Document:

<PAGE>

                                                                    Exhibit 4.14

                    FOURTH SUPPLEMENTAL SENIOR NOTE INDENTURE

     FOURTH SUPPLEMENTAL SENIOR NOTE INDENTURE (this "Supplemental Senior Note
Indenture"), dated as of February 16, 2000 among Peabody Natural Gas, LLC, a
Delaware limited liability company (the "Guaranteeing Subsidiary"), a subsidiary
of Peabody Holding Company, Inc. (or its permitted successor), a New York
corporation (the "Company") the Company, the other Senior Note Guarantors (as
defined in the Senior Note Indenture referred to herein) and State Street Bank
and Trust Company, as Senior Note Trustee under the Senior Note Indenture
referred to below (the "Senior Note Trustee").

     WHEREAS, the Company has heretofore executed and delivered to the Senior
Note Trustee a Senior Note Indenture (the "Senior Note Indenture"), dated as of
May 18, 1998 providing for the issuance of an aggregate principal amount of up
to $550.0 million of 8-7/8% Senior Notes due 2008 (the "Senior Notes")

     WHEREAS, the Senior Note Indenture provides that under certain
circumstances the Guaranteeing Subsidiary shall execute and deliver to the
Senior Note Trustee a supplemental Senior Note Indenture pursuant to which the
Guaranteeing Subsidiary shall unconditionally guarantee all of the Company's
Obligations under the Senior Notes and the Senior Note Indenture oil the terms
and conditions set forth herein (the "Senior Subsidiary Guarantee"); and

     WHEREAS, pursuant to Section 9.01 of the Senior Note Indenture, the Senior
Note Trustee is authorized to execute and deliver this Supplemental Senior Note
Indenture. NOW THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the
Guaranteeing Subsidiary and the Senior Note Trustee mutually covenant and agree
for the equal and ratable benefit of the Holders of the Senior Notes as follows:

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

     2. AGREEMENT TO GUARANTEE.  The  Guaranteeing  Subsidiary  hereby agrees as
follows:

          (a) Along with all Senior Note Guarantors named in the Senior Note
     Indenture, to jointly and severally Guarantee to each Holder of a Senior
     Note authenticated and delivered by the Senior Note Trustee and to the
     Senior Note Trustee and its successors and assigns, of the validity and
     enforceability of the Senior Note Indenture the Senior Notes or the

<PAGE>

     obligations or the Company hereunder or thereunder that:

               (i) the principal of and interest on the Senior Notes will be
          promptly paid in full when due, whether at maturity, by acceleration,
          redemption or otherwise, and interest on the overdue principal and
          interest on the Senior Notes, if any, if lawful, and all other
          obligations of the Company to the Holders or the Senior

          Note Trustee hereunder or thereunder will be promptly paid in full or
          performed all in accordance with the terms hereof and thereof, and

               (ii) in case of any extension of time of payment or renewal of
          any Senior Notes or any of such other obligations, that same will be
          promptly paid in full when due or performed in accordance with the
          terms of the extension or renewal, whether at stated maturity, by
          acceleration or otherwise. Failing payment when due of any amount so
          guaranteed or any performance so guaranteed for whatever reason, the
          Senior Note Guarantors shall be jointly and severally obligated to pay
          the same immediately.

          (b) The obligations hereunder shall be unconditional, irrespective of
     the validity, regularity or enforceability of the Senior Notes or the
     Senior Note Indenture, the absence of any action to enforce the same, any
     waiver or consent by any Holder of the Senior Notes with respect to any
     provisions hereof or thereof, the recovery of any judgment against the
     Company, any action to enforce the same or any other circumstance which
     might otherwise constitute a legal or equitable discharge or defense of a
     Senior Note Guarantor.

          (c) The following is hereby waived: diligence presentment, demand of
     payment, filing of claims with a court in the event of insolvency or
     bankruptcy of the Company, any right to require a proceeding first against
     the Company, protest, notice and all demands whatsoever.

          (d) This Senior Subsidiary Guarantee shall not be discharged except by
     complete performance of the obligations contained in the Senior Notes and
     the Senior Note Indenture.

          (e) If any Holder or the Senior Note Trustee is required by any court
     or otherwise to return to the Company, the Senior Note Guarantors, or any
     custodian, Senior Note Trustee, liquidator or other similar official acting
     in relation to either the Company or the Senior Note Guarantors, any amount
     paid by either to the Senior Note Trustee or such Holder, this Senior
     Subsidiary Guarantee, to the extent theretofore discharged, shall be
     reinstated in full force and effect.

