MESA ROYALTY TRUST/TX
10-K405, 2000-03-27
OIL ROYALTY TRADERS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-K

[X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT
    OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 1999

[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE
    ACT OF 1934 FOR THE TRANSITION PERIOD FROM ______ TO _____

                         COMMISSION FILE NUMBER 1-7884

                               MESA ROYALTY TRUST
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                     TEXAS                                 74-6284806
        (STATE OR OTHER JURISDICTION OF                 (I.R.S. EMPLOYER
        INCORPORATION OR ORGANIZATION)                 IDENTIFICATION NO.)
             CHASE BANK OF TEXAS,
             NATIONAL ASSOCIATION
           CORPORATE TRUST DIVISION
                712 MAIN STREET
                HOUSTON, TEXAS                                77002
   (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                (ZIP CODE)

       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: 1-800-852-1422

          SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:

                                                   NAME OF EACH EXCHANGE ON
             TITLE OF EACH CLASS                        WHICH REGISTERED
        UNITS OF BENEFICIAL INTEREST                NEW YORK STOCK EXCHANGE

          SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT:

                                      NONE

     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes [X] No [ ]

     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

     The aggregate market value of 1,863,590 Units of Beneficial Interest in
Mesa Royalty Trust held by non-affiliates of the registrant at the closing sales
price on March 24, 2000, of $42.75 was approximately $79,668,473.

     Indicate the number of shares outstanding of each of the registrant's
classes of common stock, as of the latest practicable date.

     As of March 24, 2000, 1,863,590 Units of Beneficial Interest in Mesa
Royalty Trust.

     Documents Incorporated By Reference: None.

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<PAGE>
                               TABLE OF CONTENTS

                                     PART I

<TABLE>
<CAPTION>
                                                                                                              PAGE
<S>        <C>                                                                                                <C>
Item  1.   Business........................................................................................     1
                                                                                                                1
           Description of the Trust........................................................................
                                                                                                                2
           Description of the Units........................................................................
                                                                                                                5
           Description of Royalty Properties...............................................................
                                                                                                               17
           Contracts.......................................................................................
                                                                                                               18
           Regulation and Prices...........................................................................
Item  2.   Properties......................................................................................    19
Item  3.   Legal Proceedings...............................................................................    19
Item  4.   Submission of Matters to a Vote of Security Holders.............................................    19
</TABLE>

                                    PART II

<TABLE>
<S>        <C>                                                                                                <C>
Item  5.   Market for the Registrant's Common Equity and Related Unitholder Matters........................    20
Item  6.   Selected Financial Data.........................................................................    20
Item  7.   Management's Discussion and Analysis of Financial Condition and Results of                          20
             Operations....................................................................................
                                                                                                               22
           Summary of Royalty Income, Production and Average Prices (Unaudited)............................
Item  8.   Financial Statements and Supplementary Data.....................................................    23
Item  9.   Changes in and Disagreements with Accountants on Accounting and Financial                           30
             Disclosure....................................................................................
</TABLE>

                                    PART III

<TABLE>
<S>        <C>                                                                                                <C>
Item 10.   Directors and Executive Officers of the Registrant..............................................    30
Item 11.   Executive Compensation..........................................................................    30
Item 12.   Security Ownership of Certain Beneficial Owners and Management..................................    30
Item 13.   Certain Relationships and Related Transactions..................................................    31
</TABLE>

                                    PART IV

<TABLE>
<S>        <C>                                                                                                <C>
Item 14.   Exhibits, Financial Statement Schedules, and Reports on Form 8-K................................    31
SIGNATURES.................................................................................................    32
</TABLE>

NOTE REGARDING FORWARD-LOOKING STATEMENTS

     This Form 10-K includes "forward-looking statements" within the meaning
of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the
Securities Exchange Act of 1934, as amended. All statements other than
statements of historical facts included in this Form 10-K are forward-looking
statements. Although the Working Interest Owners have advised the Trust that
they believe that the expectations reflected in the forward-looking statements
contained herein are reasonable, no assurance can be given that such
expectations will prove to have been correct. Important factors that could cause
actual results to differ materially from expectations ("Cautionary
Statements") are disclosed in this Form 10-K, including without limitation in
conjunction with the forward-looking statements included in this Form 10-K. All
subsequent written and oral forward-looking statements attributable to the Trust
or persons acting on its behalf are expressly qualified in their entirety by the
Cautionary Statements.

