Exhibit 10.1

SECOND AMENDMENT

TO

SECOND AMENDED AND RESTATED

SENIOR REVOLVING CREDIT AGREEMENT

among

PETROHAWK ENERGY
CORPORATION,

as the Borrower,

BNP PARIBAS,

as Administrative Agent,

BANK OF AMERICA, N.A. and

BMO CAPITAL MARKETS FINANCING, INC.,

as Co-Syndication Agents,

JPMORGAN CHASE BANK, N.A.,

WELLS FARGO BANK, N.A. and

FORTIS CAPITAL CORP.

as Co-Documentation Agents,

and

THE LENDERS PARTY HERETO

Effective as of May 8, 2007



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SECOND AMENDMENT TO

SECOND AMENDED AND RESTATED SENIOR REVOLVING CREDIT AGREEMENT

This SECOND AMENDMENT TO SECOND
AMENDED AND RESTATED SENIOR REVOLVING CREDIT AGREEMENT (this Second Amendment) executed effective as of the 8th day of May, 2007 (the Second Amendment Effective Date) is among PETROHAWK ENERGY CORPORATION, a
corporation duly formed and existing under the laws of the State of Delaware (the Borrower); each of the Guarantors signatory hereto (the Guarantors); each of the Lenders from time to time party hereto; BNP
PARIBAS (in its individual capacity, BNP Paribas), as administrative agent for the Lenders (in such capacity, together with its successors in such capacity, the Administrative Agent); Bank of America, N.A. and
BMO Capital Markets Financing, Inc., as co-syndication agents for the Lenders (in such capacity, together with their successors in such capacity, the Co-Syndication Agents); and JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A.
and Fortis Capital Corp. as co-documentation agents for the Lenders (in such capacity, together with their successors in such capacity, the Co-Documentation Agents).

Recitals

A. The Borrower, the Administrative Agent, the other Agents and Lenders
named and defined therein as lenders and agents, are parties to that certain Second Amended and Restated Senior Revolving Credit Agreement dated as of July 12, 2006, as amended by the First Amendment to Second Amended and Restated Senior
Revolving Credit Agreement, dated as of July 24, 2006, pursuant to which such lenders and agents provided certain loans and extensions of credit to the Borrower (as amended, the Credit Agreement).

B. The Administrative Agent has requested, and the Borrower, the Administrative Agent, the Co-Syndication Agents, the Co-Documentation Agents and Lenders
have agreed to amend certain provisions of the Credit Agreement.

C. NOW, THEREFORE, in consideration of the premises and the mutual
covenants herein contained, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

Section 1. Defined Terms. Each capitalized term which is defined in the Credit Agreement, but which is not defined in this Second Amendment, shall have the meaning ascribed such term in the Credit Agreement.
Unless otherwise indicated, all section references in this Second Amendment refer to sections in the Credit Agreement.

Section 2.
Amendments to Credit Agreement.

2.1 Certain Defined Terms. The following defined terms in Section 1.02 are hereby
amended and restated in their entirety as follows:

Agreement means this Second Amended and Restated Senior Revolving
Credit Agreement, as amended by the First Amendment to Second Amended and Restated Senior Revolving Credit Agreement dated as of July 24, 2006 and the Second Amendment to Second Amended and Restated Senior Revolving Credit Agreement dated as of
May 8, 2007, as the same may from time to time be further amended, modified, supplemented or restated.



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2.2 Amendment to Section 8.01(n). Section 8.01(n) is hereby amended and restated in its
entirety as follows:

(n) Production Report and Lease Operating Statements. With the delivery of (i) Reserve Reports under
Section 8.12 and (ii) quarterly financial statements under Section 8.01(b) for the first and third fiscal quarters of each year, a report setting forth, for each calendar month during the then current fiscal year to date on a
production date basis, the volume of production and sales attributable to production (and the prices at which such sales were made and the revenues derived from such sales) for each such calendar month from the Oil and Gas Properties, and setting
forth the related ad valorem, severance and production taxes and lease operating expenses attributable thereto and incurred for each such calendar month.

