of U.S. Silica Holdings, Inc., effective January 31, 2012.                                                                                                                                                |  | 8-K                       |  | 001-35416  |  | 3.2     |  | February 6, 2012
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|4.1           |  | Specimen Common Stock Certificate.                                                                                                                                                                                                           |  | S-1/A                     |  | 333-175636 |  | 4.1     |  | December 7, 2011
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|4.2           |  | Registration Rights Agreement, dated January 31, 2012, by and between U.S. Silica Holdings, Inc. and GGC USS Holdings, LLC.                                                                                                                  |  | 8-K                       |  | 001-35416  |  | 4.2     |  | February 6, 2012
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|31.1*         |  | Rule 13a-14(a)/15(d)-14(a) Certification by Bryan A. Shinn, Chief Executive Officer.                                                                                                                                                         |  |                           |  |            |  |         |  |                 
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|31.2*         |  | Rule 13a-14(a)/15(d)-14(a) Certification by William A. White, Chief Financial Officer.                                                                                                                                                       |  |                           |  |            |  |         |  |                 
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|32.1*         |  | Section 1350 Certification by Bryan A. Shinn, Chief Executive Officer.                                                                                                                                                                       |  |                           |  |            |  |         |  |                 
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|32.2*         |  | Section 1350 Certification by William A. White, Chief Financial Officer.                                                                                                                                                                     |  |                           |  |            |  |         |  |                 
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|95.1*         |  | Mine Safety Disclosure                                                                                                                                                                                                                       |  |                           |  |            |  |         |  |                 
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|99.1*         |  | Consent of The Freedonia Group, Inc.                                                                                                                                                                                                         |  |                           |  |            |  |         |  |                 
|              |  |                                                                                                                                                                                                                                              |  |                           | 
|101*          |  | 101.INS XBRL Instance 
101.SCH XBRL Taxonomy Extension Schema 
101.CAL XBRL Taxonomy Extension Calculation 
101.LAB XBRL Taxonomy Extension Labels 
101.PRE XBRL Taxonomy Extension Presentation 
101.DEF XBRL Taxonomy Extension Definition |  |                           |  |            |  |         |  |                 



|* | Filed herewith
|- | --------------

We will furnish any of our
shareowners a copy of any of the above Exhibits not included herein upon the written request of such shareowner and the payment to U.S. Silica Holdings, Inc. of the reasonable expenses incurred in furnishing such copy or copies.



E-1