<PAGE>
                                     PART I

ITEM 1.  BUSINESS.

                            DESCRIPTION OF THE TRUST

     The Mesa Royalty Trust (the "Trust"), created under the laws of the State
of Texas, maintains its offices at the office of the Trustee, Chase Bank of
Texas, National Association (the "Trustee"), 712 Main Street, Houston, Texas
77002. The telephone number of the Trust is 1-800-852-1422.

     The Trust was created on November 1, 1979 when Mesa Petroleum Co. conveyed
to the Trust a 90% net profits overriding royalty interest (the "Royalty") in
certain producing oil and gas properties located in the Hugoton field of Kansas,
the San Juan Basin field of New Mexico and Colorado, and the Yellow Creek field
of Wyoming (collectively, the "Royalty Properties"). Mesa Petroleum Co. was the
predecessor to Mesa Limited Partnership ("MLP") which was the predecessor to
MESA Inc. On April 30, 1991, MLP sold its interests in the Royalty Properties
located in the San Juan Basin field to Conoco Inc. ("Conoco"). Conoco sold the
portion of its interests in the San Juan Basin Royalty Properties located in
Colorado to MarkWest Energy Partners, Ltd. (effective January 1, 1993) and Red
Willow Production Company (effective April 1, 1992). On October 26, 1994,
MarkWest Energy Partners, Ltd. sold substantially all of its interest in the
Colorado San Juan Basin Royalty Properties to Amoco Production Company
("Amoco"), a subsidiary of BP Amoco. Until August 7, 1997, MESA Inc. operated
the Hugoton Royalty Properties through Mesa Operating Co., a wholly owned
subsidiary of MESA Inc. On August 7, 1997, MESA Inc. merged with and into
Pioneer Natural Resources Company ("Pioneer"), formerly a wholly owned
subsidiary of MESA, Inc., and Parker & Parsley Petroleum Company merged with and
into Pioneer Natural Resources USA, Inc. (successor to Mesa Operating Co.), a
wholly owned subsidiary of Pioneer ("PNR") (collectively, the mergers are
referred to herein as the "Merger"). Subsequent to the Merger, the Hugoton
Royalty Properties have been operated by PNR. The San Juan Basin Royalty
Properties located in New Mexico are operated by Conoco. The San Juan Basin
Royalty Properties located in Colorado are operated by Amoco. As used in this
report, PNR refers to the operator of the Hugoton Royalty Properties, Conoco
refers to the operator of the New Mexico San Juan Basin Royalty Properties and
Amoco refers to the operator of the Colorado San Juan Basin Royalty Properties,
unless otherwise indicated. The terms "working interest owner" and "working
interest owners" generally refer to the operators of the Royalty Properties as
described above, unless the context in which such terms are used indicates
otherwise.

     The terms of the Mesa Royalty Trust Indenture (the "Trust Indenture")
provide, among other things, that:  (1) the Trust cannot engage in any business
or investment activity or purchase any assets; (2) the Royalty can be sold in
part or in total for cash upon approval of the unitholders; (3) the Trustee can
establish cash reserves and borrow funds to pay liabilities of the Trust and can
pledge the assets of the Trust to secure payment of the borrowings; (4) in
January, April, July and October of each year the Trustee will make quarterly
distributions of cash available for distribution to the unitholders; and (5) the
Trust will terminate upon the first to occur of the following events: (i) at
such time as the Trust's royalty income for each of two successive years is less
than $250,000 per year or (ii) a vote of the unitholders in favor of
termination. Royalty income of the Trust was $5,475,497 and $6,209,778 for the
years 1999 and 1998, respectively. Upon termination of the Trust, the Trustee
will sell for cash all the assets held in the Trust estate and make a final
distribution to unitholders of any funds remaining after all Trust liabilities
have been satisfied.