2.3 Amendment to Section 9.04(b). Section 9.04(b) is hereby amended and restated in its entirety as follows:

(b) Redemption of Senior Unsecured Notes; Amendment of Senior Indentures. The Borrower will not, and will not permit any Restricted Subsidiary to, prior to the date that is ninety-one (91) days after the
Maturity Date: (i) call, make or offer to make any optional or voluntary Redemption of or otherwise optionally or voluntarily Redeem (whether in whole or in part) the Senior Unsecured Notes; provided that the Borrower may (A) prepay any
Senior Unsecured Notes and any premiums relating thereto with the Net Cash Proceeds of any sale of Equity Interests (other than Disqualified Capital Stock) of the Borrower, (B) Redeem or otherwise repurchase the outstanding 2011 Notes that were
not repurchased as part of the tender offer contemplated in Section 6.01(n), provided that (1) no Default or Event of Default has occurred and is continuing or would exist after giving effect to such Redemption or repurchase and
(2) after giving pro forma effect to any such Redemption or repurchase, the Borrower would have at least $100,000,000 of unused availability under the Commitments or (C) after July 16, 2007, prepay the 2012 Notes, provided that
(1) no Default or Event of Default has occurred and is continuing or would exist after giving effect to such Redemption or repurchase and (2) after giving pro forma effect to any such Redemption or repurchase, the Borrower would
have at least $50,000,000 of unused availability under the Commitments or (ii) amend, modify, waive or otherwise change, consent or agree to any amendment, supplement, modification, waiver or other change to, any of the terms of the Senior
Unsecured Notes or any Senior Indenture if (A) the effect thereof would be to shorten its maturity or average life or increase the amount of any payment of principal thereof or increase the rate or shorten any period for payment of interest
thereon, or (B) such action requires the payment of a consent fee (howsoever described), provided that the foregoing shall not prohibit the execution of supplemental indentures to add guarantors if required by the terms of any Senior Indenture
provided such Person complies with Section 8.14(b).



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2.4 Borrowing Base.

(a) Scheduled Redetermination. Pursuant to Section 2.07(b), each Lender consents to, the Scheduled Redetermination pursuant to which the Borrowing Base shall be increased to $750,000,000, effective from
May 1, 2007 to but excluding the next Redetermination Date. Notwithstanding the foregoing, the Borrowing Base may be subject to further adjustments from time to time pursuant to Section 8.13(c) or Section 9.13.

(b) Repayment of KCS Notes. If the Borrower from time to time redeems or prepays the 2012 Notes pursuant to Section 9.04(b)(ii)(C), then the
Borrowing Base, at the Borrowers option, shall be increased by $100 for every $275 of 2012 Notes so redeemed or repurchased.

(c)
Fees. For any and all increases in the Borrowing Base pursuant to Section 2.4(b) of this Second Amendment, the Borrower agrees to pay to the Administrative Agent, for the account of each Lender then party to the Agreement, ratably in
accordance with its Applicable Percentage, a Borrowing Base increase fee equal to 0.2% on the amount of any increase of the Borrowing Base over the Borrowing Base previously in effect, payable on the effective date of any such increase to the
Borrowing Base.

Section 3. Conditions Precedent. The effectiveness of this Second Amendment is subject to the receipt by the
Administrative Agent of the following documents and satisfaction of the other conditions provided in this Section 3, each of which shall be reasonably satisfactory to the Administrative Agent in form and substance:

3.1 The Administrative Agent and the Lenders shall have received all fees and other amounts due and payable on or prior to the Second Amendment Effective
Date, including, to the extent invoiced, reimbursement or payment of all out-of-pocket expenses required to be reimbursed or paid by the Borrower hereunder.

3.2 The Administrative Agent shall have received from the Administrative Agent, the Required Lenders and each of the Guarantors, counterparts (in such number as may be requested by the Administrative Agent) of this
Second Amendment signed on behalf of such Person.

3.3 No Default or Event of Default shall have occurred and be continuing as of the
Second Amendment Effective Date.

3.4 The Administrative Agent shall have received such other documents as the Administrative Agent or its
special counsel may reasonably require.

The Administrative Agent is hereby authorized and directed to declare this Second Amendment to be
effective when it has received documents confirming or certifying, to the satisfaction of the Administrative Agent, compliance with the conditions set forth in this Section 4 or the waiver of such conditions as permitted hereby. Such
declaration shall be final, conclusive and binding upon all parties to the Credit Agreement for all purposes.



