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10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q



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

For the Quarterly Period Ended September 30, 2015



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

Commission file number 001-35416

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 ý 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 ý 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.

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

As of October 26, 2015, 53,384,160 shares of common stock, par value $0.01 per share, of the registrant were outstanding.

U.S. Silica Holdings, Inc.

FORM 10-Q

For the Quarter Ended September 30, 2015

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 Stockholders’ Equity	5
	Condensed Consolidated Statements of Cash Flows	6
	Notes to Condensed Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	17
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	30
Item 4.	Controls and Procedures	31

PART II	Other Information:
Item 1.	Legal Proceedings	32
Item 1A.	Risk Factors	32
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	33
Item 3.	Defaults Upon Senior Securities	33
Item 4.	Mine Safety Disclosures	33
Item 5.	Other Information	34
Item 6.	Exhibits	35
Signatures		S-1

PART I—FINANCIAL INFORMATION



ITEM 1.	FINANCIAL STATEMENTS

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(dollars in thousands)



	September 30, 2015			December 31, 2014
	(unaudited)			(audited)
ASSETS
Current Assets:
Cash and cash equivalents	$	253,765		$	267,281
Short-term investments	46,007			75,143
Accounts receivable, net	85,605			120,881
Inventories, net	70,671			66,712
Prepaid expenses and other current assets	12,516			9,267
Deferred income taxes, net	8,925			22,295
Income tax deposits	6,260			746
Total current assets	483,749			562,325
Property, plant and mine development, net	563,262			565,755
Goodwill	68,647			68,647
Trade names	14,914			14,914
Customer relationships, net	6,577			6,984
Other assets	19,444			12,317
Total assets	$	1,156,593		$	1,230,942
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities:
Book overdraft	$	2,405		$	4,215
Accounts payable	57,982			85,781
Dividends payable	6,772			6,805
Accrued liabilities	14,055			17,911
Accrued interest	58			60
Current portion of long-term debt	3,327			3,329
Deferred revenue	14,022			26,771
Total current liabilities	98,621			144,872
Long-term debt	489,208			491,757
Deferred revenue	64,759			64,722
Liability for pension and other post-retirement benefits	60,099			59,932
Deferred income taxes, net	28,124			49,749
Other long-term obligations	18,115			16,094
Total liabilities	758,926			827,126
Stockholders’ Equity:
Common stock	539			539
Additional paid-in capital	192,915			191,086
Retained earnings	239,655			232,551
Treasury stock, at cost	(15,960		)	(542		)
Accumulated other comprehensive loss	(19,482		)	(19,818		)
Total stockholders’ equity	397,667			403,816
Total liabilities and stockholders’ equity	$	1,156,593		$	1,230,942

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

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

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



	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Sales	$	155,408		$	241,256		$	506,877		$	627,152
Cost of goods sold (excluding depreciation, depletion and amortization)	122,599			149,697			378,452			408,884
Operating expenses
Selling, general and administrative	13,559			18,600			47,095			53,312
Depreciation, depletion and amortization	15,158			12,425			42,096			32,355
	28,717			31,025			89,191			85,667
Operating income	4,092			60,534			39,234			132,601
Other income/(expense)
Interest expense	(6,684		)	(4,950		)	(20,448		)	(12,771		)
Other income, net, including interest income	309			120			818			379
	(6,375		)	(4,830		)	(19,630		)	(12,392		)
Income/(loss) before income taxes	(2,283		)	55,704			19,604			120,209
Income tax benefit/(expense)	4,695			(14,427		)	7,584			(31,907		)
Net income	$	2,412		$	41,277		$	27,188		$	88,302
Earnings per share:
Basic	$	0.05		$	0.77		$	0.51		$	1.64
Diluted	$	0.04		$	0.76		$	0.51		$	1.63
Weighted average shares outstanding:
Basic	53,321			53,801			53,386			53,679
Diluted	53,742			54,393			53,831			54,265
Dividends declared per share	$	0.13		$	0.13		$	0.38		$	0.38

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

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(unaudited; dollars in thousands)



	Three Months Ended September 30,					Nine Months Ended September 30,
	2015			2014		2015		2014
Net income	$	2,412		$	41,277	$	27,188	$	88,302
Other comprehensive income/(loss):
Unrealized gain (loss) on derivatives (net of tax of $10 and $1 for the three months ended September 30, 2015 and 2014, respectively, and $18 and ($33) for the nine months ended September 30, 2015 and 2014, respectively)	17			1		29		(52		)
Unrealized gain on investments (net of tax of $3 and $2 for the three months ended September 30, 2015 and 2014, respectively, and $33 and $16 for the nine months ended September 30, 2015 and 2014, respectively)	4			2		53		25
Pension and other post-retirement benefits liability adjustment (net of tax of ($2,431) and $95 for the three months ended September 30, 2015 and 2014, respectively, and $157 and $285 for the nine months ended September 30, 2015 and 2014, respectively)	(3,924		)	149		254		447
Comprehensive income/(loss)	$	(1,491	)	$	41,429	$	27,524	$	88,722

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

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(unaudited; dollars in thousands)



	Common Stock		Treasury Stock			Additional Paid-In Capital			Retained Earnings (Deficit)			Accumulated Other Comprehensive Income (Loss)			Total Stockholders’ Equity
Balance at December 31, 2014	$	539	$	(542	)	$	191,086		$	232,551		$	(19,818	)	$	403,816
Net income	—		—			—			27,188			—			27,188
Unrealized gain on derivatives	—		—			—			—			29			29
Unrealized gain on short-term investments	—		—			—			—			53			53
Pension and post-retirement liability	—		—			—			—			254			254
Cash dividend declared ($0.375 per share)	—		—			—			(20,084		)	—			(20,084		)
Common stock-based compensation plans activity:
Equity-based compensation	—		—			1,824			—			—			1,824
Excess tax benefit from equity compensation	—		—			225			—			—			225
Proceeds from options exercised	—		583			(219		)	—			—			364
Shares withheld for employee taxes related to vested restricted stock and stock units	—		(746		)	(1		)	—			—			(747		)
Repurchase of common stock	—		(15,255		)	—			—			—			(15,255		)
Balance at September 30, 2015	$	539	$	(15,960	)	$	192,915		$	239,655		$	(19,482	)	$	397,667

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

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited; dollars in thousands)



	Nine Months Ended September 30,
	2015			2014
Operating activities:
Net income	$	27,188		$	88,302
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	42,096			32,355
Debt issuance amortization	1,054			657
Original issue discount amortization	288			197
Deferred income taxes	(8,463		)	4,043
Deferred revenue	(12,712		)	(3,669		)
Loss on disposal of property, plant and equipment	1,007			134
Equity-based compensation	1,824			4,807
Excess tax benefit from equity-based compensation	(225		)	(3,673		)
Other	(8,773		)	3,433
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	36,587			(49,664		)
Inventories	(3,959		)	2,104
Prepaid expenses and other current assets	(3,303		)	(1,378		)
Income taxes	(5,514		)	(84		)
Accounts payable and accrued liabilities	(31,655		)	32,214
Accrued interest	(2		)	(5		)
Liability for pension and other post-retirement benefits	978			(2,786		)
Net cash provided by operating activities	36,416			106,987
Investing activities:
Capital expenditures	(38,167		)	(51,576		)
Proceeds from sales and maturities of short-term investments	29,388			—
Acquisition of business, net of cash acquired	—			(98,317		)
Proceeds from sale of property, plant and equipment	77			13
Net cash used in investing activities	(8,702		)	(149,880		)
Financing activities:
Dividends paid	(20,117		)	(20,132		)
Repurchase of common stock	(15,255		)	—
Proceeds from options exercised	364			5,433
Excess tax benefit from equity-based compensation	225			3,673
Tax payments related to shares withheld for vested restricted stock	(747		)	(572		)
Advances from customers	—			100,000
Repayment of long-term debt	(3,826		)	(2,812		)
Change in book overdraft	(1,810		)	887
Principal payments on capital lease obligations	—			(132		)
Financing fees	(64		)	—
Net cash provided by/(used in) financing activities	(41,230		)	86,345
Net increase/(decrease) in cash and cash equivalents	(13,516		)	43,452
Cash and cash equivalents, beginning of period	267,281			78,256
Cash and cash equivalents, end of period	$	253,765		$	121,708
Supplemental cash flow information:
Cash paid during the period for:
Interest	$	16,359		$	11,545
Taxes	$	6,176		$	28,204

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

U.S. SILICA HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

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

NOTE A—SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation and Consolidation

The accompanying Condensed Consolidated Financial Statements (the “Financial Statements”) of U.S. Silica Holdings, Inc. (“Holdings,” and together with its subsidiaries “we,” “us” or the “Company”) included in this Quarterly Report on Form 10-Q, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X issued by the U.S. Securities and Exchange Commission (“SEC”). They do not contain certain information included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014; therefore, the interim Condensed Consolidated Financial Statements should be read in conjunction with that Annual Report on Form 10-K. In the opinion of management, all adjustments necessary for a fair presentation of the Financial Statements have been included. Such adjustments are of a normal, recurring nature. We have reclassified certain immaterial amounts in the prior years’ assets section of the consolidated balance sheets and operating activities section of the consolidated statement of cash flows to conform to the current year presentation. These reclassifications had no effect on previously reported total assets and net cash flows from operations.

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

Unaudited Interim Financial Statements

The accompanying Balance Sheet as of September 30, 2015; the Income Statements for the three and nine months ended September 30, 2015 and 2014; the Condensed Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2015 and 2014; the Condensed Consolidated Statements of Stockholders' Equity for the nine months ended September 30, 2015; the Cash Flows for the nine months ended September 30, 2015 and 2014; and other information disclosed in the related notes are unaudited. The Balance Sheet as of December 31, 2014 was derived from our audited consolidated financial statements as included in our 2014 Annual Report.

