EXHIBIT 23.3
CAWLEY, GILLESPIE & ASSOCIATES, INC.
PETROLEUM CONSULANTS
9601 AMBERGLEN BLVD., |
| 306 WEST SEVENTH STREET, |
| 1000 LOUISIANA STREET, |
AUSTIN, TEXAS 78729-1106 |
| FORT WORTH, TEXAS 76102-4987 |
| HOUSTON, TEXAS 77002-5008 |
512-249-7000 |
| 817-336-2461 |
| 713-651-9944 |
FAX 512-233-2618 |
| FAX 817-877-3728 |
| FAX 713-651-9980 |
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| www.cgaus.com |
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CONSENT OF CAWLEY, GILLESPIE & ASSOCIATES, INC.
We hereby consent to the inclusion in this Report on Form S-1 prepared by Carbon Natural Gas Company (the “Company”) for the year ending December 31, 2010, of our audit report relating to certain estimated quantities, as prepared by the Company, of the proved developed producing reserves of oil and gas of Nytis Exploration Company, LLC, effective December 31, 2010. We further consent to references to our firm under the heading “Description of Business-Independent Reserve Audit” in the Form S-1.
Very truly yours,
/s/J. Zane Meekins |
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J. Zane Meekins, P.E. |
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Senior Vice President |
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Cawley, Gillespie & Associates, Inc. |
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Texas Registered Engineering Firm No. F-693 |
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August 11, 2011