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  is a proposed  amendment  letter  delivered  by the general
partners of Republic  Royalty Company to the Republic ORRI owners on January 22,
2003  relating to proposed  amendments  to certain  combination  documents.  The
proposed amendment letter is not final and is subject to further discussons with
the Republic ORRI Owners.


                                January ___, 2003


To the Republic ORRI Owners and the
Limited Partners of Dorchester Hugoton, Ltd.
and Spinnaker Royalty Company, L.P.

     In connection with the proposed  combination of the business and properties
of Dorchester  Hugoton,  Ltd.  ("DHL"),  Republic Royalty Company  ("RRC"),  and
Spinnaker  Royalty  Company,  L.P. ("SRC") into Dorchester  Minerals,  L.P. (the
"Partnership")  pursuant to that certain Combination  Agreement,  dated December
13, 2001,  as amended (the  "Combination  Agreement"),  among DHL, RRC, SRC, the
Partnership,   Dorchester   Minerals  Management  LP  (the  "General  Partner"),
Dorchester  Minerals  Management  GP LLC (the  "Management  GP") and  Dorchester
Minerals Operating LP, and the Contribution  Agreement,  dated December 13, 2001
(the  "Contribution  Agreement"),  the undersigned hereby agree to the following
matters.  Capitalized terms used herein but not otherwise defined shall have the
meanings attributed to them in the applicable document in which context they are
used.

Amended and Restated Partnership Agreement

     The  Combination  Agreement  is  amended to provide  that the  Amended  and
Restated Agreement of Limited Partnership of the Partnership,  the form of which
is  attached  as Exhibit  1.2 to the  Combination  Agreement  (the  "Partnership
Agreement"), is amended to provide for the following:

     The General  Partner  shall be under a  fiduciary  duty and  obligation  to
     conduct  the  affairs of the  Partnership  in a manner  that it  reasonably
     believes to be in, or not  inconsistent  with,  the best  interests  of the
     Partnership and the Limited Partners.  The foregoing  statement is intended
     to modify  Section  7.9(b) of the  Partnership  Agreement as to the General
     Partner and its Affiliates other than the members of the Advisory Committee
     and non-manager officers of Affiliates of the General Partner.

     Notwithstanding any provision to the contrary in the Partnership  Agreement
     (including  Sections  7.5, 7.6 and 7.9),  whenever a potential  conflict of
     interest  exists  or  arises  between  the  General  Partner  or any of its
     Affiliates, on the one hand, and the Partnership or any of its Partners, on
     the other,  the General  Partner in connection  with its resolution of such
     conflict is required to seek Special Approval of such resolution.  Further,
     the General Partner shall not be entitled to use its "sole  discretion" (as
     defined in the  Partnership  Agreement) in determining  whether a potential
     conflict of interest exists.

     Notwithstanding any provision to the contrary in the Partnership  Agreement
     (including Section  7.1(a)(i)),  to the extent necessary to avoid unrelated
     business  taxable income,  the General Partner is prohibited from incurring
     indebtedness,  excluding  trade  payables,  (i) in excess of $50,000 in the
     aggregate  at any given time or (ii) which  would  constitute

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     "acquisition  indebtedness"  (as  defined  in Section  514 of the  Internal
     Revenue Code of 1986, as amended).

     Notwithstanding any provision to the contrary in the Partnership  Agreement
     (including  Section  7.1(a)(xiii)),   to  the  extent  necessary  to  avoid
     unrelated  business taxable income, the General Partner shall not cause the
     Partnership to acquire working  interests or cost bearing  interests in any
     oil and gas leases or similar  assets.  In the event that any of the assets
     of the Partnership become working interests or cost bearing interests,  the
     General  Partner  shall cause such  assets to be assigned to the  Operating
     Subsidiary in accordance with the Royalty/NPI Agreement.

     The definition of "Available  Cash" is amended to (i) delete the phrase "in
     the  reasonable  discretion  of the General  Partner" and (ii) provide that
     cash reserves for acquisitions may only be excluded from the calculation of
     Available Cash to the extent such acquisitions are the subject of a binding
     agreement or a non-binding  letter of intent.  Further,  Section  7.9(b) is
     amended to delete the next to last sentence.