Use of Estimates and Assumptions

The preparation of the Financial Statements requires us 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 allowance for doubtful accounts; 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; equity-based compensation expense; 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. We base our 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.

Recently Issued Accounting Pronouncements

In April 2015, the Financial Accounting Standards Board ("FASB") issued an Accounting Standards Update, Interest-Imputation of Interest, which simplifies presentation of debt issuance costs. The new standard requires that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The new standard will be effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within fiscal years beginning after December 15, 2016. Early adoption of the amendments in this Update is permitted for financial statements that have not been previously issued. We have elected to adopt the standard early and have presented debt issuance costs as a direct deduction from the carrying amount of debt on our Balance Sheets as of September 30, 2015 and December 31, 2014.

On July 22, 2015, the FASB issued Accounting Standards Update, Simplifying the Measurement of Inventory. The new standard requires an entity to measure most inventory at the lower of cost and net realizable value, thereby simplifying the

current guidance under which an entity must measure inventory at the lower of cost or market. The new standard will not apply to inventories that are measured using either the last-in, first-out (LIFO) method or the retail inventory method. This Update is effective for public entities for financial statements issued for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years; early application is permitted. We are currently evaluating the effect that the new guidance will have on our financial statements and related disclosures.

NOTE B—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 Holdings shall be vested in the holders of the common stock. There were 53,386,174 shares of common stock issued and outstanding at September 30, 2015. As of September 30, 2014, there were 53,902,295 shares issued and outstanding.

In 2015, our Board of Directors declared quarterly cash dividends as follows:



Dividends per Common Share		Declaration Date	Record Date	Payable Date
$	0.125	February 12, 2015	March 16, 2015	April 3, 2015
$	0.125	May 8, 2015	June 15, 2015	July 6, 2015
$	0.125	July 24, 2015	September 15, 2015	October 2, 2015

All dividends were paid as scheduled.

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 may be 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, to fix the powers, preferences and other rights of such series, and any 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, 2015. At present, we have no plans to issue any preferred stock.

Employee Stock Awards

We grant stock options, restricted stock, restricted stock units and performance share units to our employees and directors under the Amended and Restated U.S. Silica Holdings, Inc. 2011 Incentive Compensation Plan. The weighted-average stock options that are antidilutive and are therefore excluded from the calculation of our diluted earnings per common share are:



	Three Months Ended September 30,		Nine Months Ended September 30,
	2015	2014	2015	2014
Weighted-average outstanding stock options excluded	726	—	464	—

Share Repurchase Program

We are authorized by our Board of Directors to repurchase shares of our outstanding common stock from time to time on the open market or in privately negotiated transactions. As of September 30, 2015, we are authorized to repurchase up to $50 million of our common stock through December 11, 2015. Stock repurchases, if any, will be funded using our available liquidity. 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. Under our share repurchase program, as of September 30, 2015, we have

repurchased 706,093 shares of our common stock at an average price of $23.83 and are authorized to repurchase up to an additional $33.2 million of our common stock.

Accumulated Other Comprehensive Income

Accumulated other 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. The following table presents the changes in accumulated other comprehensive income by component during the nine months ended September 30, 2015:



	For the Nine Months Ended September 30, 2015
	Unrealized gain/(loss) on cash flow hedges			Unrealized gain/(loss) on short-term investments			Pension and other post-retirement benefits liability			Total
Beginning Balance	$	(134	)	$	(41	)	$	(19,643	)	$	(19,818	)
Other comprehensive income (loss) before reclassifications	(3		)	53			(1,127		)	(1,077		)
Amounts reclassed from accumulated other comprehensive income	32			—			1,381			1,413
Ending Balance	$	(105	)	$	12		$	(19,389	)	$	(19,482	)

Amounts reclassified from accumulated other comprehensive income (loss) related to cash flow hedges category are included in interest expense in our Income Statements and amounts reclassified related to pension and other post-retirement benefits liability category are included in the computation of net periodic pension costs, respectively, at before tax amounts.

NOTE C—BUSINESS COMBINATIONS

On July 31, 2014, we completed our acquisition of Cadre Services, Inc. ("Cadre"), a regional sand mining company based in Voca, Texas, for approximately $98.3 million in cash.

The acquisition of Cadre resulted in goodwill of approximately $0.2 million, none of which is deductible for tax purposes. This amount represents the residual amount of the total purchase price after allocation to the assets acquired and liabilities assumed.

The table below represents the tangible and identifiable intangible assets and liabilities based on management’s assessment of the acquisition date fair value of the assets acquired and liabilities assumed:



Accounts receivable	$	6,898
Inventory	2,534
Other current assets	174
Fixed assets	73,138
Deferred tax assets (net)	13,966
Accounts payable, accrued expenses and other liabilities	(4,389		)
Net tangible assets acquired	92,321
Customer relationships	1,274
Trade name	4,478
Goodwill	244
Purchase price, net of cash acquired	$	98,317

The value of acquired intangible assets and the related estimated useful lives consist of the following:



	Estimated Useful Lives	Value
Customer relationships	15 years	$	1,274
Trade name	Indefinite	4,478
Total intangible assets		$	5,752

Pro Forma Adjusted Summary

The results of Cadre’s operations have been included in the consolidated financial statements subsequent to the acquisition date.

The following unaudited pro forma consolidated financial information reflects the results of operations as if the Cadre acquisition had occurred on January 1, 2014, after giving effect to certain purchase accounting adjustments. This information does not purport to be indicative of the actual results that would have occurred if the acquisition had actually been completed on the date indicated, nor is it necessarily indicative of the future operating results or the financial position of the combined company:



	Three Months Ended September 30, 2014		Nine Months Ended September 30, 2014
Sales	$	245,625	$	652,288
Net income	42,466		92,349
Basic earnings per share	$	0.79	$	1.72
Diluted earnings per share	0.78		1.70

NOTE D—ACCOUNTS RECEIVABLE

At September 30, 2015 and December 31, 2014, accounts receivable consisted of the following:



	September 30, 2015			December 31, 2014
Trade receivables	$	93,404		$	128,498
Less: Allowance for doubtful accounts	(9,118		)	(10,429		)
Net trade receivables	84,286			118,069
Other receivables	1,319			2,812
Total accounts receivable	$	85,605		$	120,881

Changes in our allowance for doubtful accounts during the nine months ended September 30, 2015 are as follows:



	September 30, 2015
Beginning balance	$	10,429
Bad debt provision	(211		)
Write-offs	(1,100		)
Ending balance	$	9,118

NOTE E—INVENTORIES

At September 30, 2015 and December 31, 2014, inventories consisted of the following:



	September 30, 2015		December 31, 2014
Supplies	$	18,877	$	17,528
Raw materials and work in process	18,036		12,562
Finished goods	33,758		36,622
Total inventories	$	70,671	$	66,712

NOTE F—PROPERTY, PLANT AND MINE DEVELOPMENT

At September 30, 2015 and December 31, 2014, property, plant and mine development consisted of the following:



	September 30, 2015			December 31, 2014
Mining property and mine development	$	222,611		$	197,824
Asset retirement cost	10,971			9,559
Land	30,322			28,443
Land improvements	37,058			35,322
Buildings	51,280			47,149
Machinery and equipment	359,792			323,618
Furniture and fixtures	1,647			1,599
Construction-in-progress	47,128			78,997
	760,809			722,511
Accumulated depletion, depreciation and amortization	(197,547		)	(156,756		)
Total property, plant and mine development, net	$	563,262		$	565,755

The amount of interest costs capitalized in property, plant and mine development was $465 and $890 for the nine months ended September 30, 2015 and 2014, respectively.

NOTE G—DEBT

At September 30, 2015 and December 31, 2014, debt consisted of the following:



	September 30, 2015			December 31, 2014
Senior secured credit facility:
Revolver expiring July 23, 2018 (4.75% at September 30, 2015 and 4.75% at December 31, 2014)	$	—		$	—
Term loan facility—final maturity July 23, 2020 (4% - 4.5% at September 30, 2015 and 4% - 5.25% at December 31, 2014)	500,550			504,375
Less: Unamortized original issue discount	(1,792		)	(2,078		)
Less: Unamortized debt issuance cost	(6,223		)	(7,211		)
Total debt	492,535			495,086
Less: current portion	(3,327		)	(3,329		)
Total long-term portion of debt	$	489,208		$	491,757

Revolving Line-of-Credit

We have a $50 million revolving line-of-credit (the “Revolver”), with zero drawn and $3.1 million allocated for letters of credit as of September 30, 2015, leaving $46.9 million available under the Revolver.

Debt Maturities

At September 30, 2015, contractual maturities of long-term debt are as follows:



2015	$	1,275
2016	5,100
2017	5,100
2018	5,100
2019	5,100
Thereafter	478,875
	$	500,550

Our senior secured credit facility is secured by substantially all of our assets and a pledge of the equity interests in certain of our subsidiaries. The facility contains covenants that, among other things, govern our ability to create, incur or assume indebtedness and liens, to make acquisitions or investments, to pay dividends and to sell assets. The facility also

requires us to maintain a consolidated total net leverage ratio of no more than 3.75:1.00 as of the last day of any fiscal quarter whenever usage of the Revolver (other than certain undrawn letters of credit) exceeds 25% of the Revolver commitment. As of September 30, 2015, we are in compliance with all covenants in accordance with our senior secured credit facility.