          (f) The Guaranteeing Subsidiary shall not be entitled to any right of
     subrogation in relation to the Holders in respect of any obligations
     guaranteed hereby until payment in full of all obligations guaranteed
     hereby.

          (g) As between the Senior Note Guarantors, on the one hand, and the
     Holders and the Senior Note Trustee, on the other hand, (x) the maturity of
     the obligations guaranteed hereby may be accelerated as provided in Article
     6 of the Senior Note Indenture for the purposes of this Senior Subsidiary
     Guarantee, notwithstanding any stay, injunction or other prohibitions
     preventing such acceleration in respect of the obligations guaranteed
     hereby, and (y) in the event any declaration of acceleration of such
     obligations as provided in Article 6 of the Senior Note Indenture, such
     obligations (whether or not due and payable) shall forthwith become due and
     payable by the Senior Note Guarantors for the purpose of this Senior
     Subsidiary Guarantee.

          (h) The Senior Note Guarantors shall have the right to seek

<PAGE>

     contribution from any non-paying Senior Note Guarantor so long as the
     exercise of such right does not impair the rights of the Holders under the
     Senior Subsidiary Guarantee.

          (i) Pursuant to Section 10.04 of the Senior Note Indenture, after
     giving effect to any maximum amount and any other contingent and fixed
     liabilities that are relevant under any applicable Bankruptcy or fraudulent
     conveyance laws, and after giving effect to any collections from, rights to
     receive contribution from or payments made by or on behalf of any other
     Senior Note Guarantor in respect of the obligations of such other Senior
     Note Guarantor under Article 10 of the Senior Note Indenture shall result
     in the obligations of such Senior Note Guarantor under its Senior
     Subsidiary Guarantee not constituting a fraudulent transfer or conveyance.

     3. EXECUTION AND DELIVERY. Each Guaranteeing Subsidiary agrees that the
Senior Subsidiary Guarantees shall remain in full force and effect
notwithstanding any failure to endorse on each Senior Note a notation of such
Senior Subsidiary Guarantee.

     4. GUARANTEEING SUBSIDIARY MAY CONSOLIDATE, ETC. ON CERTAIN TERMS.

          (a) The Guaranteeing Subsidiary may not consolidate with or merge with
     or into (whether or not such Senior Note Guarantor is the surviving Person)
     another corporation, Person or entity whether or not affiliated with such
     Senior Note Guarantor unless:

               (i) subject to Section 10.04 of the Senior Note Indenture, the
          Person formed by or surviving any such consolidation or merger (if
          other than a Senior Note Guarantor or the Company) unconditionally
          assumes all the obligations of such Senior Note Guarantor, pursuant to
          a supplemental Senior Note Indenture in form and substance reasonably
          satisfactory to the Senior Note Trustee, under the Senior Notes, the
          Senior Note Indenture and the Senior Subsidiary Guarantee on the terms
          set forth herein or therein; and

               (ii) immediately after giving effect to such transaction, no
          Default or Event of Default exists.

          (b) In case of any such consolidation, merger, sale or conveyance and
     upon the assumption by the successor corporation, by supplemental Senior
     Note Indenture, executed and delivered to the Senior Note Trustee and
     satisfactory in form to the Senior Note Trustee, of the Senior Subsidiary
     Guarantee endorsed upon the Senior Notes and the due and punctual
     performance of all of the covenants and conditions of the Senior Note
     Indenture to be performed by the Senior Note Guarantor, such successor
     corporation shall succeed to and be substituted for the Senior Note
     Guarantor with the same effect as if it had been named herein as a Senior
     Note Guarantor. Such successor corporation thereupon may cause to be signed
     any or all of the Senior Subsidiary Guarantees to be endorsed upon all of
     the Senior Notes issuable hereunder which theretofore shall not have been
     signed by the Company and delivered to the Senior Note Trustee. All the
     Senior Subsidiary Guarantees so issued shall in all respects have the same
     legal rank and benefit under the Senior Note Indenture as the Senior
     Subsidiary Guarantees theretofore and thereafter issued in accordance with
     the terms of the Senior Note Indenture as though all of such Senior
     Subsidiary Guarantees had been issued at the date of the execution hereof,

          (c) Except as set forth in Articles 4 and 5 of the Senior Note
     Indenture, and notwithstanding clauses (a) and (b) above, nothing contained
     in the Senior Note Indenture or in any of the Senior Notes shall prevent
     any consolidation or merger of a Senior Note Guarantor with or into the
     Company or another Senior Note Guarantor, or shall prevent any sale or

<PAGE>

     conveyance of the property of a Senior Note Guarantor as an entirety or
     substantially as an entirety to the Company or another Senior Note
     Guarantor.