     Notwithstanding any provision to the contrary in the Partnership  Agreement
     (including  Sections  5.7 and  7.3(c)),  in the event that the  Partnership
     acquires  properties for a combination of cash and  Partnership  Interests,
     (i) the cash component of the acquisition  consideration  shall be equal to
     or less than 5% of the aggregate cash distributions made by the Partnership
     for the four  most  recent  Quarters  and (ii) the  amount  of  Partnership
     Interests to be issued in such  acquisition,  after  giving  effect to such
     issuance,  shall not  exceed  10% of the  outstanding  Limited  Partnership
     Interests.

     Notwithstanding any provision to the contrary in the Partnership  Agreement
     (including Section 5.6(a)),  the Partnership is prohibited from issuing any
     Partnership  Securities  having  greater  rights or powers  than the common
     units  of  the  Partnership,   and  any  options,   rights,  warrants,  and
     appreciation  rights relating to such Partnership  Securities,  unless such
     issuance is approved by a Unit Majority.

     Notwithstanding anything to the contrary in Article XIII of the Partnership
     Agreement, the Partnership shall, beginning in 2004, hold an annual meeting
     of limited  partners  of the  Partnership.  In  connection  with the annual
     meeting,  (i) the members of the  Advisory  Committee  will be elected by a
     plurality of the votes of the  Outstanding  Limited  Partnership  Interests
     present at the  meeting in person or by proxy and  entitled  to vote in the
     election and (ii) such other  business  will be  transacted  as is properly
     brought  before the meeting.  Members of  Management GP who in the original
     form of Limited  Liability  Company Agreement of Management GP, attached as
     Exhibit A to the  Contribution  Agreement (the  "Management GP Agreement"),
     had the  right to  appoint  persons  to serve as  members  of the  Advisory
     Committee  (i) shall have the right to appoint  persons to serve as members
     of the Advisory  Committee until the  Partnership's  2004 annual meeting of
     limited partners and (ii) beginning with the 2004 annual meeting of limited
     partners,  shall have the right to cause the  General  Partner to  nominate
     persons for  election as members of the Advisory  Committee  in  accordance
     with the  Management  GP  Agreement.  In  addition,  limited  partners  may
     nominate  additional  persons  for  election  as a member  of the  Advisory
     Committee  in  accordance  with the  procedures  as set forth in

<page>

     Exhibit A attached hereto. The Partnership  Agreement is amended to include
     the provisions contained in Exhibit A.

     The  definition  of  "Outstanding"  is  amended  to mean  "with  respect to
     Partnership  Securities,  all Partnership Securities that are issued by the
     Partnership  and reflected as  outstanding on the  Partnership's  books and
     records as of the date of determination."

     Notwithstanding  anything to the contrary in newly renumbered Section 13.5,
     special  meetings  of the  Limited  Partners  may be called by the  General
     Partner  or by  Limited  Partners  owning  20% or more  of the  Outstanding
     Limited  Partner  Interests  of the class or classes for which a meeting is
     proposed, provided that the Limited Partners shall only be entitled to call
     one special meeting every 12 months. Section 13.5, as newly renumbered,  is
     amended to include the provisions contained in Exhibit A.

     Section  7.12(b)  is amended to  provide  that the  General  Partner or its
     Affiliates  have the right to "piggyback" on a registration  requested by a
     holder,  other  than the  General  Partner  and its  Affiliates,  of demand
     registration  rights,   provided  that  the  party  exercising  the  demand
     registration  may,  at any time,  abandon  or delay  any such  registration
     initiated by it. If the proposed offering upon which the General Partner or
     its Affiliates  exercise their  piggyback  rights shall be an  underwritten
     offering,  then,  in the event that the  managing  underwriter  or managing
     underwriters  of such  offering  advise  the  Partnership  and the  General
     Partner or its Affiliates  electing to exercise piggyback rights in writing
     that  in  their  opinion  the  inclusion  of all of  the  securities  would
     adversely and materially affect the success of the offering, the securities
     that  shall be  included  in such  offering  shall be  allocated  among the
     parties  exercising demand  registration  rights and the General Partner or
     its Affiliates  exercising  piggyback  registration rights in proportion to
     the  total  number  of  securities  that  the  parties   exercising  demand
     registration  rights propose to register in relation to the total number of
     securities that the General Partner or its Affiliates  exercising piggyback
     registration rights propose to register.