NOTE H—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, 2015, we had a liability of $13.3 million in other long-term obligations related to our asset retirement obligation. Changes in the asset retirement obligation during the nine months ended September 30, 2015 are as follows:



	September 30, 2015
Beginning balance	$	11,283
Payments	—
Accretion	601
Additions and revisions of prior estimates	1,412
Ending balance	$	13,296

NOTE I—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. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3—Inputs that are generally unobservable and typically reflect management’s estimate of assumptions that market participants would use in pricing the asset or liability.

Cash Equivalents

Due to the short-term maturity, we believe our cash equivalent instruments at September 30, 2015 and December 31, 2014 approximate their reported carrying values.

Short-Term Investments

In general, the fair value of our short-term investments is based on quoted prices for similar assets in active markets, or for identical assets or similar assets in markets in which there were fewer transactions (Level 2). Money market mutual funds are based on calculated net asset value and are reported in Level 1. Variable rate demand obligations underwritten and remarketed by a financial institution are priced at par value.

Long-Term Debt, Including Current Maturities

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

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 of ourselves and our counterparties. However, as of September 30, 2015, 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, 2015 of those assets that we measure at fair value on a recurring basis:



	Level 1		Level 2		Total
Short-term investments	$	2	$	46,005	$	46,007
Interest rate derivatives	—		—		—
Net asset	$	2	$	46,005	$	46,007

NOTE J—SHORT-TERM INVESTMENTS

We have segregated funds into designated accounts with investment brokers who manage our short-term investment portfolio. Those funds are held on an available-for-sale basis and are therefore reported at fair value on the balance sheet. The following table summarizes our available-for-sale short-term investments as of September 30, 2015:



	Aggregate Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Money market mutual funds	$	2	$	—	$	—		$	2
Fixed income securities:
Certificates of deposit	16,400		8		—			16,408
Commercial paper	10,174		29		—			10,203
Corporate notes and bonds	8,972		—		(31		)	8,941
Government agencies	8,301		5		(1		)	8,305
U.S. Treasuries	2,149		—		(1		)	2,148
Total available-for-sale investments	$	45,998	$	42	$	(33	)	$	46,007

As of September 30, 2015, we considered any declines in market value of our short-term investment portfolio to be temporary in nature and did not consider any of our investments other-than-temporarily impaired. We typically invest in highly-rated securities, and our investment policy generally limits the amount of credit exposure to any one issuer. The policy requires investments generally to be investment grade, with the primary objective of minimizing the potential risk of principal loss. Fair values were determined for each individual security in the investment portfolio. When evaluating an investment for other-than-temporary impairment, we review factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, changes in market interest rates, and our intent to sell, or whether it is more likely than not it will be required to sell, the investment before recovery of the investment’s cost basis. As of September 30, 2015, we did not recognize any impairment charges.

NOTE K—COMMITMENTS AND CONTINGENCIES

Future Minimum Annual Commitments at September 30, 2015:



	Operating Leases		Minimum Purchase Commitments
2015	$	11,500	$	9,909
2016	44,436		31,834
2017	55,742		20,852
2018	59,040		16,664
2019	53,549		11,717
Thereafter	180,823		16,921
Total future lease and purchase commitments	$	405,090	$	107,897

Operating Leases

We are obligated under certain operating leases for railroad cars, office space, mining property, mining/processing equipment and transportation and other equipment. Certain operating lease agreements include options to purchase the equipment for fair market value at the end of the original lease term. In general, the above leases include renewal options and provide that we pay for all utilities, insurance, taxes and maintenance. Expense related to operating leases and rental agreements totaled approximately $13.2 million and $8.1 million for the three months ended September 30, 2015 and 2014, respectively, and $34.9 million and $23.4 million for the nine months ended September 30, 2015 and 2014, respectively. As of September 30, 2015, we have no obligations under a capital lease.

Minimum Purchase Commitments

We enter into service agreements with our transload service providers and transportation service providers. Some of these agreements require us to purchase a minimum amount of services over a specific period of time. Any inability to meet these minimum contract requirements requires us to pay a shortfall fee, which is based on the difference between the minimum amount contracted for and the actual amount purchased.

Other Commitments and Contingencies

Our operating subsidiary, U.S. Silica Company (“U.S. Silica”), has been named as a defendant in various product liability claims alleging silica exposure causing silicosis. During the three months ended September 30, 2015, no new claims were brought against U.S. Silica. As of September 30, 2015, there were 75 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, it is not reasonably possible that the ultimate resolution of these matters will have a material adverse effect on our financial position or results of operations that exceeds the accrual amounts.

For periods prior to 1986, U.S. Silica had numerous insurance policies and an indemnity from a former owner that covered silicosis claims. In the fourth quarter of 2012, U.S. Silica settled all rights under the indemnity and its underlying insurance. The settlement was received during the first quarter of 2013. As a result of the settlement, the indemnity and related policies are no longer available to U.S. Silica and U.S. Silica will not seek reimbursement for any defense costs or claim payments. Other insurance policies, however, continue to remain available to U.S. Silica.

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 consolidated balance sheets. As of both September 30, 2015, and December 31, 2014 other non-current assets included $0.3 million for insurance for third-party products liability claims and other long-term obligations included $1.3 million in third-party products claims liability.

Additionally, during the three months ended March 31, 2015, we received an unfavorable ruling in an arbitration proceeding as a result of exiting a toll manufacturing contract. The amount of the ruling was approximately $7.6 million. The matter was settled and the settlement amount of $6.5 million was paid on June 9, 2015, which was included in selling, general and administrative expense in our Income Statement for the nine months ended September 30, 2015.

NOTE L—INCOME TAXES

For interim period reporting, we record income taxes using an estimated annual effective tax rate based upon projected annual income, forecasted permanent tax differences, discrete items and statutory rates in states in which we operate. At the end of each interim period, we update the estimated annual effective tax rate, and if the estimated tax rate changes based on new information, we make a cumulative adjustment in the period. We record the tax effect of an unusual or infrequently occurring item in the interim period in which it occurs as a discrete item of tax.

In the nine months ended September 30, 2015, we recorded a discrete tax benefit of $2.9 million, which relates to the arbitration ruling described in Note K - Commitments and Contingencies.

The effective tax rate was (39)% and 27% for nine months ended September 30, 2015 and 2014, respectively. The tax rate for the nine months ending September 30, 2015 would have been (24)% without the discrete tax benefit.

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. The deduction for statutory percentage depletion does not necessarily change proportionately to changes in income before income taxes.

NOTE M—PENSION AND POST-RETIREMENT BENEFITS

We maintain a single-employer noncontributory defined benefit pension plan covering certain employees. Net pension benefit cost recognized for the three and nine months ended September 30, 2015 and 2014 are as follows:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Service cost	$	324		$	269		$	971		$	808
Interest cost	1,203			1,143			3,610			3,428
Expected return on plan assets	(1,375		)	(1,255		)	(4,124		)	(3,765		)
Net amortization and deferral	666			237			1,999			713
Net pension benefit costs	$	818		$	394		$	2,456		$	1,184

In addition, we provide defined benefit post-retirement health care and life insurance benefits to some employees. Net periodic post-retirement benefit cost recognized for the three and nine months ended September 30, 2015 and 2014 are as follows:



	Three Months Ended September 30,					Nine Months Ended September 30,
	2015		2014			2015			2014
Service cost	$	36	$	45		$	124		$	135
Interest cost	221		256			776			770
Expected return on plan assets	—		(1		)	(2		)	(3		)
Special termination benefit	47		—			47			—
Net amortization and deferral	58		—			250			—
Net post-retirement costs	$	362	$	300		$	1,195		$	902

The weighted average discount rate used to determine the projected pension and post-retirement obligations was updated during the nine months ended September 30, 2015, and was increased from 4.1% at December 31, 2014 to 4.3% at September 30, 2015. We contributed $1.8 million and $2.0 million to the qualified pension plan for the three months ended September 30, 2015 and 2014, respectively. We contributed $2.0 million and $4.6 million to the qualified pension plan during the nine months ended September 30, 2015 and 2014, respectively. Total expected employer funding contributions during the fiscal year ending December 31, 2015 are $2.0 million for the pension plan and $1.6 million for the post-retirement medical and life plan.

NOTE N—OBLIGATIONS UNDER GUARANTEES

We have indemnified Travelers Casualty and Surety Company of America (“Travelers”) against any loss Travelers may incur in the event that holders of surety bonds, issued on behalf of us by Travelers, execute the bonds. As of September 30, 2015, Travelers had $9.9 million in bonds outstanding for us. The majority of these bonds, $9.5 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.

NOTE O—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.

In the Oil & Gas Proppants segment, we serve the oil and gas recovery market by 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 oil and natural gas from the wells.

The Industrial & Specialty Products segment consists of over 260 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.

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 Note A - Summary of Significant Accounting Policies of our Financial Statements.

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, 2015 and 2014:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Sales:
Oil & Gas Proppants	$	101,987		$	186,812		$	341,593		$	466,727
Industrial & Specialty Products	53,421			54,444			165,284			160,425
Total Sales	155,408			241,256			506,877			627,152
Segment contribution margin:
Oil & Gas Proppants	16,521			77,030			81,972			175,718
Industrial & Specialty Products	19,967			16,844			54,953			47,646
Total segment contribution margin	36,488			93,874			136,925			223,364
Operating activities excluded from segment cost of goods sold	(3,679		)	(2,315		)	(8,500		)	(5,096		)
Selling, general and administrative	(13,559		)	(18,600		)	(47,095		)	(53,312		)
Depreciation, depletion and amortization	(15,158		)	(12,425		)	(42,096		)	(32,355		)
Interest expense	(6,684		)	(4,950		)	(20,448		)	(12,771		)
Other income, net, including interest income	309			120			818			379
Income/(loss) before income taxes	$	(2,283	)	$	55,704		$	19,604		$	120,209

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. Goodwill of $68.6 million has been allocated to these segments with $47.9 million assigned to Oil & Gas Proppants and $20.7 million to Industrial & Specialty Products.

