Exhibit 99.1

   CIMAREX ENERGY CO. ANNOUNCES THE AMENDMENT OF ITS CASH OFFER TO ACQUIRE THE
      CONVERTIBLE NOTES ASSUMED IN THE MAGNUM HUNTER RESOURCES, INC. MERGER

     DENVER, July 27 /PRNewswire-FirstCall/ -- Cimarex Energy Co. (NYSE: XEC)
(Cimarex) today announced the amendment of its offer to purchase for cash any
and all of its outstanding Floating Rate Convertible Senior Notes due 2023 (the
Convertible Notes) originally issued by Magnum Hunter Resources, Inc. (MHR). The
offer is being made to satisfy Cimarex's contractual obligations under the
indenture governing the Convertible Notes to offer to repurchase the Convertible
Notes in connection with its merger with MHR.

     The amendment is being made to clarify the withdrawal rights of holders of
the Convertible Notes and certain disclosure obligations of Cimarex, to amend
the condition to the offer, and to eliminate the right of Cimarex to terminate
the offer. The only condition to the offer as amended is that no event of
default under the indenture governing the Convertible Notes (other than the
failure to pay the purchase price for the Convertible Notes in the offer) exists
at the time the offer expires.

     The expiration time of the offer has not changed. The offer is scheduled to
expire at 5:00 p.m., New York City time, on August 5, 2005, unless extended.

     Deutsche Bank Trust Company Americas is the depositary and the information
agent for the offer. Requests for assistance or documentation should be directed
to the information agent at c/o DB Services Tennessee, Inc., 648 Grassmere Park
Road, Nashville, TN 37211, Attn: Reorganization Unit, telephone (800) 735-7777.
Beneficial owners of notes may also contact their brokers, dealers, commercial
banks, trust companies or other nominee through which they hold their notes with
questions and requests for assistance.

     This press release is neither an offer to purchase nor a solicitation of an
offer to sell securities. The offer is being made solely by the Change in
Control Notice and Offer to Purchase for the Convertible Notes, as amended and
supplemented, and the related Letter of Transmittal. A Supplement to the Change
in Control Notice and Offer to Purchase and a revised Letter of Transmittal are
being mailed to noteholders today. Holders should use the revised Letter of
Transmittal to tender their Convertible Notes. Additional copies of these
documents and the other offer materials may be obtained by contacting the
information agent.

     About Cimarex Energy
     Denver-based Cimarex Energy Co. is an independent oil and gas exploration
and production company with principal operations in the Mid-Continent, Gulf
Coast, Permian Basin of West Texas and New Mexico and Gulf of Mexico areas of
the U.S.



     Important Additional Information Concerning The Convertible Notes Offer
Will Be Filed With The SEC.

     Cimarex plans to file today with the SEC an amendment to its Schedule TO in
connection with the offer. The Schedule TO, as amended, including the related
Change in Control Notice and Offer to Purchase for the Convertible Notes, as
amended and supplemented, and the revised Letter of Transmittal, contain
important information about Cimarex, the Convertible Notes, the offer and
related matters. Investors and security holders are urged to read the amendment
to the Schedule TO carefully when it becomes available.

     Investors and security holders may obtain free copies of the Schedule TO,
any amendments or supplements to the Schedule TO, and other documents filed with
the SEC by Cimarex through the web site maintained by the SEC at www.sec.gov. In
addition, investors and security holders may obtain free copies of the Schedule
TO from Cimarex by written or oral request, Attn: Corporate Secretary, 1700
Lincoln Street, Suite 1800, Denver, Colorado 80203-4518, telephone
(303) 295-3995.

SOURCE  CIMAREX ENERGY CO.
     -0-                             07/27/2005
     /CONTACT: Mark Burford, Director of Capital Markets of Cimarex Energy Co.,
+1-303-295-3995/