Transfer Restriction Agreement

     The  Contribution  Agreement  is amended to provide  that Article IV of the
Transfer  Restriction  Agreement,  the form of which is attached as Exhibit C to
the Contribution  Agreement, is amended to provide that permitted sales to third
parties,  subject to a right of first refusal, may not be made prior to December
31, 2010.

Lock-Up Agreement of William Casey McManemin

     The Combination  Agreement is amended to provide that as a condition to the
obligation  of the  parties  to the  Combination  Agreement  to  consummate  the
combination,  the  Partnership  and William  Casey  McManemin  will enter into a
lock-up agreement that prohibits the Disposition of any of the Securities, owned
at the time of execution of the lock-up  agreement by Mr. McManemin  directly or
with  respect  to  which  Mr.  McManemin  has  an  economic  interest  ("Covered
Securities") until the second anniversary of the closing of the combination. The
lock-up  agreement  shall expire as to 25% of the initial  amount of the Covered
Securities  upon each of the  second,  third  and  fourth  anniversaries  of the
closing of the  combination,  such that following

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the fourth  anniversary  of  theclosing  of the  combination,  Mr.  McManemin is
permitted  to sell up to 75% of the initial  amount of the  Covered  Securities,
which restriction shall continue until such time as Mr. McManemin ceases to be a
manager  of  Management  GP.  In no event  shall  the  lock-up  agreement  cover
securities which Mr. McManemin  beneficially  owns, or is deemed to beneficially
own, but in which he does not have an economic interest. Limited partnerships in
existence on the date of the lock-up agreement and in which Mr. McManemin has an
economic  interest  solely as a limited  partner  shall not be  prohibited  from
making a Disposition with respect to any or all of the Covered  Securities owned
by the limited partnership. A partnership or entity of which Mr. McManemin is an
officer  or  general  partner  shall not be  prohibited  from  making an in-kind
distribution  of Covered  Securities  to its owners,  provided  that any Covered
Securities distributed to Mr. McManemin, or a partnership or entity of which Mr.
McManemin is a general partner or officer,  will be subject to the provisions of
the lock-up  agreement.  The prohibition on a Disposition of Covered  Securities
will  be  subject  to  exceptions   for  (i)  bona  fide  gifts  and  charitable
contributions of up to a total of 50,000 common units during the first two years
of the  lock-up  agreement  and (ii)  transfers  to members  of Mr.  McManemin's
immediate  family,  or a trust or trusts for the  benefit of any of such  family
members,  provided  that such  family  member or trust  agrees in  writing to be
subject to the provisions of the lock-up agreement.

Operating Subsidiary Limited Partnership Agreement

     The Agreement of Limited  Partnership  of the Operating  Subsidiary,  dated
December 12, 2001, is amended to provide that the Operating  Subsidiary  may not
sell or  transfer  any  working  interests  owned by it and which  underlie  the
overriding  royalty  interests in such properties  held by the Partnership  (the
"Operating  ORRIs"),  unless the related Operating ORRIs are sold or transferred
simultaneously at corresponding prices.

Amended and Restated LLC Agreement of Management GP

     The  Contribution  Agreement  is amended to provide that Section 8.2 of the
Management GP Agreement is amended to provide that the Appointment  Rights shall
consist of (i) the right to appoint  persons to serve as members of the Advisory
Committee until the  Partnership's  2004 annual meeting of limited  partners and
(ii) beginning with the 2004 annual  meeting of limited  partners,  the right to
cause the  General  Partner to nominate  persons for  election as members of the
Advisory  Committee in accordance with the Management GP Agreement and that such
nominees  will  be  elected  by  the  limited  partners  of the  Partnership  in
accordance with the Partnership Agreement of the Partnership.

