POWER OF ATTORNEY

STATE OF TEXAS	     )(

				 	KNOW ALL MEN BY THESE PRESENTS:

COUNTY OF DALLAS  )(

THAT I, Antoine M. Doumet, a Director of United States
Lime & Minerals,Inc.,a Texas corporation, hereby constitute and
appoint Timothy W. Byrne and M. Michael Owens as my true and
lawful attorneys-in-fact and agents, with full power of
substitution and resubstitution, to sign for me and in my name,
place, and stead, in any and all capacities, any and all forms
required to be filed by me pursuant to Section 16(a) of the
Securities Exchange Act of 1934 and the rules promulgated
thereunder and any and all amendments to such forms and to file
the same with the United States Securities and Exchange Commission.
I further hereby ratify and confirm any and all actions, matters,
and things that such attorneys-in-fact and agents shall lawfully
do or cause to be done by virtue of this Power of Attorney and
the rights and powers granted herein. This Power of Attorney
expires on May 31, 2011.


	EXECUTED this 30th day of April, 2010
						       / s / Antoine M. Doumet

STATE OF TEXAS          )(
COUNTY OF DALLAS   )(

	This instrument was acknowledged before me on the 30th day of
April, 2010 by Antoine M. Doumet.

						/ s / Nita Webb
						Notary Public
						State of Texas

						My Commission Expires:
						10/12/12