Filed by: Dorchester Minerals, L.P.
                           Pursuant to Rule 425 under the Securities Act of 1933
                                     and deemed filed pursuant to Rule 14a-12(b)
                                          of the Securities Exchange Act of 1934
                                                   Commission File No. 333-88282
                                      Subject Company: Dorchester Minerals, L.P.



     The following  draft of legal opinion of Thompson & Knight LLP was provided
to counsel for Energy Trust LLC, the  investment  manager for the Republic  ORRI
Owners,  on January 28, 2003 in connection with the proposed  reorganization  of
Republic  Royalty  Company and the  subsequent  combination  of the business and
properties of Republic, among others, into Dorchester Minerals, L.P.

                     [ERISA and Tax Opinion on Combination]
                                January 31, 2003



Republic Royalty Company, L.P.
3738 Oak Lawn Avenue, Suite 300
Dallas, Texas  75219

Energy Trust LLC
551 Fifth Avenue, 37th Floor
New York City, New York 10176-3799


     Re: Merger of Republic Royalty Company, L.P. into Dorchester Minerals, L.P.

Ladies and Gentlemen:

     We have acted as counsel to Republic Royalty Company, L.P., a Texas limited
partnership  ("Republic"),  in connection with the preparation and filing of the
proxy statement/prospectus  forming a part of the registration statement on Form
S-4 and the amendments and supplements thereto (collectively,  the "Registration
Statement"),  filed by Dorchester Minerals, L.P., a Delaware limited partnership
("DMLP"),  with the Securities and Exchange  Commission on October 30, 2002. The
Registration  Statement describes a transaction in which Republic will be merged
into DMLP (the  "Combination"),  with the Republic  limited  partners  receiving
common units of DMLP in exchange for their limited partnership interests.  Among
the limited  partners of Republic  receiving  common units in DMLP will be those
parties listed on Exhibit A attached hereto (the "Limited Partners").

     In our  capacity as counsel to Republic,  we have been  requested to render
certain  opinions  concerning  the  application  to the  Combination  of certain
provisions of the Internal  Revenue Code of 1986,  as amended (the "Code"),  and
the Employee  Retirement Income Security Act of 1974, as amended ("ERISA").  Our
opinions  are  based  on the  provisions  of the  Code  and  ERISA,  as  well as
regulations and other relevant  interpretive  authority,  in existence as of the
date of this opinion, any of which could be changed at any time, with or without
retroactive  effect.  Subsequent  amendments  or  changes  in the  Code,  ERISA,
regulations or other relevant  interpretive  authority (which may be retroactive
in application) may alter the opinions expressed herein. Based on the foregoing,
and on the  representations and statements of fact contained in the Registration
Statement and the  assumptions  made herein,  and subject to the limitations set
forth herein, it is our opinion that:

     1. As to those Limited Partners which are employee benefit plans subject to
ERISA and Section 4975 of the Code (the "Plans"),  the Combination will not be a
prohibited  transaction within the meaning of Sections 4975(c)(1)(A) through (D)
of the Code, or Section 406(a) of Title I of ERISA.

     2. Immediately  following the  Combination,  the assets of DMLP will not be
classified  as "plan assets" under the  Department of Labor  Regulation  Section
2510.3-101  (the "Plan  Asset  Regulation")  because  the  common  units in DMLP
received  by  the  Plans  as  a  result  of  the  Combination  will  qualify  as
"publicly-offered  securities"  as defined  in section  (b)(2) of the Plan Asset
Regulation.

     3. No unrelated  business  taxable income ("UBTI") under Section 511 of the
Code will be realized by the Plans as a result of the Combination.

     The foregoing  opinions are subject to and are qualified in all respects by
the following:

     (a) The  opinions  expressed  herein  are  limited in all  respects  to the
federal laws of the United States of America.

     (b) We have assumed that no person who is a "party in interest"  within the
meaning of Section 3(14) of ERISA or a "disqualified  person" within the meaning
of  Section  4975(e)(2)  of the Code with  respect to the Plans owns or will own
directly or indirectly as a result of the Combination 50% or more of the capital
or profits interests of either Republic or DMLP.

     (c) We have  assumed  that  Republic  and its  general  partners  have  not
heretofore  become  "fiduciaries"  under Section 3(21) of ERISA or under Section
4975(e)(3) of the Code with respect to the Plans.

     (d) We have assumed that Energy Trust LLC is a qualified professional asset
manager  with  respect  to each  Plan,  as  defined  in  Prohibited  Transaction
Exemption 84-14 adopted by the Department of Labor effective  December 31, 1982,
and is acting in such  capacity  on behalf  of the  Plans  with  respect  to the
Combination.

     (e) We have assumed that DMLP will have more than 100 partners  independent
of DMLP and of each other immediately after the Combination.

     (f) We are unable to express an opinion as to whether the Combination  will
constitute or result in non-exempt prohibited transactions within the meaning of
Section  4975(c) of the Code or Section  406 of ERISA  solely as a result of any
actions  taken by the  Plans or their  representatives  or any  other  person or
entity other than Republic or DMLP or their respective general partners.

     (g) We have assumed that the Plans are exempt from federal income  taxation
under Section 501(a) of the Code.

     (h) We have assumed that none of the Plans now owns or will  hereafter own,
directly  or  indirectly,  50% or more of the  capital or profits  interests  in
Republic or DMLP.

     (i) We have  assumed  that  Republic  has not and DMLP  will not  incur any
obligation  or liability to any person to pay the costs  incurred in  exploring,
developing  and  operating  any of the  mineral  or  royalty  interests  held by
Republic or DMLP or participate in the operations of any such properties.

     (j) We have assumed that the mineral and royalty interests held by Republic
have been and those held by DMLP will be treated as non-operating mineral rights
under the laws of any state having jurisdiction over such properties.

     (k) The opinions  expressed  herein are made as of the date hereof,  and we
assume no, and expressly  disclaim any,  obligation to update or supplement such
opinions to reflect any facts or  circumstances  which may hereafter come to our
attention  or any changes in laws which may  hereafter  occur which might affect
any matters or opinions set forth herein.

     (l) The  opinions  expressed  herein are  strictly  limited to the  matters
stated herein, and no other opinions may be implied.

     This opinion is being  provided at your request and is furnished to you for
your use in connection with the Combination. It may be relied upon by you and by
the Plans for that  limited  purpose,  and may not be relied upon or utilized by
any other party for any purpose.  No other use or  distribution  of this opinion
may be made without our prior written consent.


                                              Very truly yours,

                                              THOMPSON & KNIGHT L.L.P.



                                              By:
                                                 Thornton Hardie, III, Partner

TH/KQ
069041 000003 DALLAS 1541178.2

                                    EXHIBIT A

                                Limited Partners



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