Document:

Horsehead-SupplementalIndentureTackOnJune2014_32269203_3

FOURTH SUPPLEMENTAL INDENTURE

Fourth Supplemental Indenture (this “Supplemental Indenture”), dated as of July 29, 2014, among Horsehead Holding Corp. (the “Issuer”), the subsidiaries of the Company set forth on the signature pages hereto (collectively, the “Guarantors”), and U.S. Bank National Association, as trustee under the Indenture referred to below (the “Trustee”).

W I T N E S S E T H:

WHEREAS, the Issuer and the Guarantors have heretofore executed and delivered to the Trustee an indenture (as amended or supplemented from time to time, the “Indenture”), dated as of July 26, 2012, providing for the issuance of 10.50% Senior Secured Notes due 2017 (the “Notes”);

WHEREAS, Sections 2.02 and 9.01(a)(9) of the Indenture provide that additional Notes ranking pari passu with the Initial Notes may be created and issued from time to time by the Issuer without notice to or consent of the Holders and shall be treated as and form a single class of securities with the Initial Notes and shall have the same terms as to status, redemption or otherwise as the Initial Notes;

WHEREAS, on June 3, 2013, the Issuer issued $20,000,000 in aggregate principal amount of additional Notes having identical terms as the Initial Notes (the “2013 Additional Notes”);

WHEREAS, the Issuer and the Guarantors desire to execute and deliver this Supplemental Indenture for the purpose of issuing $10,000,000 in aggregate principal amount of additional Notes, having identical terms as the Initial Notes and the 2013 Additional Notes (the “2014 Additional Notes”); and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders as follows:

1.Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2.Additional Notes. As of the date hereof, the Issuer will issue, and the Trustee will authenticate and deliver, the 2014 Additional Notes under the Indenture, having terms substantially identical in all material respects to the Initial Notes. The 2014 Additional Notes will accrue interest beginning on July 29, 2014.  The Initial Notes and the 2014 Additional Notes shall be treated as a single class for all purposes under the Indenture. For all purposes of the Indenture and the Collateral Agreements, the term “Notes” shall include the 2014 Additional Notes.

3.Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, AS APPLIED TO CONTRACTS MADE AND PERFORMED WITHIN THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS. EACH OF THE PARTIES HERETO AGREES TO SUBMIT TO THE JURISDICTION OF THE COURTS OF THE STATE OF NEW YORK IN ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE.

4.Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder heretofore or hereafter authenticated and delivered shall be bound hereby.

5.Counterparts. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

6.Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

[Signature Pages Follow]

2

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first written above.

ISSUER:

HORSEHEAD HOLDING CORP.

By: /s/ Robert D. Scherich    
      Name: Robert D. Scherich
      Title:   Vice President and Chief                   Financial Officer

GUARANTORS:

HORSEHEAD CORPORATION

By: /s/ Robert D. Scherich    
      Name: Robert D. Scherich
      Title:   Vice President and Chief                   Financial Officer

HORSEHEAD METAL PRODUCTS, INC.

By: /s/ Robert D. Scherich    
      Name: Robert D. Scherich
      Title:   Vice President and Chief                   Financial Officer

THE INTERNATIONAL METAL     RECLAMATION COMPANY,     INC.

By: /s/ Robert D. Scherich    
      Name: Robert D. Scherich
      Title:   Vice President and Chief                   Financial Officer

Signature Page to Supplemental Indenture

CHESTNUT RIDGE RAILROAD CORP.