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Section 4. Representations and Warranties; Etc. The Borrower and each Guarantor hereby affirms:
(a) that as of the date of execution and delivery of this Second Amendment, and after giving effect to the transactions contemplated hereby, all of the representations and warranties contained in each Loan Document to which it is a party are
true and correct in all material respects (unless made as of a specific earlier date, in which case, was true as of such date); and (b) that after giving effect to this Second Amendment and to the transactions contemplated hereby, no Defaults
exist under the Loan Documents or will exist under the Loan Documents.

Section 5. Miscellaneous.

5.1 Confirmation. The provisions of the Credit Agreement (as amended by this Second Amendment) shall remain in full force and effect in accordance
with its terms following the effectiveness of this Second Amendment.

5.2 Ratification and Affirmation of Borrower and Guarantors.
The Borrower and Guarantors hereby expressly (a) acknowledge the terms of this Second Amendment, (b) ratify and affirm their obligations under the Loan Documents to which they are a party, (c) acknowledge, renew and extend their
continued liabilities under the Guarantee Agreement and the other Security Instruments to which they are a party and agree that their guarantee under the Guarantee Agreement and the other Security Instruments to which they are a party remains in
full force and effect with respect to the Indebtedness as amended hereby.

5.3 Counterparts. This Second Amendment may be executed
by one or more of the parties hereto in any number of separate counterparts, and all of such counterparts taken together shall be deemed to constitute one and the same instrument.

5.4 No Oral Agreement. THIS WRITTEN SECOND AMENDMENT, THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS EXECUTED IN CONNECTION HEREWITH AND
THEREWITH REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR UNWRITTEN ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO SUBSEQUENT ORAL AGREEMENTS BETWEEN THE PARTIES.

5.5 Governing Law. THIS SECOND AMENDMENT (INCLUDING, BUT NOT LIMITED TO, THE VALIDITY AND ENFORCEABILITY HEREOF) SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF TEXAS.



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



|          |  |                              |  |                                                 
|--------- |  | ---------------------------- |  | ------------------------------------------------
|BORROWER: |  | PETROHAWK ENERGY CORPORATION
|          |  |                             
|          |  | By:                          |  | /s/ Shane M. Bayless                            
|          |  |                              |  | Shane M. Bayless                                
|          |  |                              |  | Executive Vice President-Chief Financial Officer



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|            |  |                                         |  |                                                  |  |                    
|----------- |  | --------------------------------------- |  | ------------------------------------------------ |  | -------------------
|GUARANTORS: |  | PETROHAWK OPERATING COMPANY            
|            | 
|            |  | P-H ENERGY, LLC                        
|            | 
|            |  | RED RIVER FIELD SERVICES, L.L.C.       
|            | 
|            |  | PETROHAWK PROPERTIES, LP               
|            |  |                                         |  | By:                                              |  | P-H Energy, L.L.C. 
|            |  |                                         |  |                                                  |  | Its General Partner
|            | 
|            |  | WINWELL RESOURCES, INC.                
|            | 
|            |  | WSF, INC.                              
|            | 
|            |  | KSC RESOURCES, INC.                    
|            | 
|            |  | KCS ENERGY SERVICES, INC.              
|            | 
|            |  | MEDALLION CALIFORNIA PROPERTIES COMPANY
|            | 
|            |  | PROLIQ, INC.                           
|            |  |                                        
|            |  | By:                                     |  | /s/ Shane M. Bayless                            
|            |  |                                         |  | Shane M. Bayless                                
|            |  |                                         |  | Executive Vice President-Chief Financial Officer



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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| |  |                         |  |                    
| |  | ----------------------- |  | -------------------
| |  | PETROHAWK HOLDINGS, LLC
| |  |                        
| |  | By:                     |  | /s/ Connie D. Tatum
| |  |                         |  | Connie D. Tatum    
| |  |                         |  | President          



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|                      |  |                         |  |                 
|--------------------- |  | ----------------------- |  | ----------------
|ADMINISTRATIVE AGENT: |  | BNP PARIBAS,           
|                      |  | as Administrative Agent
|                      |  |                        
|                      |  | By:                     |  | /s/ Robert Long 
|                      |  | Name:                   |  | Robert Long     
|                      |  | Title:                  |  | Vice President  
|                      |  |                        
|                      |  | By:                     |  | /s/ Russell Otts
|                      |  | Name:                   |  | Russell Otts    
|                      |  | Title:                  |  | Vice President  