     5. RELEASES.

          (a) In the event of a sale or other disposition of all of the assets
     of any Senior Note Guarantor, by way of merger, consolidation or otherwise,
     or a sale or other disposition of all to the capital stock of any Senior
     Note Guarantor, then such Senior Note Guarantor (in the event of a sale or
     other disposition, by way of merger, consolidation or otherwise, of all of
     the capital stock of such Senior Note Guarantor) or the corporation
     acquiring the property (in the event of a sale or other disposition of all
     or substantially all of the assets of such Senior Note Guarantor) will be
     released and relieved of any obligations under its Senior Subsidiary
     Guarantee; provided that the Net Proceeds of such sale or other disposition
     are applied in accordance with the applicable provisions of the Senior Note
     Indenture, including without limitation Section 4.10 of the Senior Note
     Indenture. Upon delivery by the Company to the Senior Note Trustee of an
     Officers' Certificate and an Opinion of Counsel to the effect that such
     sale or other disposition was made by the Company in accordance with the
     provisions of the Senior Note Indenture, including without limitation
     Section 4. 10 of the Senior Note Indenture, the Senior Note Trustee shall
     execute any documents reasonably required in order to evidence the release
     of any Senior Note Guarantor from its obligations under its Senior
     Subsidiary Guarantee.

          (b) Any Senior Note Guarantor not released from its obligations under
     its Senior Subsidiary Guarantee shall remain liable for the full amount of
     principal of and interest on the Senior Notes and for the other obligations
     of any Senior Note Guarantor under the Senior Note Indenture as provided in
     Article 10 of the Senior Note Indenture.

     6. NO RECOURSE AGAINST OTHERS. No past, present or future director,
officer, employee, incorporator, stockholder or agent of the Guaranteeing
Subsidiary, as such, shall have any liability for any obligations of the Company
or any Guaranteeing Subsidiary under the Senior Notes, any Senior Subsidiary
Guarantees, the Senior Note Indenture or this Supplemental Senior Note Indenture
or for any claim based on, in respect of, or by reason of, such obligations or
their creation Each Holder of the Senior Notes by accepting a Senior Note waives
and releases all such liability. The waiver and release are part of the
consideration for issuance of the Senior Notes. Such waiver may not be effective
to waive liabilities under the federal securities laws and it is the view of the
Commission that such a waiver is against public policy.

     7. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL
GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL SENIOR NOTE INDENTURE BUT
WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT
THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED
THEREBY.

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

     9. EFFECT OF HEADINGS. The Section headings herein are for convenience only
and shall not affect the construction hereof.

     10. THE SENIOR NOTE TRUSTEE. The Senior Note Trustee shall not be
responsible in any manner whatsoever for or in respect of the validity or
sufficiency of this Supplemental Senior Note Indenture or for or in respect of
the recitals contained herein, all of which recitals are made solely by the
Guaranteeing Subsidiary and the Company.

<PAGE>

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

Dated: February 16, 2000

                                   PEABODY NATURAL GAS, LLC

                                   By:  /s/ S. F. Schaab
                                      -----------------------------------------
                                   Name: S. F. Schaab
                                   Title: Vice President & Treasurer<PAGE>

                                                                    Exhibit 4.15

                    FIFTH SUPPLEMENTAL SENIOR NOTE INDENTURE

     FIFTH SUPPLEMENTAL SENIOR NOTE INDENTURE dated as of March 27, 2000 (this
"Supplemental Senior Note Indenture") among P&L Coal Holdings Corporation, a
Delaware corporation (the "Company"), each Senior Note Guarantor (as defined in
the Senior Note Indenture referred to herein) and State Street Bank and Trust
Company, as Senior Note Trustee under the Senior Note Indenture referred to
below (the "Senior Note Trustee").