NOTE P—SUBSEQUENT EVENTS

On October 2, 2015, we paid a cash dividend of $0.125 per share to common stockholders of record on September 15, 2015, which had been declared by our Board of Directors on July 24, 2015.



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 and the accompanying notes included in Part I, Item 1 of this Quarterly Report on Form 10-Q as well as the Consolidated Financial Statements, the accompanying notes and the related Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”), contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2014 (the "2014 Annual Report").

Overview

We are one of the largest domestic producers of commercial silica, a specialized mineral that is a critical input into a variety of attractive end markets. During our 115 year history, we have developed core competencies in mining, processing, logistics and materials science that enable us to produce and cost-effectively deliver over 260 products to customers across these markets. As of September 30, 2015, we operate 17 production facilities across the United States and control 364 million tons of reserves of commercial silica. We own one of the largest frac sand processing plants in the United States and control approximately 181 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

Oil and gas proppants end market trends

Increased demand for frac sand over the last several years was driven by the growth in the use of hydraulic fracturing as a means to extract hydrocarbons from shale formations. According to the 2014 Proppant Market Report, PropTester Inc., published February 2015, global frac sand consumption grew at a 51.2% compound annual growth rate from 2009 to 2014. This included 53.7% growth in frac sand demand from 2013 to 2014. We significantly expanded our sales efforts to the frac sand market in 2008 and experienced rapid growth in our sales associated with our oil and gas activities from 2008 until 2014.

Recent declines in oil prices have reduced oil and gas drilling and completion activity in North America. According to internal U.S. Silica management estimates, we expect to see continued decline in 2015 proppant demand mainly due to decreased rig count, partially offset by higher proppant per well. During the nine months ended September 30, 2015, we have experienced the impacts of reduced demand from our customers. The table below summarizes some revenue metrics of our Oil & Gas Proppants segment for the three months ended September 30, 2015, June 30, 2015, March 31, 2015 and December 31, 2014:



Dollars in thousands except per ton data			Three Months Ended						Percentage Change for Three Months Ended
Dollars in thousands except per ton data	September 30,		June 30,		March 31,		December 31,		September 30, 2015 vs. June 30, 2015		June 30, 2015 vs. March 31, 2015		March 31, 2015 vs. December 31, 2014
Oil & Gas Proppants	2015		2015		2015		2014		September 30, 2015 vs. June 30, 2015		June 30, 2015 vs. March 31, 2015		March 31, 2015 vs. December 31, 2014
Sales	$	101,987	$	90,855	$	148,753	$	196,043	12	%	(39	)%	(24	)%
Tons Sold	1,616		1,224		1,688		1,997		32	%	(27	)%	(15	)%
Average Selling Price per Ton	$	63.11	$	74.23	$	88.12	$	98.17	(15	)%	(16	)%	(10	)%

Although our Oil & Gas Proppants tons sold improved by 32% for the three months ended September 30, 2015 compared to the three months ended June 30, 2015 due to our market share gain efforts, we expect the demand for frac sand to deteriorate due to an expected decline in our customers' drilling and completion activity towards the end of 2015. A continued reduction in oil and gas drilling and completion activity may reduce frac sand demand further, which could result in us selling fewer tons, selling tons at lower prices, or both. If we sell less frac sand, or sell frac sand at lower prices, our revenue, net income, cash generated from operating activities, and liquidity would be adversely affected. We could evaluate further actions to reduce cost and improve liquidity. For instance, depending on market conditions, we may implement additional cost improvement projects or further reduce our capital spending for 2015 and beyond and may delay or cancel capital projects.

Additionally, due to impacts of reduced demand for our Frac sand during the nine months ended September 30, 2015, we are engaged in ongoing discussions with our take-or-pay supply agreement customers regarding pricing and

volume requirements under our existing contracts. While these discussions continue, in certain circumstances we have provided contract customers with temporary reductions to contract pricing in exchange for additional term and/or volume in order to preserve the value of these agreements. We may deliver sand at prices or at volumes below the requirements in our existing take-or-pay supply agreements. We expect these circumstances may continue for the remainder of 2015 and will likely continue into 2016.

We believe fluctuations in demand and price may occur as the market adjusts to changing supply and demand due to energy pricing fluctuations. However, we continue to expect long-term growth in oil and gas drilling in North American shale basins.

Oil and natural gas exploration and production companies' and oilfield service providers’ preferences and expectations have been evolving in recent years. A proppant vendor’s logistics capabilities have become an important differentiating factor when competing for business on both a spot and contract basis. Many of our customers increasingly seek convenient in-basin proppant delivery capability from their proppant supplier. We believe that, over time, proppant customers will prefer to consolidate their purchases across a smaller group of suppliers with robust logistics capabilities and a broad offering of high performance proppants.

Industrial and specialty products end market trends

Demand in the Industrial & Specialty Products end markets is relatively stable and is primarily influenced by key macroeconomic drivers such as housing starts, light vehicle sales, repair and remodel activity and industrial production. The economic downturn beginning in 2008 decreased demand in the foundry, building products and glassmaking end markets; however, the recent economic recovery has significantly increased demand in these end markets. Moreover, the abundance of low-cost natural gas has provided a catalyst for certain U.S. industrial companies to bring production capacity back online, such as the foundry industry, boosting demand for our products. The primary end markets served by our production used in Industrial & Specialty Products are foundry, automotive, building products, sports and recreation, glassmaking and filtration.

Our Strategy

The key drivers of our growth strategy include:


•	Expand our Oil & Gas Proppants production capacity and product portfolio. We continue to execute on several initiatives to increase our frac sand production capacity and augment our proppant product portfolio.


◦	In 2014, we made an initial investment in a new Greenfield site near Fairchild, Wisconsin, which, depending on market conditions, could become operational as early as 2017 and eventually add 3,000,000 tons of annual demonstrated frac sand capacity.


◦	In 2014, we made an initial investment in an 800,000 ton-per-year expansion at our Pacific, Missouri facility. This project includes adding a dryer as well as a new transload facility to support the additional volume and, depending on market conditions, could come online as early as 2017.

◦

On July 31, 2014, we completed our acquisition of Cadre, a leading regional sand mining company based in Voca, Texas. Cadre operates a single frac sand mine and plant, with an annual demonstrated capacity of about 800,000 tons of Premium Hickory® sand and has more than 65 years of high quality reserves. See accompanying Note C - Business Combinations of our Financial Statements for more information regarding this acquisition.

•

Increase our presence and product offering in industrial and specialty products end markets. Our research and business development teams work in tandem with our customers to develop new products which we expect will either increase our presence and market share in certain industrial and specialty products end markets or allow us to enter new markets. We manage a robust pipeline of new products in various stages of development. Some of these products have already come to market, resulting in a positive impact on our financial results. We continue to work toward offering more value-driven industrial and specialty products that will enhance the profitability of the business.

•

Optimize product mix and further develop value-added capabilities to maximize margins. We continue to actively manage our product mix at each of our plants to ensure we maximize 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 expect to continue investing in ways to increase the value we provide to our customers by expanding our product offerings, adding to our transportation assets, improving our supply chain management, upgrading our information technology, and creating a world class customer service model.

•

Expand our supply chain network and leverage our logistics capabilities to meet our customers’ needs in each strategic oil and gas basin. We continue to expand our transload network to ensure product is available to meet the in-basin needs of our customers. This approach allows us to provide strong customer service and puts us in a position to take advantage of opportunistic spot market sales. Our plant sites are strategically located to provide access to key Class I railroads, which enables us to cost effectively send product to each of the strategic basins in North America. We can ship product by truck, barge and rail with an ability to connect to short-line railroads as necessary to meet our customers’ evolving in-basin product needs. We believe that our supply chain network and logistics capabilities are a competitive advantage that enables us to provide superior service for our customers. For example, in 2013, we opened our San Antonio, Texas unit-train receiving transload facility, which was built in partnership with BNSF Railway to support the Eagle Ford market. Additionally, in 2015, we opened our Odessa, Texas, two-unit-train storage capacity transload facility which was built in partnership with Union Pacific Railroad to mainly support the Permian market. We expect to continue to make strategic investments and develop partnerships with transload operators and transportation providers that will enhance our portfolio of supply chain services that we can provide to customers. As of September 30, 2015, we have storage capacity at 45 transloads located near all of the major shale basins in the United States.

•

Evaluate both Greenfield and Brownfield expansion opportunities and other acquisitions. We expect to 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. For instance, we are evaluating the potential development of a Greenfield project in Wisconsin, which could add 3,000,000 tons of annual demonstrated frac sand capacity. Depending on market conditions, this facility could become operational in 2017. Additionally, we are continuing to actively pursue acquisitions to grow, by taking advantage of our asset footprint, our management’s experience with high-growth businesses, and our strong customer relationships. Our primary objective is to acquire assets with differing levels of frac sand quality that are complementary to our Oil & Gas Proppants segment, with a focus on mining, processing and logistics to further enhance our market presence. We prioritize acquisitions that provide opportunities to realize synergies (and, in some cases, the acquisition may be accretive assuming synergies), including entering new geographic and frac sand product markets, acquiring attractive customer contracts and improving operations. For instance, we completed the Cadre acquisition on July 31, 2014, which generated synergies and positively impacted our results of operations. See accompanying Note C - Business Combinations of our Financial Statements for pro forma results of operations related to the Cadre acquisition. We are in active discussions to acquire assets fitting this strategy, which, if completed, would be “significant” under Regulation S-X and could require additional sources of financing. There can be no assurance that we will reach a definitive agreement and complete any of these potential transactions. See the risk factors disclosed in Item 1A of Part I of our 2014 Annual Report, including the risk factor entitled, “If we cannot successfully complete acquisitions or integrate acquired businesses, our growth may be limited and our financial condition may be adversely affected.”