Business Opportunities Agreement

     Section 3 of the Business Opportunities Agreement, dated December 13, 2001,
is amended to provide  that (i) "Oil and Gas  Interests"  shall mean oil and gas
interests,  including but not limited to, (a) oil and gas net profits interests,
(b) royalty  interests  and other  mineral  interests and (c) to the extent such
interests  are within the  geographic  boundaries of any lease,  tract,  unit or
parcel of land then owned by the Partnership or in which the Partnership at that
time has an interest,  working interests or other cost bearing  interests;  (ii)
the threshold  purchase price of a Qualifying  Acquisition  Opportunity shall be
greater than three percent (3%) of the Market Capitalization of the Partnership;
(iii)  beginning on January 1, 2004, a Manager of  Management

<page>

GP that is also an Affiliate or employee of (a) the GP Parties or any Subsidiary
thereof or (b) any Officer or any  Subsidiary  thereof  shall also be subject to
the obligations  provided in Section 3 and such obligations on such Manager will
apply to all  opportunities  without  regard to the amount of the purchase price
and (iv) that the Notifying Party must provide written notice to the Partnership
at least 21 days prior to the consummation of the  transactions  contemplated by
the Purchase Agreement.

Indemnity Agreement

     The Combination  Agreement is amended to delete Section 11.18,  which would
have required that the Partnership and an affiliate of Republic Royalty Company,
LP enter into an indemnity agreement in connection with certain litigation.

Registration Rights Agreement

     The proposed  Registration  Rights  Agreement among the Partnership and the
Republic ORRI owners (the "Registration Rights Agreement") is amended to provide
for the following (the specific  provisions of the Registration Rights Agreement
being amended are shown in parentheses below):

     "Best Efforts" is defined as "a Person's  reasonable  best efforts  without
     the incurrence of unreasonable expense" (Section 1).

     The  Partnership  will bear all  expenses  arising from a  registration  of
     securities  pursuant  to the  Registration  Rights  Agreement,  other  than
     underwriting discounts and commissions (Section 4).

     The  holders of  Registrable  Securities  are  entitled  to four demand and
     unlimited piggyback  registrations,  provided that not more than two demand
     registrations may be Form S-3 shelf registrations (Section 2).

     The holders of Registrable  Securities are entitled to "piggyback" (i) on a
     registration by the Partnership for an offering of equity securities of the
     Partnership for cash (other than an offering relating solely to an employee
     benefit plan) and (ii) on a registration  requested by the General  Partner
     and its Affiliates  pursuant to demand registration  rights,  provided that
     the party exercising the demand  registration may, at any time,  abandon or
     delay any such registration  initiated by it. If the proposed offering upon
     which the holders of Registrable Securities exercise their piggyback rights
     shall be an  underwritten  offering,  then,  in the event that the managing
     underwriter  or  managing   underwriters   of  such  offering   advise  the
     Partnership  and the  Holders  electing  to  exercise  piggyback  rights in
     writing  that in  their  opinion  the  inclusion  of all of  such  Holder's
     Partnership Securities would adversely and materially affect the success of
     the offering,  the securities that shall be included in such offering shall
     be  allocated  among  the  Partnership  or the  parties  exercising  demand
     registration  rights, as applicable,  and the Holders exercising  piggyback
     registration  rights in proportion  to the total number of securities  that
     the Partnership or the parties  exercising demand  registration  rights, as
     applicable,  propose  to

<page>
     register in relation to the total number of Registrable Securities that the
     Holders exercising piggyback registration rights propose to register.

     The Partnership  will cause a demand  registration to remain  effective for
     180 days, unless all securities covered by such registration have been sold
     (Section 2.1(a)(ii).

     The  Partnership  may  postpone  a  demand  registration  90  days  if such
     postponement  is in the best interests of the  Partnership and its partners
     due a pending transaction, investigation or event (Section 2).

     In the event a demand registration involves an underwritten  offering,  the
     underwriter(s)  shall be selected by the Holders and reasonably  acceptable
     to the Partnership (Section 2.1(d)).