                               W I T N E S S E T H

     WHEREAS, the Company has heretofore executed and delivered to the Senior
Note Trustee a Senior Note Indenture dated as of May 18, 1998 (the "Senior Note
Indenture") providing for the issuance of an aggregate principal amount of up to
$550.0 million of 8-7/8% Senior Notes due 2008 (the "Senior Notes");

     WHEREAS, the Company desires to clarify the definition of "Lien" in Section
1.01 of the Senior Note Indenture;

     WHEREAS, Section 9.01 of the Senior Note Indenture provides that the
Company, the Senior Note Guarantors and the Senior Note Trustee may enter into a
supplemental indenture, without the consent of any Holders, for the purpose of
curing any ambiguity, defect or inconsistency or for the purpose of making any
change that does not adversely affect the Holders of the Senior Notes;

     NOW, THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt of which is hereby acknowledged, the
Company, the Senior Note Guarantors and the Senior Note Trustee hereby agree as
follows:

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

     2. Amendment to Senior Note Indenture. The definition of "Lien" in Section
        ----------------------------------
1.01 of the Senior Note Indenture is hereby amended by inserting the following
clause at the end thereof: ", but excluding any of the foregoing arising as a
result of a sale, contribution, disposition or other transfer of accounts,
chattel paper, payment intangibles, promissory notes and/or related assets
otherwise permitted under the terms hereof".

     3. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL
        ----------------------
GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL SENIOR NOTE INDENTURE BUT
WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT
THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED
THEREBY.

<PAGE>

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

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

     6. The Senior Note Trustee. The Senior Note Trustee shall not be
        -----------------------
responsible in any manner whatsoever for or in respect of the validity or
sufficiency of this Supplemental Senior Note Indenture or for or in respect of
the recitals contained herein, all of which recitals are made solely by the
Company and the Senior Note Guarantors.

                                        2

<PAGE>

     IN WITNESS WHEREOF, the parties have caused this Supplemental Senior Note
Indenture to be duly executed as of the date and year first above written.

                                P&L COAL HOLDINGS CORPORATION

                                By:  /s/ J.L. Klinger
                                     ------------------------------------
                                     Name:  J.L. Klinger
                                     Title: Vice President-Legal Services
                                            and Secretary

                                STATE STREET BANK AND TRUST
                                COMPANY, as Trustee

                                By:  /s/ Philip G. Kane, Jr.
                                     ------------------------------------
                                     Name:  Philip G. Kane, Jr.
                                     Title: Vice President

                                AFFINITY MINING COMPANY

                                By:  /s/ J.C. Klingl
                                     ------------------------------------
                                     Name:  J.C. Klingl
                                     Title: Vice President and Treasurer

                                ARID OPERATIONS INC.

                                By:  /s/ Steven F. Schaab
                                     ------------------------------------
                                     Name:  S. F. Schaab
                                     Title: Vice President and Treasurer

                                BIG SKY COAL COMPANY

                                By:  /s/ J.C. Klingl
                                     ------------------------------------
                                     Name:  J.C. Klingl
                                     Title: Vice President and Treasurer

                                BLACKROCK FIRST CAPITAL CORPORATION

                                By:  /s/ J.C. Sevem
                                     ------------------------------------
                                     Name:  J.C. Sevem
                                     Title: Vice President

<PAGE>

                                BLUEGRASS COAL COMPANY

                                     /s/ Steven F. Schaab
                                By:  ------------------------------------
                                     Name:   S.F. Schaab
                                     Title:  Vice President and Treasurer

                                CABALLO COAL COMPANY

                                     /s/ Steve F. Schaab
                                By:  ------------------------------------
                                     Name:   S.F. Schaab
                                     Title:  Vice President and Treasurer

                                CHARLES COAL COMPANY

                                     /s/ J.C. Sevem
                                By:  ------------------------------------
                                     Name:   J.C. Sevem
                                     Title:  Vice President

                                COAL PROPERTIES CORP.

                                     /s/ Steven F. Schaab
                                By:  ------------------------------------
                                     Name:   S.F. Schaab
                                     Title:  Vice President and Treasurer

                                COLONY BAY COAL COMPANY

                                By:  Charles Coal Company

                                     /s/ J.C. Sevem
                                By:  ------------------------------------
                                     Name:   J.C. Sevem
                                     Title:  Vice President

                                        4

<PAGE>

                                COOK MOUNTAIN COAL COMPANY

                                     /s/ Steven F. Schaab
                                By:  ------------------------------------
                                     Name:   S.F. Schaab
                                     Title:  Vice President and Treasurer

                                COTTONWOOD LAND COMPANY

                                     /s/ Steven F. Schaab
                                By:  ------------------------------------
                                     Name:   S.F. Schaab
                                     Title:  Vice President and Treasurer

                                EACC CAMPS, INC.

