Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 ----------------- STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) ------------ ----------------- THE BANK OF NEW YORK (Exact name of trustee as specified in its charter) New York 13-5160382 (Jurisdiction of incorporation (I.R.S. Employer if not a U.S. national bank) Identification No.) One Wall Street, New York, New York 10286 (Address of principal executive offices) (Zip code) ----------------- ARCH WESTERN FINANCE, LLC* (Exact name of obligor as specified in its charter) Delaware 43-1811130 (State or other jurisdiction (I.R.S. Employer of incorporation or organization) Identification No.) One CityPlace Drive, Suite 300 St. Louis, Missouri 63141 (Address of principal executive offices) (Zip code) *See Additional Registrants below. ARCH WESTERN RESOURCES, LLC (Exact name of obligor as specified in its charter) Delaware 43-1811130 (State or other jurisdiction (I.R.S. Employer of incorporation or organization) Identification No.) One CityPlace Drive, Suite 300 St. Louis, Missouri 63141 (Address of principal executive offices) (Zip code) ARCH OF WYOMING, LLC (Exact name of obligor as specified in its charter) Delaware 43-1811130 (State or other jurisdiction (I.R.S. Employer of incorporation or organization) Identification No.) One CityPlace Drive, Suite 300 St. Louis, Missouri 63141 (Address of principal executive offices) (Zip code) MOUNTAIN COAL COMPANY, L.L.C. (Exact name of obligor as specified in its charter) Delaware 43-1811130 (State or other jurisdiction (I.R.S. Employer of incorporation or organization) Identification No.) One CityPlace Drive, Suite 300 St. Louis, Missouri 63141 (Address of principal executive offices) (Zip code) THUNDER BASIN COAL COMPANY, L.L.C. (Exact name of obligor as specified in its charter) Delaware 43-1811130 (State or other jurisdiction (I.R.S. Employer of incorporation or organization) Identification No.) One CityPlace Drive, Suite 300 St. Louis, Missouri 63141 (Address of principal executive offices) (Zip code) ----------------- 6-3/4% SENIOR NOTES DUE 2013 (Title of the Indenture securities) ITEM 1. GENERAL INFORMATION. Furnish the following information as to the Trustee: (a) Name and address of each examining or supervising authority to which it is subject. Superintendent of Banks of the 2 Rector Street, New York, N.Y. 10006 State of New York and Albany, N.Y. 12203 Federal Reserve Bank of New York 33 Liberty Plaza, New York, N.Y. 10045 Federal Deposit Insurance Corporation 550 17th Street, N.W., Washington, D.C. 20429 New York Clearing House Association New York, N.Y. 10005 (b) Whether it is authorized to exercise corporate trust powers. Yes. ITEM 2. AFFILIATIONS WITH OBLIGOR. If the obligor is an affiliate of the trustee, describe each such affiliation. None. (See Note on page 2.) ITEM 16. LIST OF EXHIBITS. Exhibits identified in parentheses below, on file with the Commission, are incorporated herein by reference as an exhibit hereto, pursuant to Rule 7a-29 under the Trust Indenture Act of 1939 (the "Act") and 17 C.F.R. 229.10(d). 1. - A copy of the Organization Certificate of The Bank of New York (formerly Irving Trust Company) as now in effect, which contains the authority to commence business and a grant of powers to exercise corporate trust powers. (Exhibit 1 to Amendment No. 1 to Form T-1 filed with Registration Statement No. 33-6215, Exhibits 1a and 1b to Form T-1 filed with Registration Statement No. 33-21672 and Exhibit 1 to Form T-1 filed with Registration Statement No. 33-29637.) 4. - A copy of the existing By-laws of the Trustee. (Exhibit 4 to Form T-1 filed as Exhibit 25(a) to Registration Statement No. 333-102200.) 6. - The consent of the Trustee required by Section 321(b) of the Act. (Exhibit 6 to Form T-1 filed with Registration Statement No. 33-44051.) 7. - A copy of the latest report of condition of the Trustee published pursuant to law or to the requirements of its supervising or examining authority. NOTE Inasmuch as this Form T-1 is being filed prior to the ascertainment by the Trustee of all facts on which to base a responsive answer to Item 2, the answer to said Item is based on incomplete information. Item 2 may, however, be considered as correct unless amended by an amendment to this Form T-1. SIGNATURE Pursuant to the requirements of the Act, the Trustee, The Bank of New York, a corporation organized and existing under the laws of the State of New York, has duly caused this statement of eligibility to be signed on its behalf by the undersigned, thereunto duly authorized, all in The City of New York, and State of New York, on the 29th day of July 2003. THE BANK