•

Maintain financial strength and flexibility. We intend to maintain financial strength and flexibility to enable us to better manage through the oil and gas proppant industry downturn and pursue acquisitions and new growth opportunities as they arise. In December 2014, we upsized our revolving line-of-credit and amended our senior secured term loan facility (the “Term Loan”) by an additional $135.0 million to a total of approximately $500.0 million. As of September 30, 2015, we had $253.8 million of cash on hand, $46.0 million in short-term investments and $46.9 million of availability under our Revolver.

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 and the number of tons sold. The price invoiced reflects product, transportation and additional services as applicable, such as storage and transloading the product from railcars to trucks for delivery to the customer site. We invoice the majority of our customers on a per shipment basis, although for some larger customers, we consolidate invoices weekly or monthly. Our five largest customers accounted for approximately 40% of total sales during the nine months ended September 30, 2015. Sales to our two largest customers, Schlumberger N.V. and Halliburton Company accounted for 13% and 12% of our total revenues, respectively, during the nine months ended September 30, 2015. No other customer accounted for 10% or more of our total revenues.

We primarily sell our products under short-term price agreements or at prevailing market rates. For a number of customers, we sell under long-term, competitively-bid contracts. As of October 28, 2015, we have seven take-or-pay supply agreements in the Oil & Gas Proppants segment with initial terms expiring between 2015 and 2019. 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. Additionally, at the time the take-or-pay supply agreements were signed, some customers provided advance payments for future shipments. 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 take-or-pay supply agreements accounted for 32% and 45% of our total company revenue during the nine months ended September 30, 2015 and 2014, respectively. Although sales under take-or-pay supply agreements may result in us realizing lower margins than we otherwise might during periods of high market prices, we believe such lower margins are offset by the benefits derived from the product mix and sales volume stability afforded by such supply agreements, which helps us lower market risk arising from adverse changes in spot prices and market conditions. Additionally, selling more tons under supply contracts also enables us to be more efficient from a production, supply chain and logistics standpoint. As discussed in Part I, Item 1A., "Risk Factors", of our 2014 Annual Report—"A large portion of our sales is generated by our top customers, and the loss of, or significant reduction in, purchases by our largest customers could adversely affect our operations,” these customers may not continue to purchase the same levels of product in the future due to a variety of reasons, contract requirements notwithstanding.

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. Transportation and related costs include freight charges, fuel surcharges, transloading fees, switching fees, railcar lease costs, demurrage costs and storage fees. 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.

Additionally, we incur expenses related to our corporate operations, including costs for sales and marketing; research and development; and finance, legal, environmental, health and safety functions of our organization. These costs are principally driven by personnel expenses.

How We Evaluate Our Business

Our management team evaluates our business using a variety of financial and operational metrics. Our business is organized into two segments, Oil & Gas Proppants and Industrial & Specialty Products. We evaluate the performance of these segments based on their tons sold, average selling price and contribution margin earned. Additionally, we consider a number of factors in evaluating the performance of the business as a whole, including total tons sold, average selling 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 that are related to corporate functional areas such as operations management, corporate purchasing, accounting, treasury, information technology, legal and human resources.

Segment contribution margin is not a measure of our financial performance under GAAP and should not be considered an alternative to measures derived in accordance with GAAP. For more details on the reconciliation of segment contribution margin to its most directly comparable GAAP financial measure, income (loss) before income taxes, see Note O - Segment Reporting to our Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.

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 Revolver contains a consolidated total net leverage ratio that we must meet as of the last day of any fiscal quarter whenever usage of the Revolver (other than certain undrawn letters of credit) exceeds 25% of the Revolver commitment, which is calculated based on our Adjusted EBITDA. Noncompliance with the financial ratio covenant contained in the Revolver could result in the acceleration of our obligations to repay all amounts outstanding under the Revolver and the Term Loan. 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.

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.

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



	Three Months Ended September 30,					Nine Months Ended September 30,
	2015			2014		2015			2014
Net income	$	2,412		$	41,277	$	27,188		$	88,302
Total interest expense, net of interest income	6,485			4,859		19,961			12,543
Provision for taxes	(4,695		)	14,427		(7,584		)	31,907
Total depreciation, depletion and amortization expenses	15,158			12,425		42,096			32,355
EBITDA	19,360			72,988		81,661			165,107
Non-cash incentive compensation ⁽¹⁾	1,913			1,424		1,824			4,807
Post-employment expenses (excluding service costs) ⁽²⁾	765			380		2,501			1,143
Business development related expenses ⁽³⁾	390			1,339		8,343			4,978
Other adjustments allowable under our existing credit agreement ⁽⁴⁾	1,577			1,356		4,402			3,165
Adjusted EBITDA	$	24,005		$	77,487	$	98,731		$	179,200




₍₁₎	Reflects stock based compensation including adjustments for the revaluation of performance share units.
₍₂₎	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 M - Pension and Post-retirement Benefits to our Financial Statements in Part 1, Item 1 of this Quarterly Report on Form 10-Q.
₍₃₎	Reflects expenses related to business development activities in connection with our growth and expansion initiatives.
₍₄₎	Reflects miscellaneous adjustments permitted under our existing credit agreement, including such items as restructuring costs and certain employment agency fees. We incurred restructuring costs of $0.5 million and $2.7 million, mostly severance expense, during the three and nine months ended September 30, 2015, respectively, for actions that will provide future cost savings.

Results of Operations for the Three Months Ended September 30, 2015 and 2014

Sales



All numbers in thousands except per ton data	Three Months Ended September 30,				Amount Change			Percent Change
	2015		2014		'15 vs. '14			'15 vs. '14
Sales:
Oil & Gas Proppants	$	101,987	$	186,812	$	(84,825	)	(45	)%
Industrial & Specialty Products	53,421		54,444		(1,023		)	(2	)%
Total Sales	$	155,408	$	241,256	$	(85,848	)	(36	)%
Tons:
Oil & Gas Proppants	1,616		1,895		(279		)	(15	)%
Industrial & Specialty Products	1,007		1,098		(91		)	(8	)%
Total Tons	2,623		2,993		(370		)	(12	)%
Average Selling Price per Ton:
Oil & Gas Proppants	$	63.11	$	98.58	$	(35.47	)	(36	)%
Industrial & Specialty Products	53.05		49.58		3.47			7	%
Overall Average Selling Price per Ton:	$	59.25	$	80.61	$	(21.36	)	(26	)%

Total sales decreased 36% for the three months ended September 30, 2015 compared to the three months ended September 30, 2014, driven by a 12% decrease in total tons sold and a 26% decrease in overall average selling price. Tons sold in-basin represented 37% and 43% of total company tons sold for the three months ended September 30, 2015 and 2014, respectively.

The decrease in total sales was primarily driven by Oil & Gas Proppants sales, which decreased 45%. Oil & Gas Proppants tons sold for the three months ended September 30, 2015 decreased 15% and average selling price decreased 36%. These decreases were driven by a year over year decrease in demand for our frac sand from customers due to reduced drilling and completion activity.

Industrial & Specialty Products sales decreased by 2% for the three months ended September 30, 2015 compared to the three months ended September 30, 2014. Tons sold decreased 8% driven by our strategic shift among customers and products. Average selling price increased 7%, which was primarily a result of new higher-margin product sales and price increases.

Cost of Goods Sold

Cost of goods sold decreased by $27.1 million, or 18%, to $122.6 million for the three months ended September 30, 2015 compared to $149.7 million for the three months ended September 30, 2014. The decrease is mainly a result of fewer tons sold. As a percentage of sales, costs of goods sold increased to 79% for the three months ended September 30, 2015 compared to 62% for the same period in 2014. These changes result from the main components of cost of goods sold as discussed below.

We incurred $68.0 million and $80.9 million of transportation and related costs for the three months ended September 30, 2015 and 2014, respectively. This decrease was due to fewer tons sold through transloads caused by lower demand for our frac sand at our transload sites. As a percentage of sales, transportation and related costs increased to 44% for the three months ended September 30, 2015 compared to 34% for the same period in 2014 mainly due to a lower average selling price.

We incurred $19.5 million and $20.1 million of operating labor costs for the three months ended September 30, 2015 and 2014, respectively. The $0.7 million decrease in labor costs incurred was primarily due to fewer tons sold and lower employee headcount, mostly offset by the addition of our Voca, Texas and Utica, Illinois facilities. As a percentage of sales, operating labor costs represented 13% for the three months ended September 30, 2015 compared to 8% for the same period in 2014.

We incurred $7.1 million and $8.0 million of electricity and drying fuel (principally natural gas) costs for the three months ended September 30, 2015 and 2014, respectively. The decrease in electricity and drying fuel costs incurred was mainly

driven by fewer tons sold and lower natural gas prices. As a percentage of sales, electricity and drying fuel costs increased to 5% for the three months ended September 30, 2015 compared to 3% for the same period in 2014.

