Exhibit 23.3
CONSENT OF INDEPENDENT PETROLEUM ENGINEERS
May 18, 2011
We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 of Cimarex Energy Co. (Cimarex), the Exhibits to that Registration Statement and the related Prospectus of the reference to DeGolyer and MacNaughton in the Annual Report on Form 10-K of Cimarex Energy Co. for the fiscal year ended December 31, 2010 of Cimarex and its subsidiaries, filed with the U.S. Securities and Exchange Commission.
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| Very truly yours, |
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| DeGOLYER and MacNAUGHTON |
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| Texas Registered Engineering Firm F-716 |