     Registration  rights will not terminate until the later of (i) December 31,
     2010,  (ii) 2 years  following the withdrawal of the General Partner as the
     general partner of the Partnership or (iii) the termination of registration
     rights granted to the General Partner and its affiliates (Section 2.3).

     The Partnership  represents and covenants that any  registration  statement
     covering sales by a Holder pursuant to the  Registration  Rights  Agreement
     will not contain material misstatements or omissions.

     The  obligation of the  Partnership  to amend or supplement a prospectus to
     keep a registration  statement available for use may be suspended for up to
     30 consecutive and 60  non-consecutive  days if the amendment or supplement
     would require the disclosure of information that the Partnership has a bona
     fide business purpose for keeping confidential (Section 3(b)).

     The Holders will agree to market-standoff for a period of 180 days from the
     date of request to standoff (Section 5(a)).

     Holders will not be required to indemnify,  or provide contribution to, the
     Partnership for losses arising from the registration of securities pursuant
     to the Registration Rights Agreement (Section 6(b) and Section 6(d)).

     Each Holder represents and covenants that any information  provided by such
     Holder with respect to a registration  pursuant to the Registration  Rights
     Agreement will not contain  material  misstatements  or omissions  (Section
     6(b)).

     Each Holder may assign or subdivide its rights pursuant to the Registration
     Rights  Agreement  directly  to no more than  four  Persons  without  prior
     written consent of the Partnership (Section 8).

     The  Partnership  agrees to enter into customary  underwriting  agreements,
     cooperate in any due diligence  conducted by  underwriters,  and deliver or
     cause to be  delivered  to the

<page>

     Holders and the underwriters, if any, any certificates, opinions or comfort
     letters customarily required.

     The  Partnership  agrees to  facilitate  the  delivery  of the  Registrable
     Securities  upon any sale by a Holder pursuant to the  Registration  Rights
     Agreement.

     The undersigned  parties agree that the foregoing will be effective for all
purposes under the Combination Agreement and the agreements  contemplated by it.
The undersigned  parties shall amend and restate the documents referred to above
that have previously been executed and will revise such documents that are to be
executed at closing,  each in a manner consistent with the foregoing,  and shall
execute such documents as amended and restated or revised, as applicable, at the
closing of the combination transaction.




                    [SIGNATURES APPEAR ON THE FOLLOWING PAGE]
<page>

     Each of the  undersigned  parties  has caused this letter to be executed on
its behalf by its representative  thereunto duly authorized,  all as of the date
first above written.


                                DORCHESTER HUGOTON, LTD.

                                By: P.A. Peak, Inc., General Partner

                                    By:____________________________

                                By: James E. Raley, Inc., General Partner

                                    By:____________________________



                                REPUBLIC ROYALTY COMPANY

                                By: SAM Partners, Ltd., General Partner

                                     By: SAM Partners, Inc., General Partner

                                         By:_______________________


                                By: Vaughn Petroleum, Ltd., General Partner

                                    By: VPL(GP), LLC, General Partner

                                        By:________________________



                                SPINNAKER ROYALTY COMPANY, L.P.

                                By: Smith Allen Oil & Gas, Inc., General Partner

                                    By:____________________________

<page>
                                DORCHESTER MINERALS, L.P.

                                By: Dorchester Minerals Management LP,
                                    General Partner

                                    By: Dorchester Minerals Management GP LLC,
                                        General Partner

                                        By:________________________



                                DORCHESTER MINERALS MANAGEMENT LP

                                By: Dorchester Minerals Management GP LLC,
                                    General Partner

                                    By:____________________________



                                DORCHESTER MINERALS MANAGEMENT GP LLC

                                By:________________________________



                                DORCHESTER MINERALS OPERATING LP

                                By: Dorchester Minerals Operating GP LLC,
                                    General Partner

                                     By:___________________________



                                DORCHESTER MINERALS OPERATING GP LLC

                                By:________________________________



                                P.A. PEAK, INC.

                                By:________________________________



                                JAMES E. RALEY, INC.

                                By:________________________________



                                SAM PARTNERS, LTD.

