Exhibit 23.3
CAWLEY, GILLESPIE & ASSOCIATES, INC.
| PETROLEUM CONSULTANTS |
|
|
|
|
9601 AMBERGLEN BLVD., SUITE 117 | 306 WEST SEVENTH STREET, SUITE 302 | 1000 LOUISIANA STREET, SUITE 625 |
AUSTIN, TEXAS 78729-1106 | FORT WORTH, TEXAS 76102-4987 | HOUSTON, TEXAS 77002-5008 |
512-249-7000 | 817- 336-2461 | 713-651-9944 |
| www.cgaus.com |
|
CONSENT OF INDEPENDENT PETROLEUM ENGINEERS
Board of Directors
Three Rivers Operating Company Inc.
Austin, Texas
We hereby consent to the references to Cawley, Gillespie & Associates, to the inclusion of our estimates of reserves contained in our reports entitled “Evaluation, Three Rivers Operating Company, LLC Interests, Proved Reserves, As of January 1, 2011” and “Evaluation, Three Rivers Operating Company, LLC Interests, Proved Reserves, As of September 30, 2011” and to the specific references to Cawley, Gillespie & Associates as the independent petroleum engineering firm in this Form S-1 Registration Statement and any amendments thereto (collectively, the “Registration Statement”) and the prospectus to which the Registration Statement is related. We further consent to the inclusion of our letter reports dated March 14, 2011 and January 10, 2012 as exhibits to the Registration Statement.
Yours truly, |
|
CAWLEY, GILLESPIE & ASSOCIATES |
|
Fort Worth, Texas |
January 24, 2012 |
