STOCKHOLDER VOTING AGREEMENT

Exhibit 99.1

STOCKHOLDER VOTING AGREEMENT

        THIS STOCKHOLDER VOTING AGREEMENT (this " Agreement ") is made, entered into, and effective as of January 25, 2005 by and among Cimarex Energy Co., a Delaware corporation (the " Cimarex "), and the persons listed on Schedule A ( Stockholders ) to this Agreement (each, a " Stockholder " and, collectively, the " Stockholders ").

RECITALS

        WHEREAS, concurrently with the execution and delivery of this Agreement, Cimarex, Cimarex Nevada Acquisition Co., a Nevada corporation and a wholly-owned subsidiary of Cimarex (" Merger Sub "), and Magnum Hunter Resources, Inc., a Nevada corporation (" Magnum "), are entering into an Agreement and Plan of Merger (the " Merger Agreement "), which provides, among other things, for the merger of Merger Sub with and into Magnum (the " Merger "), all on the terms and subject to the conditions set forth in the Merger Agreement; and

        WHEREAS, as an inducement and a condition to entering into the Merger Agreement, Cimarex has required that each Stockholder agree, and each Stockholder has agreed, to enter into this Agreement;

AGREEMENT

        NOW, THEREFORE, in and as consideration of and for the foregoing premises and the representations, warranties, agreements, and covenants contained in this Agreement, 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:

        1.      Definitions . Any and all capitalized terms used in this Agreement and not otherwise defined in this Agreement shall have the meaning(s) assigned to such term(s) in the Merger Agreement which is incorporated herein by reference.

        2.      Voting . Unless and until this Agreement is terminated:

•         (a)   Each Stockholder shall, at each meeting of the stockholders of Magnum, if any, however called, or in connection with each written consent of the stockholders of Magnum, if any, vote (or cause to be voted) all shares of Company Common Stock then held of record and/or beneficially owned by such Stockholder (the " Shares ") (to the extent such Stockholder has the right to vote or direct the voting of such Shares), (i) in favor of the Merger, the execution and delivery by Magnum of the Merger Agreement and the approval of the terms thereof and each of the other actions contemplated by the Merger Agreement and this Agreement and any actions required in furtherance thereof and hereof and (ii) against any proposal relating to a Superior Proposal and against any action or agreement that would impede, frustrate, prevent, or nullify this Agreement, or result in a breach in any respect of any covenant, representation, or warranty or any other obligation or agreement of Magnum under the Merger Agreement or which would result in any of the conditions set forth in Article VI of the Merger Agreement not being fulfilled.

•         (b)   Each Stockholder hereby covenants and agrees that, except as contemplated by this Agreement and/or the Merger Agreement, such Stockholder shall not (i) offer to transfer (which term shall include, without limitation, any sale, tender, gift, pledge, assignment or other disposition), transfer, or consent to any transfer of, any of the Shares beneficially owned by such Stockholder (to the extent such Stockholder has the right to dispose of or direct the disposition of such Shares) or any interest therein without the prior written consent of Cimarex, such consent not to be unreasonably withheld, conditioned, or delayed in the case of a gift or similar estate planning transaction (it being understood that Cimarex may decline to consent to any such transfer if the person acquiring such Shares does not agree to take such Shares subject to the terms of this Agreement), (ii) enter into any contract, option, or other agreement or understanding with respect to any transfer of any such Shares or any interest therein, (iii) grant any proxy, power-of-attorney, or other authorization or consent in or with respect to any such Shares (other than pursuant to and in accordance with this Agreement), (iv) deposit any such Shares into a voting trust or enter into a voting agreement or arrangement with respect to any such Shares (other than pursuant to and in accordance with this Agreement), or (v) take any other action that would make any representation or warranty of such Stockholder contained herein untrue or incorrect in any material respect or in any way restrict, limit, or interfere in any material respect with the performance of the obligations of such Stockholder hereunder or the transactions contemplated hereby or by the Merger Agreement.

          (c)   Subject to the terms and conditions of this Agreement, each of the parties hereto agrees to use all commercially reasonable efforts to take, or cause to be taken, all actions, and to do, or cause to be done, all things necessary, proper, and/or advisable under applicable laws to consummate and make effective the transactions contemplated by this Agreement. Each party hereto shall promptly consult with the other parties hereto and provide any necessary information and material with respect to all filings made by any party hereto with any Governmental Authority in connection with this Agreement and the transactions contemplated hereby.

          (d)   Each Stockholder hereby waives any rights of appraisal or rights to dissent from the Merger that such Stockholder may have.

        3.      Representations and Warranties of Each Stockholder . Each Stockholder hereby represents and warrants, severally and not jointly, to Cimarex as follows:

•         (a)    Ownership of Shares . Such Stockholder is the "beneficial owner" (as defined in Rule 13d-3 under the Securities Exchange Act of 1934, as amended, which meaning shall apply for all purposes of this Agreement) of, and has the sole power to vote and dispose of, the number of Shares set forth opposite the name of such Stockholder on Schedule A ( Stockholders ) hereto and is the beneficial owner of options and/or warrants (collectively, the " Options ") to purchase the number of shares of Company Common Stock set forth opposite the name of such Stockholder on Schedule A ( Stockholders ) hereto, in each case, free and clear of any security interests, liens, charges, encumbrances, equities, claims, options or limitations of whatever nature and free of any other limitation or restriction (including, without limitation, any restriction on the right to vote, sell, or otherwise dispose of such Shares or Options), except, in each case, as may exist by reason of this Agreement or pursuant to applicable law or, in the case of the Options, the restrictions on transferability and/or on exercise or purchase provided for in the applicable option or warrant agreement and/or any related plan, as applicable. The number of Shares and Options set forth opposite the name of such Stockholder on Schedule A ( Stockholders ) hereto represents all of the shares of capital stock of Magnum beneficially owned by such Stockholder as of the date of this Agreement.

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•         (b)   Such Stockholder has the power and authority to enter into and perform all of such Stockholder's obligations under this Agreement. This Agreement has been duly and validly executed and delivered by such Stockholder and, assuming due execution and delivery by, and enforceability against, Cimarex, constitutes a legal, valid and binding agreement of such Stockholder, enforceable against such Stockholder in accordance with its terms, except as such enforcement may be limited by any equitable defense. There is no beneficiary or holder of a voting trust certificate or other interest of any trust of which such Stockholder is a trustee, or any party to any o