                                     /s/ J.C. Sevem
                                By:  ------------------------------------
                                     Name:   J.C. Sevem
                                     Title:  Vice President

                                EASTERN ASSOCIATED COAL CORP.

                                     /s/ Steven F. Schaab
                                By:  ------------------------------------
                                     Name:   S.F. Schaab
                                     Title:  Vice President and Treasurer

                                EASTERN ROYALTY CORP.

                                     /s/ J.C. Sevem
                                By:  ------------------------------------
                                     Name:   J.C. Sevem
                                     Title:  Vice President

                                GOLD FIELDS CHILE, S.A.

                                     /s/ Steven F. Schaab
                                By:  ------------------------------------
                                     Name:   S.F. Schaab
                                     Title:  Vice President

                                        5

<PAGE>

                                GOLD FIELDS MINING CORPORATION

                                        /s/ Steven F. Schaab
                                By:  -------------------------------
                                     Name:  S. F. Schaab
                                     Title: Vice President and Treasurer

                                GOLD FIELDS OPERATING CO.-ORTIZ

                                        /s/ Steven F. Schaab
                                By:  ------------------------------
                                     Name:  S. F. Schaab
                                     Title: Vice President and Treasurer

                                GRAND EAGLE MINING, INC.

                                        /s/ Steven F. Schaab
                                By:  ------------------------------
                                     Name:  S. F. Schaab
                                     Title: Vice President

                                HAYDEN GULCH TERMINAL, INC.

                                        /s/ Steven F. Schaab
                                By:  ------------------------------
                                     Name:  S. F. Schaab
                                     Title: Vice President

                                HIGHLAND MINING COMPANY

                                        /s/ J.C. Klingl
                                By:  ------------------------------
                                     Name:  J.C. Klingl
                                     Title: Vice President

                                INDEPENDENCE MATERIAL HANDLING COMPANY

                                        /s/ Steven F. Schaab
                                By:  ------------------------------
                                     Name:  S. F. Schaab
                                     Title: Vice President and Treasurer

                                        6

<PAGE>

                                INTERIOR HOLDINGS CORP.

                                By:  /s/ Steven F. Schaab
                                     ------------------------------------
                                     Name:  S.F. Schaab
                                     Title: Vice President and Treasurer

                                JAMES RIVER COAL TERMINAL COMPANY

                                By:  /s/ Steven F. Schaab
                                     ------------------------------------
                                     Name:  S.F. Schaab
                                     Title: Vice President and Treasurer

                                JUNIPER COAL COMPANY

                                By:  /s/ Steven F. Schaab
                                     ------------------------------------
                                     Name:  S.F. Schaab
                                     Title: Vice President and Treasurer

                                KAYENTA MOBILE HOME PARK, INC.

                                By:  /s/ Doug A. Wagner
                                     ------------------------------------
                                     Name:  D.A. Wagner
                                     Title: President

                                MARTINKA COAL COMPANY

                                By:  /s/ J.C. Klingl
                                     ------------------------------------
                                     Name:  J.C. Klingl
                                     Title: Vice President

                                        7

<PAGE>

                       MIDCO SUPPLY AND EQUIPMENT CORPORATION

                       By:  /s/ Steven F. Schaab
                            -------------------------------
                            Name:  S.F. Schaab
                            Title: Vice President and Treasurer

                       MOUNTAIN VIEW COAL COMPANY

                       By:  /s/ J.C. Klingl
                            -------------------------------
                            Name:  J.C. Klingl
                            Title: Vice President

                       NORTH PAGE COAL CORP.

                       By:  /s/ J.C. Sevem
                            -------------------------------
                            Name:  J.C. Sevem
                            Title: Vice President

                       OHIO COUNTY COAL COMPANY

                       By:  /s/ Steven F. Schaab
                            -------------------------------
                            Name:  S.F. Schaab
                            Title: Vice President and Treasurer

                       PATRIOT COAL COMPANY L.P.
                                By:  Bluegrass Coal Company

                       By:  /s/ Steven F. Schaab
                            -------------------------------
                            Name:  S.F. Schaab
                            Title: Vice President and Treasurer

                       PEABODY AMERICA, INC.