                                By: SAM Partners, Inc., General Partner

                                    By:____________________________



                                VAUGHN PETROLEUM, LTD.

                                By: VPL(GP), LLC, General Partner

                                    By:____________________________



                                SMITH ALLEN OIL & GAS, INC.

                                By:________________________________



                                ___________________________________
                                William Casey McManemin



                                ___________________________________
                                H.C. Allen, Jr.



                                ___________________________________
                                James E. Raley



<page>
                                                               EXHIBIT A

     The  following  shall be inserted as a new Section 13.4 of the  Partnership
     Agreement and the subsequent sections shall be renumbered.

SECTION 13.4.     Annual Meetings.

     (a) Beginning in 2004, an annual meeting of Limited  Partners shall be held
for  the  election  of the  members  of the  Advisory  Committee,  on the  first
Wednesday of May if not a legal holiday, and if a legal holiday then on the next
business  day  following,  at  10:00  a.m.,  or at such  date and time as may be
designated  by  resolution of the Board of Managers from time to time and stated
in the notice of the meeting,  to elect the members of the Advisory Committee by
a plurality and to transact such other  business as is properly  brought  before
the  meeting in  accordance  with this  Agreement.  Annual  meetings  of Limited
Partners  shall be held at such  place,  either  within or without  the State of
Delaware,  as shall be designated from time to time by the Board of Managers and
stated in the  notice of the  meeting.  Written  notice  of the  annual  meeting
stating the place,  date and hour of the meeting  shall be given to each Limited
Partner entitled to vote at such meeting and holding of record not less than ten
(10) nor more than sixty (60) days before the date of the meeting.

     (b) To be  properly  brought  before an annual  meeting,  business  must be
either (i) specified in the notice of meeting (or any supplement  thereto) given
by or at the direction of the Board of Managers, (ii) otherwise properly brought
before the meeting by or at the  direction  of the Board of  Managers,  or (iii)
otherwise  (A) be  properly  requested  to be brought  before  the  meeting by a
Limited Partner of record entitled to vote in the election of the members of the
Advisory  Committee  generally and (B) constitute a proper subject to be brought
before the  meeting.  In order for  business  (other  than the  election  of the
members of the  Advisory  Committee)  to be properly  brought  before the annual
meeting of Limited Partners by a Limited  Partner,  the business must be legally
proper, and written notice of such Limited Partner's intent to bring such matter
before the  annual  meeting of Limited  Partners  must be  delivered,  either by
personal  delivery or by United  States mail,  postage  prepaid,  to the General
Partner of the Partnership.  Such notice must be received by the General Partner
not later than 60 days in advance of such  meeting if such meeting is to be held
on a day which is within  30 days  preceding  the  anniversary  of the  previous
year's annual meeting,  or 90 days in advance of such meeting if such meeting is
to be held on or after the anniversary of the previous year's annual meeting.  A
Limited  Partner's  notice  to the  General  Partner  shall set forth as to each
matter the  Limited  Partner  proposes  to bring  before  the annual  meeting of
Limited Partners:  (i) a brief description of the business desired to be brought
before the meeting and the reasons for conducting  such business at the meeting,
(ii) the name and address,  as they appear on the  Partnership's  books,  of the
Limited Partner  proposing such business,  (iii) the class and number of Limited
Partnership Interests of the Partnership which are owned by such Limited Partner
and (iv) any  material  interest of the  Limited  Partner in such  business.  No
business  brought by a Limited  Partner shall be conducted at the annual meeting
of Limited  Partners  except in accordance with the procedures set forth in this
Section  13.4(b).  The filing of a Limited  Partner  notice as  required by this
Section  13.4(b)  shall not, in and of itself,  constitute  the  bringing of the
business  described  therein  before the annual  meeting.  The  chairman  of the
meeting shall, if the facts warrant, determine that (1) the business proposed to
be brought before the meeting is not a

<page>

proper subject therefor and/or (2) such business was not properly brought before
the  meeting  in  accordance  with the  provisions  hereof,  and if he should so
determine,  he shall declare to the meeting that (1) the business proposed to be
brought  before the  meeting  is not a proper  subject  thereof  and/or (2) such
business  was  not  properly  brought  before  the  meeting  and  shall  not  be
transacted.

