CONFIRMING STATEMENT

      This Statement confirms that the undersigned, Thomas G. Casso, has
authorized and designated each of James A. Merrill and Pam Scott,
signing singly, to execute and file on the undersigned's behalf all
Forms 3, 4 and 5 (including any amendments thereto) that the undersigned
may be required to file with the U.S. Securities and Exchange Commission
as a result of the undersigned's ownership of or transactions in
securities of GMX Resources Inc.  The authority of James A. Merrill
and Pam Scott under this Statement shall continue until the undersigned
is no longer required to file Forms 3, 4, and 5 with regard to his
ownership of or transactions in securities of GMX Resources Inc.,
unless earlier revoked in writing.  The undersigned acknowledges that
James A. Merrill and Pam Scott are not assuming any of the
undersigned's responsibilities to comply with Section 16 of the
Securities Exchange Act of 1934.  This Statement revokes all prior
Statements pertaining to this subject matter.

      Dated:  April 7, 2010.

/s/ Thomas G. Casso
THOMAS G. CASSO