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|                      |  |                                               |  |                        
|--------------------- |  | --------------------------------------------- |  | -----------------------
|CO-SYNDICATION AGENT: |  | BANK OF AMERICA, N.A.,as Co-Syndication Agent
|                      |  |                                              
|                      |  | By:                                           |  | /s/ Jeffrey H. Rathkamp
|                      |  | Name:                                         |  | Jeffrey H. Rathkamp    
|                      |  | Title:                                        |  | Managing Director      



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|                      |  |                                                             |  |                    
|--------------------- |  | ----------------------------------------------------------- |  | -------------------
|CO-SYNDICATION AGENT: |  | BMO CAPITAL MARKETS FINANCING, INC.,as Co-Syndication Agent
|                      |  |                                                            
|                      |  | By:                                                         |  | /s/ James V. Ducote
|                      |  | Name:                                                       |  | James V. Ducote    
|                      |  | Title:                                                      |  | Director           



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|                        |  |                                                     |  |                        
|----------------------- |  | --------------------------------------------------- |  | -----------------------
|CO-DOCUMENTATION AGENT: |  | JPMORGAN CHASE BANK, N.A.,as Co-Documentation Agent
|                        |  |                                                    
|                        |  | By:                                                 |  | /s/ Elizabeth K. Pavlas
|                        |  | Name:                                               |  | Elizabeth K. Pavlas    
|                        |  | Title:                                              |  | Vice President         



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|                        |  |                                                  |  |                       
|----------------------- |  | ------------------------------------------------ |  | ----------------------
|CO-DOCUMENTATION AGENT: |  | WELLS FARGO BANK, N.A.,as Co-Documentation Agent
|                        |  |                                                 
|                        |  | By:                                              |  | /s/ Stephanie B. Casas
|                        |  | Name:                                            |  | Stephanie B. Casas    
|                        |  | Title:                                           |  | Vice President        



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|                        |  |                                                |  |                      
|----------------------- |  | ---------------------------------------------- |  | ---------------------
|CO-DOCUMENTATION AGENT: |  | FORTIS CAPITAL CORP.,as Co-Documentation Agent
|                        |  |                                               
|                        |  | By:                                            |  | /s/ Scott Myatt      
|                        |  | Name:                                          |  | Scott Myatt          
|                        |  | Title:                                         |  | Vice President       
|                        |  |                                               
|                        |  | By:                                            |  | /s/ Deirdre Sanborn  
|                        |  | Name:                                          |  | Deirdre Sanborn      
|                        |  | Title:                                         |  | Senior Vice President



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |             |  |                 
|-------- |  | ----------- |  | ----------------
|LENDERS: |  | BNP PARIBAS
|         |  |            
|         |  | By:         |  | /s/ Robert Long 
|         |  | Name:       |  | Robert Long     
|         |  | Title:      |  | Vice President  
|         |  |            
|         |  | By:         |  | /s/ Russell Otts
|         |  | Name:       |  | Russell Otts    
|         |  | Title:      |  | Vice President  



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |                       |  |                        
|-------- |  | --------------------- |  | -----------------------
|LENDERS: |  | BANK OF AMERICA, N.A.
|         |  |                      
|         |  | By:                   |  | /s/ Jeffrey H. Rathkamp
|         |  | Name:                 |  | Jeffrey H. Rathkamp    
|         |  | Title:                |  | Managing Director      



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |                           |  |                        
|-------- |  | ------------------------- |  | -----------------------
|LENDERS: |  | JPMORGAN CHASE BANK, N.A.
|         |  |                          
|         |  | By:                       |  | /s/ Elizabeth K. Pavlas
|         |  | Name:                     |  | Elizabeth K. Pavlas    
|         |  | Title:                    |  | Vice President         



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |                        |  |                       
|-------- |  | ---------------------- |  | ----------------------
|LENDERS: |  | WELLS FARGO BANK, N.A.
|         |  |                       
|         |  | By:                    |  | /s/ Stephanie B. Casas
|         |  | Name:                  |  | Stephanie B. Casas    
|         |  | Title:                 |  | Vice President        