We incurred $9.5 million and $10.9 million of maintenance and repair costs for the three months ended September 30, 2015 and 2014, respectively. The decrease in maintenance and repair costs incurred was due to scheduled maintenance and fewer tons sold. As a percentage of sales, maintenance and repair costs increased to 6% for the three months ended September 30, 2015 compared to 5% for the same period in 2014.

Segment Contribution Margin

Oil & Gas Proppants contribution margin decreased by $60.5 million, or 79%, to $16.5 million for the three months ended September 30, 2015 compared to $77.0 million for the three months ended September 30, 2014, driven by a $84.8 million decrease in segment revenue, partially offset by lower segment cost of goods sold mainly due to fewer tons sold.

Industrial & Specialty Products contribution margin increased by $3.1 million, or 19%, to $20.0 million for the three months ended September 30, 2015 compared to $16.8 million for the three months ended September 30, 2014, driven by increased higher-margin products sales as a percentage of total sales.

Selling, General and Administrative Expenses

Selling, general and administrative expenses decreased by $5.0 million, or 27%, to $13.6 million for the three months ended September 30, 2015 compared to $18.6 million for the three months ended September 30, 2014. The decrease was due to the following factors:


•	Business development related expense decreased by $0.9 million to $0.4 million for the three months ended September 30, 2015 compared to $1.3 million for the three months ended September 30, 2014, primarily due to expenses related to the Cadre acquisition in 2014.


•	Compensation related expense decreased by $1.8 million for the three months ended September 30, 2015 compared to 2014, primarily due to reduced incentive compensation and lower employee headcount.


•	Bad debt expense decreased by $0.5 million for the three months ended September 30, 2015 compared to the three months ended September 30, 2014, mainly due to a decrease in sales.

In total, our selling, general and administrative costs represented approximately 9% and 8% of our sales for the three months ended September 30, 2015 and 2014, respectively.

Depreciation, Depletion and Amortization

Depreciation, depletion and amortization expense increased by $2.7 million, or 22%, to $15.2 million for the three months ended September 30, 2015 compared to $12.4 million for the three months ended September 30, 2014. The year over year increase was driven by the addition of our Voca, Texas plant, Utica, Illinois plant, Odessa, Texas transload facility and other continued capital spending. Depreciation, depletion and amortization costs represented approximately 10% and 5% of our sales for the three months ended September 30, 2015 and 2014, respectively.

Operating Income

Operating income decreased by $56.4 million, or 93%, to $4.1 million for the three months ended September 30, 2015 compared to $60.5 million for the three months ended September 30, 2014. The decrease was due to a 36% decrease in sales and a 22% increase in depreciation, depletion and amortization expense, partially offset by an 18% decrease in cost of goods sold and a 27% decrease in selling, general and administrative expense.

Interest Expense

Interest expense increased by $1.7 million, or 35%, to $6.7 million for the three months ended September 30, 2015 compared to $5.0 million for the three months ended September 30, 2014, mainly driven by an increase in debt principal.

Provision for Income Taxes

During the three months ended September 30, 2015 we recognized an income tax benefit of $4.7 million. Considering the current market conditions as discussed in the Recent Trends and Outlook section of the MD&A, we updated our estimated

annual effective tax rate to (16)%. Our estimated annual effective tax rate is negative as a result of our statutory percentage depletion benefit being greater than the computed income tax expense on our estimated annual income before income taxes. Our tax benefit in the period primarily represented the cumulative adjustment to reflect the updated estimated annual effective tax rate of (16)%, exclusive of the discrete tax benefit (see accompanying Note L - Income Taxes of our Financial Statements for more information about the discrete tax benefit).

The income tax expense was $14.4 million for the three months ended September 30, 2014. The decrease of $19.1 million in income tax expense was mainly driven by a decrease in profit before income tax and the cumulative adjustment due to a change in the 2015 estimated annual effective tax rate. The effective tax rate was 206% and 26% for the three months ended September 30, 2015 and 2014, respectively. Because of the updated tax rate and cumulative adjustment in the period, the 206% tax rate is not representative of future tax rates.

Net Income/Loss

Net income was $2.4 million and $41.3 million for the three months ended September 30, 2015 and 2014, respectively. The year over year decrease was due to the factors noted above.

Results of Operations for the Nine Months Ended September 30, 2015 and 2014

Sales



All numbers in thousands except per ton data	Nine Months Ended September 30,				Amount Change			Percent Change
	2015		2014		'15 vs. '14			'15 vs. '14
Sales:
Oil & Gas Proppants	$	341,593	$	466,727	$	(125,134	)	(27	)%
Industrial & Specialty Products	165,284		160,425		4,859			3	%
Total Sales	$	506,877	$	627,152	$	(120,275	)	(19	)%
Tons:
Oil & Gas Proppants	4,529		4,738		(209		)	(4	)%
Industrial & Specialty Products	3,024		3,168		(144		)	(5	)%
Total Tons	7,553		7,906		(353		)	(4	)%
Average Selling Price per Ton:
Oil & Gas Proppants	$	75.42	$	98.51	$	(23.09	)	(23	)%
Industrial & Specialty Products	54.66		50.64		4.02			8	%
Overall Average Selling Price per Ton:	$	67.11	$	79.33	$	(12.22	)	(15	)%

Total sales decreased 19% for the nine months ended September 30, 2015 compared to the nine months ended September 30, 2014, driven by a 15% decrease in overall average selling price and a 4% decrease in total tons sold. Tons sold in-basin represented 37% and 41% of total company tons sold for the nine months ended September 30, 2015 and 2014, respectively.

The decrease in total sales was driven by Oil & Gas Proppants sales, which decreased 27%. Oil & Gas Proppants tons sold for the nine months ended September 30, 2015 decreased 4% and average selling price decreased 23%. These decreases were driven by the year over year decrease in demand for our frac sand from customers due to reduced drilling and completion activity.

Industrial & Specialty Products sales increased 3% for the nine months ended September 30, 2015 compared to the nine months ended September 30, 2014, primarily driven by an 8% increase in average selling price partially offset by a 5% decrease in tons sold. The increase in average selling price was primarily a result of new higher-margin product sales and price increases. The decrease in tons sold was driven by our strategic shift among customers and products.

Cost of Goods Sold

Cost of goods sold decreased by $30.4 million, or 7%, to $378.5 million for the nine months ended September 30, 2015 compared to $408.9 million for the nine months ended September 30, 2014. The decrease was mainly a result of fewer tons sold. As a percentage of sales, costs of goods sold increased to 75% for the nine months ended September 30, 2015 compared to 65% for the same period in 2014. These changes result from the main components of cost of goods sold as discussed below.

We incurred $199.1 million and $231.6 million of transportation and related costs for the nine months ended September 30, 2015 and 2014, respectively. This decrease was due to fewer tons sold through transloads caused by lower demand for our frac sand at our transload sites. As a percentage of sales, transportation and related costs increased to 39% for the nine months ended September 30, 2015 compared to 37% for the same period in 2014 mainly due to a decrease in average selling price.

We incurred $60.9 million and $52.7 million of operating labor costs for the nine months ended September 30, 2015 and 2014, respectively. The increase in labor costs incurred was primarily due to the addition of our Voca, Texas and Utica, Illinois facilities, partially offset by lower employee headcount. As a percentage of sales, operating labor costs represented 12% for the nine months ended September 30, 2015 compared to 8% for the same period in 2014.

We incurred $21.8 million and $24.4 million of electricity and drying fuel (principally natural gas) costs for the nine months ended September 30, 2015 and 2014, respectively. The decrease in electricity and drying fuel costs incurred was due to fewer tons sold and lower natural gas prices. As a percentage of sales, electricity and drying fuel costs remained flat at 4% for the nine months ended September 30, 2015 compared to the same period in 2014.

We incurred $28.8 million and $24.5 million of maintenance and repair costs for the nine months ended September 30, 2015 and 2014, respectively. The increase in maintenance and repair costs incurred was due to scheduled maintenance and the the addition of our Voca, Texas and Utica, Illinois facilities. As a percentage of sales, maintenance and repair costs increased to 6% for the nine months ended September 30, 2015 compared to 4% for the same period in 2014.

Segment Contribution Margin

Oil & Gas Proppants contribution margin decreased by $93.7 million, or 53%, to $82.0 million for the nine months ended September 30, 2015 compared to $175.7 million for the nine months ended September 30, 2014, driven by a 27% decrease in revenue partially offset by a 11% decrease in segment cost of goods sold.

Industrial & Specialty Products contribution margin increased by $7.3 million, or 15%, to $55.0 million for the nine months ended September 30, 2015 compared to $47.6 million for the nine months ended September 30, 2014, driven the by a 3% increase in revenue and a 2% decrease in segment cost of goods sold.

Selling, General and Administrative Expenses

Selling, general and administrative expenses decreased by $6.2 million, or 12%, to $47.1 million for the nine months ended September 30, 2015 compared to $53.3 million for the nine months ended September 30, 2014. The decrease was primarily due to the following factors:


•	Compensation related expense decreased by $5.9 million for the nine months ended September 30, 2015 compared to 2014, primarily due to reduced incentive compensation and lower employee headcount.


•	Bad debt expense decreased by $2.4 million for the nine months ended September 30, 2015 compared to the nine months ended September 30, 2014 due to a decrease in our revenue and a recovery of a previously reserved receivable.


•	Business development related expense increased by $3.4 million to $8.3 million for the nine months ended September 30, 2015 compared to $5.0 million for the nine months ended September 30, 2014. This increase is mainly due to a $6.5 million settlement of an unfavorable arbitration ruling (see Note K - Commitments and Contingencies of our Financial Statements for more information).

In total, our selling, general and administrative costs represented approximately 9% of our sales for both the nine months ended September 30, 2015 and the nine months ended September 30, 2014.

