EXHIBIT 23.3
DEGOLYER AND MACNAUGHTON
5001 SPRING VALLEY ROAD
SUITE 800 EAST
DALLAS. TEXAS 75244
September 14, 2012
Cimarex Energy Company
1700 Lincoln Street
Suite 1800
Denver, Colorado 80203-4518
Ladies and Gentlemen:
We hereby consent to the reference to DeGolyer and MacNaughton, to references to our review of proved oil and gas reserves for the years ended December 31, 2011, 2010, and 2009, of Cimarex Energy Company (Cimarex) presented in our letter reports dated January 20,2012, January 19, 2011, and January 29,2010. We further consent to the incorporation of information contained in our letter reports under the heading “Experts” in the Registration Statement on Form S-3 of Cimarex to be filed during September 2012.
| Very truly yours, |
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| /s/ DeGolyer and MacNaughton |
| DeGOLYER and MacNAUGHTON |
| Texas Registered Engineering Firm F-716 |