     (c) Nominations  for the election of the members of the Advisory  Committee
shall be made by the  General  Partner  and may be made by any  Limited  Partner
entitled to vote for the election of the members of the Advisory  Committee  and
holding of record.  Any Limited Partner entitled to vote for the election of the
members of the Advisory  Committee at a meeting  (i.e.,  any Limited  Partner of
record) may nominate persons for election as a member of the Advisory  Committee
only if written notice of such Limited  Partner's intent to make such nomination
is given, either by personal delivery or by United States mail, postage prepaid,
to the General  Partner of the  Partnership not later than 90 days in advance of
such meeting.  Each such notice shall set forth: (1) the name and address of the
Limited  Partner who intends to make the  nomination of the person or persons to
be  nominated;  (2) the name of the  person or persons  to be  nominated;  (3) a
representation  that the  Limited  Partner  is a holder  of  record  of  Limited
Partnership  Interests of the  Partnership  entitled to vote at such meeting and
intends to appear in person or by proxy at the meeting to nominate the person or
persons  specified  in the notice;  (4) a  description  of all  arrangements  or
understandings between the Limited Partner and each nominee and any other person
or persons  (naming such person or persons)  pursuant to which the nomination or
nominations are to be made by the Limited  Partner;  (5) such other  information
regarding  each  nominee  proposed  by such  Limited  Partner as would have been
required to be included in a proxy  statement  filed pursuant to the proxy rules
of the Securities and Exchange  Commission had each nominee been  nominated,  or
intended to be nominated, by the General Partner; and (6) the written consent of
each nominee to serve as a member of the Advisory  Committee if so elected.  The
filing of a Limited  Partner  notice as required by this Section  13.4(c)  shall
not,  in and of itself,  constitute  the making of the  nomination(s)  described
therein.  In order for the  nomination of a person to be effective,  the Limited
Partner who files the notice of intent to nominate  such person  shall also make
the  nomination  at the  meeting.  The  chairman  of the  meeting  may refuse to
acknowledge  the  nomination  of any  person  not  made in  compliance  with the
foregoing procedure.

     (d) Newly created  memberships on the Advisory Committee resulting from any
increase in the  authorized  number of members of the Advisory  Committee may be
filled by the General Partner in accordance with the limited  liability  company
agreement  of its  general  partner.  In the event of a vacancy on the  Advisory
Committee,  the member of the general  partner of the General  Partner that held
the  appointment  or  nomination  right,  as  applicable,  with  respect to such
vacating member shall have the right,  pursuant to the limited liability company
agreement of the general partner of the General Partner, to nominate,  and cause
the General Partner to appoint, a replacement member of the Advisory  Committee.
A member of the Advisory Committee  appointed to fill a newly created membership
or a vacancy in accordance  with the foregoing shall serve until the next annual
meeting of limited partners.

     (e) In addition to any other applicable requirements, for a Limited Partner
proposal to be considered for inclusion in the Partnership's proxy statement for
the  annual  meeting,  the  Limited  Partner  must  have  satisfied  all  of the
conditions  set forth in Rule 14a-8  promulgated  by

<page>

the Securities  and Exchange  Commission  under the  Securities  Exchange Act of
1934, as amended (the "Exchange Act"), or any successor rule thereto (the "Proxy
Rules"),  including  particularly  the requirement that the Limited Partner give
timely written notice of the proposal to the Partnership.

The following shall be inserted into Section 13.10, as renumbered.

     Members of the  Advisory  Committee  shall be elected by a plurality of the
votes of the Outstanding  Limited Interests present in person or by proxy at the
meeting  and  entitled to vote on the  election  of the members of the  Advisory
Committee.

The following shall be inserted into Section 13.5, as renumbered.