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |                                     |  |                    
|-------- |  | ----------------------------------- |  | -------------------
|LENDERS: |  | BMO CAPITAL MARKETS FINANCING, INC.
|         |  |                                    
|         |  | By:                                 |  | /s/ James V. Ducote
|         |  | Name:                               |  | James V. Ducote    
|         |  | Title:                              |  | Director           



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |                               |  |                      
|-------- |  | ----------------------------- |  | ---------------------
|LENDERS: |  | KEYBANK, NATIONAL ASSOCIATION
|         |  |                              
|         |  | By:                           |  | /s/ Thomas Rajan     
|         |  | Name:                         |  | Thomas Rajan         
|         |  | Title:                        |  | Senior Vice President



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |                           |  |                         
|-------- |  | ------------------------- |  | ------------------------
|LENDERS: |  | ALLIED IRISH BANKS P.L.C.
|         |  |                          
|         |  | By:                       |  | /s/ David ODriscoll    
|         |  | Name:                     |  | David ODriscoll        
|         |  | Title:                    |  | Assistant Vice President
|         |  |                          
|         |  | By:                       |  | /s/ Aidan Lanigan       
|         |  | Name:                     |  | Aidan Lanigan           
|         |  | Title:                    |  | Vice President          



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |                                 |  |                      
|-------- |  | ------------------------------- |  | ---------------------
|LENDERS: |  | AMEGY BANK NATIONAL ASSOCIATION
|         |  |                                
|         |  | By:                             |  | /s/ W. Bryan Chapman 
|         |  | Name:                           |  | W. Bryan Chapman     
|         |  | Title:                          |  | Senior Vice President



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |                      |  |                      
|-------- |  | -------------------- |  | ---------------------
|LENDERS: |  | FORTIS CAPITAL CORP.
|         |  |                     
|         |  | By:                  |  | /s/ Scott Myatt      
|         |  | Name:                |  | Scott Myatt          
|         |  | Title:               |  | Vice President       
|         |  |                     
|         |  | By:                  |  | /s/ Deirdre Sanborn  
|         |  | Name:                |  | Deirdre Sanborn      
|         |  | Title:               |  | Senior Vice President



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |               |  |                
|-------- |  | ------------- |  | ---------------
|LENDERS: |  | SUNTRUST BANK
|         |  |              
|         |  | By:           |  | /s/ Peter Panos
|         |  | Name:         |  | Peter Panos    
|         |  | Title:        |  | Vice President 



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |                     |  |                         
|-------- |  | ------------------- |  | ------------------------
|LENDERS: |  | BANK OF TEXAS, N.A.
|         |  |                    
|         |  | By:                 |  | /s/ Mari Salazar        
|         |  | Name:               |  | Mari Salazar            
|         |  | Title:              |  | Assistant Vice President



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |                                |  |                        
|-------- |  | ------------------------------ |  | -----------------------
|LENDERS: |  | U.S. BANK NATIONAL ASSOCIATION
|         |  |                               
|         |  | By:                            |  | /s/ Justin M. Alexander
|         |  | Name:                          |  | Justin M. Alexander    
|         |  | Title:                         |  | Vice President         



Second Amendment  Second Amended and Restated Senior Revolving Credit Agreement

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|         |  |               |  |                 
|-------- |  | ------------- |  | ----------------
|LENDERS: |  | COMERICA BANK
|         |  |              
|         |  | By:           |  | /s/ Huma Vadgama
|         |  | Name:         |  | Huma Vadgama    
|         |  | Title:        |  | Vice President  



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|         |  |              |  |                       
|-------- |  | ------------ |  | ----------------------
|LENDERS: |  | COMPASS BANK
|         |  |             
|         |  | By:          |  | /s/ Patrick McWilliams
|         |  | Name:        |  | Patrick McWilliams    
|         |  | Title:       |  | Vice President        



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|         |  |               |  |                         
|-------- |  | ------------- |  | ------------------------
|LENDERS: |  | STERLING BANK
|         |  |              
|         |  | By:           |  | /s/ Ryan K. Michael     
|         |  | Name:         |  | Ryan K. Michael         
|         |  | Title:        |  | Assistant Vice President



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