By: /s/ Robert D. Scherich    
      Name: Robert D. Scherich
      Title:   Vice President and Chief                   Financial Officer

HORSEHEAD ZINC POWDERS, LLC

By: /s/ Robert D. Scherich    
      Name: Robert D. Scherich
      Title:   Vice President and Chief                   Financial Officer

Signature Page to Supplemental Indenture

TRUSTEE:

U.S. BANK NATIONAL ASSOCIATION,     as Trustee

By: /s/ Wally Jones        
      Name:  Wally Jones
      Title:    Vice President

Signature Page to Supplemental IndentureEX-10.1

 Exhibit 10.1 

AMENDMENT NO. 4 
 THIS AMENDMENT
NO. 4, dated as of June 27, 2014 (this “Amendment”), of the Credit Agreement referenced below by and among HURON CONSULTING GROUP INC., a Delaware corporation, as Borrower, the Guarantors identified herein, and BANK OF AMERICA,
N.A., as Administrative Agent for and on behalf of the Lenders. Capitalized terms used but not otherwise defined herein shall have the meanings provided in the Credit Agreement. 

W I T N E S S E T H 

WHEREAS, a $450 million credit facility consisting of a $247.5 million revolving credit facility and a $202.5 million term loan facility has
been established in favor of the Borrower pursuant to the terms of that certain Amended and Restated Credit Agreement dated as of April 14, 2011 (as amended and modified, the “Credit Agreement”) by and among Huron Consulting
Group Inc., a Delaware corporation, as Borrower, certain subsidiaries of Huron Consulting Group Inc., as Guarantors, the Lenders identified therein and Bank of America, N.A., as Administrative Agent and Collateral Agent; 

WHEREAS, the Borrower has requested amendment of the Credit Agreement in certain respects; and 

WHEREAS, the Lenders have agreed to the requested amendments on the terms and conditions set forth herein. 

NOW, THEREFORE, in consideration of the premises contained herein and for other good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the parties hereto, intending to be legally bound hereby, agree as follows: 
 Section 1.
Amendment. The Credit Agreement is amended in the following respects: 
 1.1 In Section 8.02 (Investments), the
“and” at the end of clause (l) is deleted, a new clause (m) is added and clause (m) is amended and renumbered, to read as follows: 

(m) Investments of up to $17.5 million in Shorelight Holdings, LLC; and 

(n) Investments of a nature not contemplated in the foregoing clauses in an amount not to exceed $25 million in the aggregate
at any time outstanding. 
 Section 2. Representations and Warranties, No Default. Each of the Loan Parties hereby represents
and warrants that as of the effective date of this Amendment, (i) no Default or Event of Default exists and is continuing, and (ii) all representations and warranties contained in the Credit Agreement are true and correct in all material
respects on and as of the date hereof, as though made on and as of the date hereof, except to the extent that such representations and warranties specifically refer to an earlier date, in which case they were true and correct in all material
respects as of such earlier date. 
 Section 3. Effectiveness. This Amendment shall become effective on the date that the
following conditions have been satisfied: 
 3.1. Consents. The Administrative Agent shall have received
(a) signed consents to this Amendment from the Required Lenders, and (b) executed signature pages hereto from each Loan Party; 

 3.2. Fees and Expenses. Confirmation by the Administrative Agent of
(i) receipt by it of an amendment consent fee of one basis point (0.01%) on the loans and commitments of each of the Lenders consenting to this Amendment, and (ii) payment of all reasonable fees and expenses of the Administrative Agent in
connection with this Amendment that are due and payable on the date hereof (including the reasonable fees and expenses of Moore & Van Allen, PLLC, counsel to the Administrative Agent). 

Section 4. Guarantor Acknowledgment. Each Guarantor acknowledges and consents to all of the terms and conditions of this
Amendment, affirms its Guaranteed Obligations under and in respect of the Loan Documents and agrees that this Amendment and all documents executed in connection herewith do not operate to reduce or discharge any Guarantor’s obligations under
the Loan Documents, except as expressly set forth therein. 
 Section 5. Counterparts. This Amendment may be executed in any
number of counterparts and by different parties hereto on separate counterparts, each of which when so executed and delivered shall be deemed to be an original, but all of which when taken together shall constitute a single instrument. Delivery of
an executed counterpart of a signature page of this Amendment by facsimile or any other electronic transmission shall be effective as delivery of a manually executed counterpart hereof. 

