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 Michael L. Wiedemer  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.

	EXECUTED this 2nd  day of March, 2018

					/s/ Antoine M. Doumet

STATE OF TEXAS          )(
COUNTY OF DALLAS   )(

	This instrument was acknowledged before me on the 2nd day of
March, 2018 by Antoine M. Doumet.

						/s/ Nita Mitchell
						Notary Public
						State of Texas

						My Commission Expires:
						10/12/2019