                       By:  /s/ J.L. Klinger
                            -------------------------------
                            Name:  J.L. Klinger
                            Title: Vice President and Assistant Secretary

                                        8

<PAGE>

                      PEABODY COALSALES COMPANY

                      By:  /s/ J.C. Sevem
                           ------------------------------
                           Name:  J.C. Sevem
                           Title: Secretary

                      PEABODY COALTRADE, INC.

                      By:  /s/ Steven F. Schaab
                           ------------------------------
                           Name:  S.F. Schaab
                           Title: Vice President and Treasurer

                      PEABODY COAL COMPANY

                      By:  /s/ J.L. Klinger
                           ------------------------------
                           Name:  J.L. Klinger
                           Title: Vice President and Assistant Secretary

                      PEABODY DEVELOPMENT COMPANY

                      By:  /s/ Steven F. Schaab
                           ------------------------------
                           Name:  S.F. Schaab
                           Title: Vice President and Treasurer

                      PEABODY ENERGY SOLUTIONS, INC.

                      By:  /s/ Steven F. Schaab
                           ------------------------------
                           Name:  S.F. Schaab
                           Title: Vice President and Treasurer

                      PEABODY HOLDING COMPANY, INC.

                      By:  /s/ Steven F. Schaab
                           ------------------------------
                           Name:  S.F. Schaab
                           Title: Vice President and Treasurer

                              9

<PAGE>

                      PEABODY NATURAL RESOURCES COMPANY
                               By:  Gold Fields Mining Corporation

                      By:  /s/ Steven F. Schaab
                           -------------------------------
                           Name:  S.F. Schaab
                           Title: Vice President

                      PEABODY SOUTHWESTERN COAL COMPANY

                      By:  /s/ Steven F. Schaab
                           -------------------------------
                           Name:  S.F. Schaab
                           Title: Vice President and Assistant Treasurer

                      PEABODY TERMINALS, INC.

                      By:  /s/ Steven F. Schaab
                           -------------------------------
                           Name:  S.F. Schaab
                           Title: Vice President

                      PEABODY VENEZUELA COAL CORP.

                      By:  /s/ Steven F. Schaab
                           -------------------------------
                           Name:  S.F. Schaab
                           Title: Vice President

                      PEABODY WESTERN COAL COMPANY

                      By:  /s/ J.C. Klingl
                           -------------------------------
                           Name:  J.C. Klingl
                           Title: Vice President

                                       10

<PAGE>

                                PINE RIDGE COAL COMPANY

                                By:  /s/ J.C. Klingl
                                     ------------------------------------
                                     Name:  J.C. Klingl
                                     Title: Vice President

                                POWDER RIVER COAL COMPANY

                                By:  /s/ Steven F. Schaab
                                     ------------------------------------
                                     Name:  S.F. Schaab
                                     Title: Vice President and Treasurer

                                RIO ESCONDIDO COAL CORP.

                                By:  /s/ Steven F. Schaab
                                     ------------------------------------
                                     Name:  S.F. Schaab
                                     Title: Vice President

                                SENECA COAL COMPANY

                                By:  /s/ J.C. Klingl
                                     ------------------------------------
                                     Name:  J.C. Klingl
                                     Title: Vice President

                                SENTRY MINING COMPANY

                                By:  /s/ Steven F. Schaab
                                     ------------------------------------
                                     Name:  S.F. Schaab
                                     Title: Vice President and Treasurer

                                SNOWBERRY LAND COMPANY

                                By:  /s/ Steven F. Schaab
                                     ------------------------------------
                                     Name:  S.F. Schaab
                                     Title: Vice President and Treasurer

                                       11

<PAGE>

                                STERLING SMOKELESS COAL COMPANY

                                By:  /s/ T.L. Bethel
                                     ------------------------------------
                                     Name:  T.L. Bethel
                                     Title: Vice President and Treasurer

                                THOROUGHBRED, L.L.C.
                                     By:  Peabody Holding Company, Inc.

                                By:  /s/ Steven F. Schaab
                                     ------------------------------------
                                     Name:  S.F. Schaab
                                     Title: Vice President and Treasurer

                                       12

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