     A Limited  Partner's  request to the General  Partner shall set forth as to
each matter the Limited Partner  proposes to bring before the special meeting of
Limited Partners:  (i) a brief description of the business desired to be brought
before the meeting and the reasons for conducting  such business at the meeting,
(ii) the name and address,  as they appear on the  Partnership's  books,  of the
Limited Partner  proposing such business,  (iii) the class and number of Limited
Partnership Interests of the Partnership which are owned by such Limited Partner
and (iv) any  material  interest of the  Limited  Partner in such  business.  No
business  brought by a Limited  Partner shall be conducted at the annual meeting
of Limited  Partners  except in accordance with the procedures set forth in this
Section 13.5.  Notwithstanding  anything to the contrary,  the Limited  Partners
shall only be entitled to call one special meeting every twelve (12) months.

The following shall be inserted into Section 13.11, as renumbered.

     Notwithstanding  anything in this  Agreement to the  contrary,  no business
shall be conducted at a meeting  except in accordance  with the  procedures  and
conditions  set  forth in this  Article  XIII,  and the Proxy  Rules;  provided,
however, that nothing in this Article XIII or the Proxy Rules shall be deemed to
preclude  discussion  of any business  properly  brought  before a meeting.  The
chairman of the meeting shall,  if the facts  warrant,  determine and declare to
the  meeting  that  business  was not  properly  brought  before the  meeting in
accordance  with the  provisions  of this  Article  XIII,  and if he  should  so
determine, he shall so declare to the meeting and any such business not properly
brought before the meeting shall not be transacted.



     THE FOREGOING DOES NOT CONSTITUTE AN OFFER TO BUY, OR THE  SOLICITATION  OF
AN OFFER TO BUY, ANY SECURITIES. THE SECURITIES TO BE OFFERED IN CONNECTION WITH
THE PROPOSED  TRANSACTION  WILL BE OFFERED ONLY  PURSUANT TO A  PROSPECTUS/PROXY
STATEMENT INCLUDED IN A REGISTRATION STATEMENT FILED UNDER THE SECURITIES ACT OF
1933, AS AMENDED.

     ALL PARTNERS OF DORCHESTER  HUGOTON,  REPUBLIC AND SPINNAKER ARE ADVISED TO
READ THE PROSPECTUS/PROXY  STATEMENT,  AND SUPPLEMENTS  THERETO,  FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION AND THE RELATED  SOLICITATION/RECOMMENDATIONS
THAT WILL BE PROVIDED TO EACH PARTNER  REQUESTING SUCH PARTNER'S  VOTE,  BECAUSE
THESE   DOCUMENTS   WILL   CONTAIN   IMPORTANT   INFORMATION.   A  COPY  OF  THE
PROSPECTUS/PROXY STATEMENT AND RELATED  SOLICITATION/RECOMMENDATIONS WERE MAILED
TO PARTNERS ON OCTOBER 31, 2002 AND  SUPPLEMENT  NO. 1 WAS MAILED  DECEMBER  13,
2002 AND ARE  AVAILABLE  FROM  DORCHESTER  HUGOTON,  REPUBLIC  AND  SPINNAKER ON
REQUEST.  THE  PROSPECTUS/PROXY  STATEMENT,   SUPPLEMENTS  THERETO  AND  RELATED
SOLICITATION/RECOMMENDATIONS ARE AVAILABLE ON THE INTERNET AT THE SECURITIES AND
EXCHANGE COMMISSION'S WORLD WIDE WEB SITE AT HTTP://WWW.SEC.GOV.

     Dorchester  Hugoton,  Republic and Spinnaker and their  respective  General
Partners,  directors  and/or  officers,  as applicable,  may be deemed under the
Rules of the  Securities  and Exchange  Commission  to be  "participants  in the
solicitation"  of  proxies  from the  security  holders of  Dorchester  Hugoton,
Republic  and  Spinnaker  in  favor  of the  transaction.  SECURITY  HOLDERS  OF
DORCHESTER HUGOTON,  REPUBLIC AND SPINNAKER MAY OBTAIN INFORMATION REGARDING THE
INTERESTS   OF  THE   "PARTICIPANTS   IN  THE   SOLICITATION"   BY  READING  THE
PROSPECTUS/PROXY STATEMENT AND SUPPLEMENTS THERETO RELATING TO THE TRANSACTION.