Section 6. Applicable Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF
ILLINOIS. 
 Section 7. Expenses. The Borrower agrees to pay all reasonable costs and expenses of the Administrative Agent in
connection with the preparation, execution and delivery of this Amendment, including the reasonable fees and expenses of Moore & Van Allen PLLC. 

Section 8. Headings. The headings of this Amendment are for purposes of reference only and shall not limit or otherwise affect the
meaning hereof. 
 Section 9. Effect of Amendment. Except as expressly set forth herein, (i) this Amendment shall not by
implication or otherwise limit, impair, constitute a waiver of or otherwise affect the rights and remedies of the Lenders, the Administrative Agent, any other Agent, the Swing Line Lender or the L/C Issuer, in each case under the Credit Agreement or
any other Loan Document, and (ii) shall not alter, modify, amend or in any way affect any of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement or any other provision of either such agreement or any
other Loan Document. Except as expressly set forth herein, each and every term, condition, obligation, covenant and agreement contained in the Credit Agreement or any other Loan Document is hereby ratified and re-affirmed in all respects and shall
continue in full force and effect. Each Loan Party reaffirms its obligations under the Loan Documents to which it is party and the validity of the Liens granted by it pursuant to the Collateral Documents. This Amendment shall constitute a Loan
Document for purposes of the Credit Agreement and from and after the effective date hereof, all references to the Credit Agreement in any Loan Document and all references in the Credit Agreement to “this Agreement”, “hereunder”,
“hereof” or words of like import referring to the Credit Agreement, shall, unless expressly provided otherwise, refer to the Credit Agreement as amended by this Amendment. Each of the Loan Parties hereby consents to this Amendment and
confirms that all obligations of such Loan Party under the Loan Documents to which such Loan Party is a party shall continue to apply to the Credit Agreement as amended hereby. 

[Signature pages follow] 

  
 2 

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed as of the
date first above written. 
  

					
	BORROWER:	  	 	  	 HURON CONSULTING GROUP INC.,
 a Delaware
corporation
  
 By: /s/ C. Mark Hussey

Name: C. Mark Hussey
 Title: EVP, CFO and Treasurer

			
	 GUARANTORS:
	  		  	 HURON CONSULTING GROUP HOLDINGS LLC,
 a
Delaware limited liability company
  
 By: /s/ C. Mark Hussey

Name: C. Mark Hussey
 Title: EVP, CFO and Treasurer

			
		  		  	 HURON CONSULTING SERVICES LLC,
 a Delaware
limited liability company
  
 By: /s/ C. Mark Hussey

Name: C. Mark Hussey
 Title: EVP, CFO and Treasurer

			
		  		  	 HURON MANAGEMENT SERVICES LLC,
 formerly
known as WELLSPRING MANAGEMENT SERVICES
 LLC, a Delaware limited liability company
  

By: /s/ C. Mark Hussey
 Name: C. Mark Hussey

Title: EVP, CFO and Treasurer

			
		  		  	 HURON DEMAND LLC,
 a Delaware limited
liability company
  
 By: /s/ C. Mark Hussey

Name: C. Mark Hussey
 Title: EVP, CFO and Treasurer

			
		  		  	 HURON TECHNOLOGIES INC.,
 a Delaware
corporation
  
 By: /s/ C. Mark Hussey

Name: C. Mark Hussey
 Title: EVP, CFO and Treasurer

 AMENDMENT NO. 4 

HURON CONSULTING GROUP INC. 

					
			
		  		  	 LEGALSOURCE LLC,
 a Delaware limited
liability company
  
 By: /s/ C. Mark Hussey

Name: C. Mark Hussey
 Title: EVP, CFO and Treasurer

 AMENDMENT NO. 4 

HURON CONSULTING GROUP INC. 

					
			
	 ADMINISTRATIVE

AGENT:
	  		  	 BANK OF AMERICA, N.A.,
 as Administrative
Agent and Collateral Agent
  
 By: /s/ Maria A. McClain

Name: Maria A. McClain
 Title: Vice President

 AMENDMENT NO. 4 

HURON CONSULTING GROUP INC.

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