Depreciation, Depletion and Amortization

Depreciation, depletion and amortization expense increased by $9.7 million, or 30%, to $42.1 million for the nine months ended September 30, 2015 compared to $32.4 million for the nine months ended September 30, 2014. The year over year increase was driven by the addition of our Voca, Texas plant, Utica, Illinois plant, Odessa, Texas transload facility and other continued capital spending. Depreciation, depletion and amortization costs represented approximately 8% and 5% of our sales for the nine months ended September 30, 2015 and 2014, respectively.

Operating Income

Operating income decreased by $93.4 million, or 70%, to $39.2 million for the nine months ended September 30, 2015 compared to $132.6 million for the nine months ended September 30, 2014. The decrease was due to a 19% decrease in sales and a 30% increase in depreciation, depletion and amortization expense, partially offset by a 7% decrease in cost of goods sold and a 12% decrease in selling, general and administrative expense.

Interest Expense

Interest expense increased by $7.7 million, or 60%, to $20.4 million for the nine months ended September 30, 2015 compared to $12.8 million for the nine months ended September 30, 2014, mainly due to an increase in debt principal and interest expense on deferred revenue.

Provision for Income Taxes

During the nine months ended September 30, 2015 we recognized an income tax benefit of $7.6 million. Considering the current market conditions as discussed in the Recent Trends and Outlook section of the MD&A, we updated our estimated annual effective tax rate to (16)%. Our estimated annual effective tax rate is negative as a result of our statutory percentage depletion benefit being greater than the computed income tax expense on our estimated annual income before income taxes.

Income tax expense was $31.9 million for the nine months ended September 30, 2014. The decrease of $39.5 million in income tax expense was mainly driven by a decrease in effective tax rate. The effective tax rate was (39)% and 27% for the nine months ended September 30, 2015 and 2014, respectively. Because of the update to the estimated annual tax rate and the discrete tax benefit in the period, the (39)% tax rate is not representative of future tax rates.

Net Income/Loss

Net income was $27.2 million and $88.3 million for the nine months ended September 30, 2015 and 2014, respectively. The year over year decrease was 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 return cash to our stockholders, 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 cash on hand or 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, 2015, our working capital was $385.1 million and we had $46.9 million of availability under the Revolver.

We believe that cash generated through operations and our financing arrangements will be sufficient to meet working capital requirements, anticipated capital expenditures, scheduled debt payments for at least the next 12 months and any dividends declared.

Management and our Board remain committed to evaluating additional ways of creating shareholder value. Any determination to pay dividends and other distributions in cash, stock, or property in the future will be at the discretion of our Board 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 agreements, and other factors. Additionally, because we are a holding company, our ability to pay dividends on our common stock may be 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.

Cash Flow Analysis

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



	Nine Months Ended September 30,						Percent Change
	2015			2014			’15 vs. ‘14
Net cash provided by (used in):
Operating activities	$	36,416		$	106,987		(66	)%
Investing activities	(8,702		)	(149,880		)	(94	)%
Financing activities	(41,230		)	86,345			(148	)%

Net Cash Provided by Operating Activities

Operating activities consist primarily of net income adjusted for certain non-cash and working capital items. Adjustments to net income for non-cash items include depreciation, depletion and amortization, deferred revenue, deferred income taxes, equity-based compensation and allowance for doubtful accounts. In addition, operating cash flows include the effect of changes in operating assets and liabilities, principally accounts receivable, inventories, prepaid expenses and other current assets, income taxes payable and receivable, accounts payable and accrued expenses.

Net cash provided by operating activities was $36.4 million for the nine months ended September 30, 2015 compared to $107.0 million for the nine months ended September 30, 2014. This $70.6 million decrease in cash provided by operations was the result of a $61.1 million decrease in net income and the impact of the other components of operating activities.

Net Cash Used in Investing Activities

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

Net cash used in investing activities was $8.7 million and $149.9 million for the nine months ended September 30, 2015 and 2014, respectively. Capital expenditures for the nine months ended September 30, 2015, which totaled $38.2 million, were primarily for the engineering, procurement and construction of our growth projects including the Greenfield raw sand plant near Fairchild, Wisconsin and other maintenance and cost improvement capital projects. Capital expenditures for the nine months ended September 30, 2014, which totaled $51.6 million, were primarily for the continuing engineering, procurement and construction of our Greenfield raw sand plant in Utica, Illinois, our new transload facility in Odessa, Texas, and other maintenance capital projects. Amounts spent on capital projects for the nine months ended September 30, 2015 were partially offset by $29.4 million in proceeds from sales and maturities of short-term investments that were not reinvested.

Subject to our continuing evaluation of market conditions, we anticipate that our capital expenditures in 2015 will be in a range of $50 million to $55 million, which is primarily associated with growth, maintenance and cost improvement capital projects. We expect to fund our capital expenditures through cash on our balance sheet, cash generated from our operations and cash generated from financing activities.

Net Cash Used in/Provided by Financing Activities

Financing activities consist primarily of equity issuances, capital contributions, dividend payments, borrowings and repayments related to the Revolver and Term Loan, as well as fees and expenses paid in connection with our credit facilities, advance payments from our customers, and outstanding checks to our vendors.

Net cash used in financing activities was $41.2 million for the nine months ended September 30, 2015, driven by $15.3 million of common stock repurchases, $20.1 million of dividends paid, $3.8 million of long-term debt payments and a $1.8 million decrease in book overdraft.

Net cash provided by financing activities was $86.3 million in the nine months ended September 30, 2014, driven by a $100.0 million advanced deposit from a customer, $5.4 million in proceeds from options exercised, and a $3.7 million excess tax benefit from equity-based compensation partially offset by $20.1 million in dividend payments.

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 outside the ordinary course of business to our “Contractual Obligations” table in Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” of our 2014 Annual Report, except that we entered into additional new leases for railroad cars. For more details on future minimum annual commitments under such operating leases, please see accompanying Note K - Commitments and Contingencies to our Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.

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. As of September 30, 2015, we had $13.3 million accrued for future reclamation costs, as compared to $11.3 million as of December 31, 2014.

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 1, “Business,” Item 1A, “Risk Factors” Item 3, “Legal Proceedings”, and Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Environmental Matters” in our 2014 Annual Report.

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 2014 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 A - Summary of Significant Accounting Policies 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, Compensation Committee and Nominating and Governance Committee 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 Conduct and 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 or IR@ussilica.com.



ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market Risk

We are exposed to certain market risks, which exist as a part of our ongoing business operations. Such risks arise from adverse changes in market rates, prices and conditions. We address such market risks as discussed in "How We Generate Our Sales" in Item 2 of this Form 10-Q, Management's Discussion and Analysis of Financial Condition and Results of Operations.

Interest Rate Risk

We are exposed to interest rate risk arising from adverse changes in interest rates. As of September 30, 2015, we have $500.6 million of debt outstanding under our senior credit facility. Assuming no change in the amount outstanding, and LIBOR is greater than the 1.0% minimum base rate on the Term Loan, a hypothetical increase or decrease in interest rates by 1.0% would have changed our interest expense by $1.7 million per year.

We use interest rate derivatives in the normal course of our business to manage both our interest cost and the risks associated with changing interest rates. We do not use derivatives for trading or speculative purposes. The following table summarizes the fair value of our derivative instruments at September 30, 2015 and December 31, 2014.



		September 30, 2015					December 31, 2014
	Maturity Date	Contract/Notional Amount	Carrying Amount		Fair Value		Contract/Notional Amount	Carrying Amount		Fair Value
Interest rate cap agreement⁽¹⁾	2016	$252 million	$	—	$	—	$188 million	$	5	$	5




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

Credit Risk

We are subject to risks of loss resulting from nonpayment or nonperformance by our customers. We examine the 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. Despite enhancing our examination of our customers' credit worthiness, we may still experience delays or failures in customer payments.



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, 2015. 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, 2015, 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, 2015 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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, three and one new silicosis cases filed in 2012, 2013 and 2014, respectively. During the nine months ended September 30, 2015, no additional claims were brought against us. As of September 30, 2015, there are a total of approximately 75 active silica-related products liability claims pending in which we were a defendant and approximately 169 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. Prior to the fourth quarter of 2012, we had insurance policies for both our predecessors that covered certain claims for alleged silica exposure for periods prior to certain dates in 1985 and 1986 (with respect to certain insurance). As a result of a settlement with a former owner of ours and its insurers in the fourth quarter of 2012, some of these policies are no longer available to us, and we will not seek reimbursement for any defense costs or claim payments from these policies. Other insurance policies, however, continue to remain available to us and will continue to make such payments on our behalf.

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 do not have insurance coverage. Any such pending or future claims or inadequacies of our insurance coverage 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 our 2014 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, 2015, there have been no material changes to the risk factors disclosed in Item 1A of Part I in our 2014 Annual Report.



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

Share Repurchase Program

The following table presents the total number of shares of our common stock that we purchased during the third quarter of 2015, the average price paid per share, the number of shares that we purchased as part of our publicly announced repurchase program, and the approximate dollar value of shares that still could have been purchased at the end of the applicable fiscal period pursuant to our June 2012 share repurchase program:



Period	Total Number of Shares Purchased		Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Program⁽¹⁾	Maximum Dollar Value of Shares that May Yet Be Purchased Under the Program⁽¹⁾
July 2015	71	⁽²⁾	$	22.64	—
August 2015	445	⁽²⁾	$	24.58	—
September 2015	604	⁽²⁾	$	18.48	—
Total	1,120		$	21.90	—	$	33,173,725




₍₁₎	A program covering the repurchase of up to $25.0 million of our common stock was initially announced in June 2012 and was increased to $50.0 million in December 2014. This program expires on December 11, 2015.
₍₂₎	Represents shares withheld by U.S. Silica to pay taxes due upon the vesting of employee restricted stock.