OF NEW YORK By: /s/ ROBERT A. MASSIMILLO ------------------------------ Name: Robert A. Massimillo Title: Vice President - 2 - EXHIBIT 7 (Page 1 of 3) Consolidated Report of Condition of THE BANK OF NEW YORK of One Wall Street, New York, N.Y. 10286 And Foreign and Domestic Subsidiaries, a member of the Federal Reserve System, at the close of business March 31, 2003, published in accordance with a call made by the Federal Reserve Bank of this District pursuant to the provisions of the Federal Reserve Act. Dollar Amounts In Thousands ASSETS Cash and balances due from depository institutions: Noninterest-bearing balances and currency and coin.. $4,389,492 Interest-bearing balances........................... 3,288,212 Securities: Held-to-maturity securities......................... 654,763 Available-for-sale securities....................... 17,626,360 Federal funds sold in domestic offices................. 1,759,600 Securities purchased under agreements to resell.............................................. 911,600 Loans and lease financing receivables: Loans and leases held for sale................ 724,074 Loans and leases, net of unearned income...............32,368,718 LESS: Allowance for loan and lease losses............826,505 Loans and leases, net of unearned income and allowance.............................. 31,542,213 Trading Assets......................................... 7,527,662 Premises and fixed assets (including capitalized leases)............................................. 825,706 Other real estate owned................................ 164 Investments in unconsolidated subsidiaries and associated companies................................ 260,940 Customers' liability to this bank on acceptances outstanding......................................... 225,935 Intangible assets...................................... Goodwill............................................ 2,027,675 Other intangible assets............................. 75,330 Other assets........................................... 4,843,295 --------- Total assets........................................... $76,683,021 =========== 5 EXHIBIT 7 (Page 2 of 3) LIABILITIES Deposits: In domestic offices................................. $33,212,852 Noninterest-bearing.......................12,997,086 Interest-bearing..........................20,215,766 In foreign offices, Edge and Agreement subsidiaries, and IBFs............................ 24,210,507 Noninterest-bearing..........................595,520 Interest-bearing..........................23,614,987 Federal funds purchased in domestic offices........................................... 375,322 Securities sold under agreements to repurchase......... 246,755 Trading liabilities.................................... 2,335,466 Other borrowed money: (includes mortgage indebtedness and obligations under capitalized leases)....... 959,997 Bank's liability on acceptances executed and outstanding......................................... 227,253 Subordinated notes and debentures...................... 2,090,000 Other liabilities...................................... 5,716,796 ----------- Total liabilities...................................... $69,374,948 =========== Minority interest in consolidated subsidiaries...................................... 540,772 EQUITY CAPITAL Perpetual preferred stock and related surplus........................................... 0 Common stock........................................... 1,135,284 Surplus................................................ 1,056,295 Retained earnings...................................... 4,463,720 Accumulated other comprehensive income......... 112,002 Other equity capital components..................... 0 Total equity capital................................... 6,767,301 --------- Total liabilities minority interest and equity capital. $76,683,021 =========== 6 EXHIBIT 7 (Page 3 of 3) I, Thomas J. Mastro, Senior Vice President and Comptroller of the above-named bank do hereby declare that this Report of Condition has been prepared in conformance with the instructions issued by the Board of Governors of the Federal Reserve System and is true to the best of my knowledge and belief. Thomas J. Mastro, Senior Vice President and Comptroller We, the undersigned directors, attest to the correctness of this Report of Condition and declare that it has been examined by us and to the best of our knowledge and belief has been prepared in conformance with the instructions issued by the Board of Governors of the Federal Reserve System and is true and correct. Thomas A. Renyi --- Directors Gerald L. Hassell | Alan R. Griffith | | --- 7