EXHIBIT 5 SIMPSON THACHER & BARTLETT LLP 425 LEXINGTON AVENUE NEW YORK, N.Y. 10017-3954 (212) 455-2000 June 17, 2003 Peabody Energy Corporation 710 Market Street St. Louis, Missouri 63101-1826 Ladies and Gentlemen: We have acted as counsel to Peabody Energy Corporation, a Delaware corporation (the "Company"), and to the Delaware subsidiaries of the Company named on Schedule I attached hereto (each, a "Delaware Guarantor" and collectively, the "Delaware Guarantors") and to the non-Delaware subsidiaries of the Company named on Schedule II attached hereto (each, a "Non-Delaware Guarantor" and collectively, the "Non-Delaware Guarantors," together with the Delaware Guarantors, the "Guarantors"), in connection with the Registration Statement on Form S-4 (the "Registration Statement") filed by the Company and the Guarantors with the Securities and Exchange Commission (the "Commission") under the Securities Act of 1933, as amended, relating to the issuance by the Company of $650,000,000 aggregate principal amount of 6 7/8% Senior Notes Due 2013 (the "Exchange Notes") and the issuance by the Guarantors of guarantees (the "Guarantees"), with respect to the Exchange Notes. The Exchange Notes and the Guarantees will be issued under an indenture dated as of March 21, 2003 (the "Indenture") among the Company, certain of the Guarantors and US Bank National Association, as trustee (the "Trustee"), as supplemented by a first supplemental indenture dated as of May 7, 2003 (the "Supplemental Indenture") among the Company, the Guarantors and the Trustee. The Exchange Notes will be offered by the Company in exchange for $650,000,000 aggregate principal amount of its outstanding 6 7/8% Senior Notes Due 2013. We have examined the Registration Statement, the Indenture, which has been filed with the Commission as an exhibit to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2003, and the Supplemental Indenture, which has been filed as an exhibit to the Registration Statement. We also have examined the originals, or duplicates or certified or conformed copies, of such records, agreements, instruments and other documents and have made such other and further investigations as we have deemed relevant and necessary in connection with the opinions expressed herein. As to questions of fact material to this opinion, we have relied upon certificates of public officials and of officers and representatives of the Company and the Guarantors. In rendering the opinions set forth below, we have assumed the genuineness of all signatures, the legal capacity of natural persons, the due incorporation of the Non-Delaware Guarantors, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as duplicates or certified or conformed copies, and the authenticity of the originals of such latter documents. We also have assumed that the Indenture is the valid and legally binding obligation of the Trustee. We have assumed further that (a) the Non-Delaware Guarantors have duly authorized, executed and delivered the 2 Indenture, (b) execution, delivery and performance by the Non-Delaware Guarantors of the Indenture, the Exchange Notes and the Guarantees do not and will not violate the laws of the respective jurisdictions of organization of the Non-Delaware Guarantors or any other applicable laws (excepting the laws of the State of New York and the Federal laws of the United States) and (c) each of the Non-Delaware Guarantors is validly existing under the laws of their respective jurisdiction of organization. Based upon the foregoing, and subject to the qualifications and limitations stated herein, we are of the opinion that: 1. When the Exchange Notes have been duly executed, authenticated, issued and delivered in accordance with the provisions of the Indenture upon the exchange, the Exchange Notes will constitute valid and legally binding obligations of the Company enforceable against the Company in accordance with their terms. 2. When (a) the Exchange Notes have been duly executed, authenticated, issued and delivered in accordance with the provisions of the Indenture upon the exchange and (b) the Guarantees have been duly endorsed on the Exchange Notes, the Guarantees will constitute valid and legally binding obligations of the Guarantors enforceable against the Guarantors in accordance with their terms. Our opinions set forth above are subject to the effects of (1) bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and other similar laws relating to or affecting creditors' rights generally, (2) general equitable principles (whether considered in a proceeding in equity or at law) and (3) an implied covenant of good faith and fair dealing. We are members of the Bar of the State of New York and we do not express any opinion herein concerning any law other than the law of the State of New York, the Federal law of the United States, the Delaware General Corporation Law and the Delaware Revised Uniform Limited Partnership Act. 3 We hereby consent to the filing of this opinion letter as Exhibit 5 to the Registration Statement and to the use of our name under the caption "Legal Matters" in the Prospectus included in the Registration Statement. Very truly yours, /s/ SIMPSON THACHER & BARTLETT LLP ----------------------------------- SIMPSON THACHER & BARTLETT LLP 4 SCHEDULE I Arid Operations Inc. Beaver Dam Coal Company Big Sky Coal Company Black Beauty Holding Company, LLC Black Walnut Coal Company Bluegrass Coal Company Caballo Coal Company Charles Coal Company Cleaton Coal Company Coal Properties Corp. Colony Bay Coal Company Cook Mountain Coal Company Cottonwood Land Company Cyprus Creek Land Company Cyprus Creek Land Resources, LLC Eastern Royalty Corp. Gallo Finance Company Gold Fields Chile, S.A. Gold Fields Mining Corporation Gold Fields Operating Co.-Ortiz Hayden Gulch Terminal, Inc Highland Mining Company Highwall Mining Services Company Independence Material Handling Company Interior Holdings Corp. James River Coal Terminal Company Jarrell's Branch Coal Company Juniper Coal Company Kayenta Mobile Home Park, Inc. Logan Fork Coal Company Martinka Coal Company Mountain View Coal Company Mustang Energy Company, L.L.C. Patriot Coal Company, L.P. Peabody America, Inc. Peabody Archveyor, L.L.C. Peabody COALSALES Company Peabody COALTRADE, Inc. Peabody Coal Company Peabody Development Company Peabody Development Land Holdings, L.L.C. Peabody Energy Generation Holding Company Peabody Energy Investments, Inc. Peabody Energy Solutions, Inc. Peabody Natural Gas, LLC Peabody Natural Resources Company Peabody Recreational Lands, L.L.C. Peabody Southwestern Coal Company Peabody Terminals, Inc. Peabody Venezuela Coal Corp. Peabody-Waterside Development, L.L.C. Peabody Western Coal Company Pine Ridge Coal Company Pond Creek Land Resources, LLC Pond River Land Company Porcupine Production, LLC Porcupine Transportation, LLC Powder River Coal Company Prairie State Generating Company, LLC Rio Escondido Coal Corp. Rivers Edge Mining, Inc. Riverview Terminal Company Seneca Coal Company Sentry Mining Company Snowberry Land Company Star Lake Energy Company, L.L.C. Thoroughbred, L.L.C. Thoroughbred Generating Company, LLC Thoroughbred Mining Company, L.L.C. SCHEDULE II Affinity Mining Company Arclar Company, LLC Big Ridge, Inc. Black Beauty Coal Company Black Beauty Equipment Company Black Beauty Mining, Inc. Black Beauty Resources, Inc. Black Beauty Underground, Inc. Colony Bay Coal Company EACC Camps, Inc. Eagle Coal Company Eastern Associated Coal Corp. Empire Marine, LLC Falcon Coal Company GIBCO Motor Express, LLC Grand Eagle Mining, Inc. Hillside Mining Company Midco Supply and Equipment Corporation North Page Coal Corp. Ohio County Coal Company Peabody Holding Company, Inc. Sterling Smokeless Coal Company Sugar Camp Properties Yankeetown Dock Corporation