Subsequent to September 30, 2015, we have not repurchased any shares of our common stock.

For more details on the stock repurchase program, see Note B - Capital Structure and Accumulated Comprehensive Income to our Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.



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, addressing 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, with the exception of our resin-coated sand facility, 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

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 three of our plants for a significant portion of our sales;


•	the level of activity in the natural gas and oil industries;


•	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 demand 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 and transload network access 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 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 substantial indebtedness and pension obligations;


•	restrictions imposed by our indebtedness on our current and future operations;


•	contractual obligations that require us to deliver minimum amounts of frac sand or purchase minimum amounts of services


•	the accuracy of our estimates of mineral reserves and resource deposits;


•	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;


•	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;


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


•	silica-related health issues and corresponding litigation;


•	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 2014 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 2014 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.



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.

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 28th day of October, 2015.



	U.S. Silica Holdings, Inc.

	/s/ DONALD A. MERRIL
	Name:		Donald A. Merril
	Title:		Chief Financial Officer

S-1

EXHIBIT INDEX



		Incorporated by Reference
Exhibit Number	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	Certificate of Change of Registered Agent and/or Registered Office	8-K	001-35416	3.1	May 11, 2015
3.3	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
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 Donald A. Merril, Chief Financial Officer.
32.1*	Section 1350 Certification by Bryan A. Shinn, Chief Executive Officer.
32.2*	Section 1350 Certification by Donald A. Merril, Chief Financial Officer.
95.1*	Mine Safety Disclosure
99.1*	Consent of PropTester, 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

Exhibit

Exhibit 31.1

CERTIFICATION

I, Bryan A. Shinn, certify that:



1.	I have reviewed this Quarterly Report on Form 10-Q of U.S. Silica Holdings, Inc. (the “Company”) for the quarter ended September 30, 2015;



2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;



3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;



4.	The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:



	a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;



	b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;



	c)	Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and



	d)	Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and



5.	The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):



	a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and



	b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: October 28, 2015



	/s/ BRYAN A. SHINN
	Name: Bryan A. Shinn
	Title: Chief Executive Officer

Exhibit

Exhibit 31.2

CERTIFICATION

I, Donald A. Merril, certify that:



1.	I have reviewed this quarterly report on Form 10-Q of U.S. Silica Holdings, Inc. (the “Company”) for the quarter ended September 30, 2015;



2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;



3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;



4.	The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:



	a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;



	b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;



	c)	Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and



	d)	Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and



5.	The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):



	a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and



	b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: October 28, 2015



	/s/ DONALD A. MERRIL
	Name: Donald A. Merril
	Title: Chief Financial Officer

Exhibit

Exhibit 32.1

SECTION 1350 CERTIFICATION

I, Bryan A. Shinn, Chief Executive Officer, U.S. Silica Holdings, Inc. (the “Company”), hereby certify, on the date hereof, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:



	i.	The Quarterly Report on Form 10-Q of the Company for the quarter ended September 30, 2015 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and



	ii.	The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: October 28, 2015



	/s/ BRYAN A. SHINN
	Name: Bryan A. Shinn
	Title: Chief Executive Officer

A signed copy of this original statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff on request.

Exhibit

Exhibit 32.2

SECTION 1350 CERTIFICATION

I, Donald A. Merril, Chief Financial Officer, U.S. Silica Holdings, Inc. (the “Company”), hereby certify, on the date hereof, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:



	i.	The Quarterly Report on Form 10-Q of the Company for the quarter ended September 30, 2015 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and



	ii.	The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: October 28, 2015



	/s/ DONALD A. MERRIL
	Name: Donald A. Merril
	Title: Chief Financial Officer

Exhibit

Exhibit 95.1

Mine Safety Disclosure

The following disclosures are provided pursuant to the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Act”) and Item 104 of Regulation S-K, which requires certain disclosures by companies required to file periodic reports under the Securities Exchange Act of 1934, as amended, that operate mines regulated under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”).

Mine Safety Information. Whenever the Federal Mine Safety and Health Administration (“MSHA”) believes a violation of the Mine Act, any health or safety standard or any regulation has occurred, it may issue a citation which describes the alleged violation and fixes a time within which the U.S. mining operator must abate the alleged violation. In some situations, such as when MSHA believes that conditions pose a hazard to miners, MSHA may issue an order removing miners from the area of the mine affected by the condition until the alleged hazards are corrected. When MSHA issues a citation or order, it generally proposes a civil penalty, or fine, as a result of the alleged violation, that the operator is ordered to pay. Citations and orders can be contested and appealed, and as part of that process, are often reduced in severity and amount, and are sometimes dismissed. The number of citations, orders and proposed assessments vary depending on the size and type (underground or surface) of the mine as well as by the MSHA inspector(s) assigned.

Mine Safety Data. The following provides additional information about references used in the table below to describe the categories of violations, orders or citations issued by MSHA under the Mine Act:


•	Section 104 S&S Citations: Citations received from MSHA under section 104 of the Mine Act for violations of mandatory health or safety standards that could significantly and substantially contribute to the cause and effect of a mine safety or health hazard.


•	Section 104(b) Orders: Orders issued by MSHA under section 104(b) of the Mine Act, which represents a failure to abate a citation under section 104(a) within the period of time prescribed by MSHA. This results in an order of immediate withdrawal from the area of the mine affected by the condition until MSHA determines that the violation has been abated.


•	Section 104(d) Citations and Orders: Citations and orders issued by MSHA under section 104(d) of the Mine Act for unwarrantable failure to comply with mandatory health or safety standards.


•	Section 110(b)(2) Violations: Flagrant violations issued by MSHA under section 110(b)(2) of the Mine Act.


•	Section 107(a) Orders: Orders issued by MSHA under section 107(a) of the Mine Act for situations in which MSHA determined an “imminent danger” (as defined by MSHA) existed.

The following table details the violations, citations and orders issued to us by MSHA during the quarter ended September 30, 2015:



Mine⁽¹⁾	Section 104 S&S Citations (#)	Section 104(b) Orders (#)	Section 104(d) Citations and Orders (#)	Section 110(b)(2) Violations (#)	Section 107(a) Orders (#)	Proposed Assessments⁽²⁾ ($, amounts in dollars)		Mining Related Fatalities (#)
Ottawa, IL	—	—	—	—	—	$	—	—
Mill Creek, OK	—	—	—	—	—	—		—
Pacific, MO	1	—	—	—	—	—		—
Berkeley Springs, WV	12	—	—	—	—	300		—
Mapleton Depot, PA	—	—	—	—	—	—		—
Kosse, TX	1	—	—	—	—	200		—
Mauricetown, NJ	—	—	—	—	—	100		—
Columbia, SC	2	—	—	—	—	2,135		—
Montpelier, VA	—	—	—	—	—	100		—
Rockwood, MI	—	—	—	—	—	200		—
Jackson, TN	—	—	—	—	—	—		—
Dubberly, LA	1	—	—	—	—	—		—
Hurtsboro, AL	—	—	—	—	—	—		—
Sparta, WI	—	—	—	—	—	—		—
Voca, TX	—	—	—	—	—	—		—
Peru, IL	8	—	—	—	—	1,408		—
Utica, IL	—	—	—	—	—	—		—

(1)

The definition of mine under section 3 of the Mine Act includes the mine, as well as other items used in, or to be used in, or resulting from, the work of extracting minerals, such as land, structures, facilities, equipment, machines, tools and minerals preparation facilities. Unless otherwise indicated, any of these other items associated with a single mine have been aggregated in the totals for that mine. MSHA assigns an identification number to each mine and may or may not assign separate identification numbers to related facilities such as preparation facilities. We are providing the information in the table by mine rather than MSHA identification number because that is how we manage and operate our mining business and we believe this presentation will be more useful to investors than providing information based on MSHA identification numbers.


(2)	Represents the total dollar value of proposed assessments from MSHA under the Mine Act relating to any type of citation or order issued during the quarter ended September 30, 2015.

Pattern or Potential Pattern of Violations. During the quarter ended September 30, 2015, none of the mines operated by us received written notice from MSHA of (a) a pattern of violations of mandatory health or safety standards that are of such nature as could have significantly and substantially contributed to the cause and effect of mine health or safety hazards under section 104(e) of the Mine Act or (b) the potential to have such a pattern.

Pending Legal Actions. There were 77 legal actions pending before the Federal Mine Safety and Health Review Commission (the Commission) as of September 30, 2015, each of which is a contest proceeding filed by us to challenge a citation or order issued by MSHA under the Mine Act and includes 32 contests challenging Section 104 S&S citations. During the quarter ended September 30, 2015, twelve legal actions were instituted and twelve legal actions were resolved. The Commission is an independent adjudicative agency established by the Mine Act that provides administrative trial and appellate review of legal disputes arising under the Mine Act.

Exhibit

Exhibit 99.1

CONSENT OF PROPTESTER, INC.

We hereby consent to the references to our company’s name in the Quarterly Report on Form 10-Q for the Quarterly Period Ended September 30, 2015 (the “Quarterly Report”) of U.S. Silica Holdings, Inc. (the “Company”) and the quotation by the Company in the Quarterly Report from 2014 Proppant Market Report, published February 2015. We also hereby consent to the filing of this letter as an exhibit to the Quarterly Report.



PROPTESTER, INC.

By:	/s/ Ian Renkes
	Name:	Ian Renkes
	Title:	VP of Operations

October 28, 2015