     Under the instrument conveying the Royalty to the Trust (the
"Conveyance"), the Trust is entitled to a percentage of the Net Proceeds, as
hereinafter defined, realized from the minerals as, if and when produced from
the Royalty Properties. See "Description of Royalty Properties." The
Conveyance provides for a monthly computation of Net Proceeds. "Net Proceeds"
means the excess of Gross Proceeds, as hereinafter defined, received by the
working interest owners during a particular period over operating and capital
costs for such period. "Gross Proceeds" means the amount received by the
working interest owners from the sale of minerals covered by the Royalty,
subject to certain

                                       1
<PAGE>
adjustments. Operating costs means, generally, costs incurred on an accrual
basis by the working interest owners in operating the Royalty Properties,
including capital and non-capital costs. If operating and capital costs exceed
Gross Proceeds for any month, the excess plus interest thereon at 120% of the
prime rate of Bank of America is recovered out of future Gross Proceeds prior to
the making of further payment to the Trust. The Trust, however, is generally not
liable for any operating costs or other costs or liabilities attributable to the
Royalty Properties or minerals produced therefrom. The Trust is not obligated to
return any royalty income received in any period. The working interest owners
are required to maintain books and records sufficient to determine the amounts
payable under the Royalty. Additionally, in the event of a controversy between a
working interest owner and any purchaser as to the correct sales price for any
production, amounts received by such working interest owner and promptly
deposited by it with an escrow agent are not considered to have been received by
such working interest owner and therefore are not subject to being payable with
respect to the Royalty until the controversy is resolved; but all amounts
thereafter paid to such working interest owner by the escrow agent will be
considered amounts received from the sale of production. Similarly, operating
costs include any amounts a working interest owner is required to pay whether as
a refund, interest or penalty to any purchaser because the amount initially
received by such working interest owner as the sales price was in excess of that
permitted by the terms of any applicable contract, statute, regulation, order,
decree or other obligation. Within 30 days following the close of each calendar
quarter, the working interest owners are required to deliver to the Trustee a
statement of the computation of Net Proceeds attributable to such quarter.

     The brief discussions of the Trust Indenture and the Conveyance contained
herein are qualified in their entirety by reference to the Trust Indenture and
the Conveyance themselves, which are exhibits to this Form 10-K and are
available upon request from the Trustee.

     The Royalty Properties are required to be operated by the working interest
owners in accordance with reasonable and prudent business judgment and good oil
and gas field practices. Each working interest owner has the right to abandon
any well or lease if, in its opinion, such well or lease ceases to produce or is
not capable of producing oil, gas or other minerals in commercial quantities.
Each working interest owner markets the production on terms deemed by it to be
the best reasonably obtainable in the circumstances. See "Contracts". The
Trustee has no power or authority to exercise any control over the operation of
the Royalty Properties or the marketing of production therefrom.

     In 1985 the Trust Indenture was amended at a special meeting of
unitholders. The effect of the amendment was an overall reduction of
approximately 89% in the size of the Trust, distributable income and related
Trust reserves, effective April 1, 1985. See Note 2 in the Notes to Financial
Statements under Item 8 of this Form 10-K.

     The Trust has no employees. Administrative functions of the Trust are
performed by the Trustee.

                            DESCRIPTION OF THE UNITS

     Each unit is evidenced by a transferable certificate issued by the Trustee.
Each unit ranks equally for purposes of distributions and has one vote on any
matter submitted to unitholders. A total of 1,863,590 units were outstanding at
March 24, 2000.

DISTRIBUTIONS

     The Trustee determines for each month the amount of cash available for
distribution for such month. Such amount (the "Monthly Distribution Amount")
consists of the cash received from the Royalty during such month less the
obligations of the Trust paid during such month, adjusted for changes made by
the Trustee during such month in any cash reserves established for the payment
of contingent or future obligations of the Trust. The Monthly Distribution
Amount for each month is payable to unitholders of record on the monthly record
date (the "Monthly Record Date") which is the close of business on the last
business day of such month or such other date as the Trustee determines is
required to comply with legal or stock exchange requirements. However, to reduce
the administrative

                                       2
<PAGE>
expenses of the Trust, under the Trust Indenture the Trustee does not distribute
cash monthly, but rather, during January, April, July and October of each year
distributes to each person who was a unitholder of record on one or more of the
immediately preceding three Monthly Record Dates, the Monthly Distribution
Amount for the month or months that he was a unitholder of record, together with
interest earned on such Monthly Distribution Amount from the Monthly Record Date
to the payment date. Under the terms of the Trust Indenture, interest is earned
at a rate of 1 1/2% below the prime rate charged by Chase Bank of Texas,
National Association or the interest rate which Chase Bank of Texas, National
Association pays in the normal course of business on amounts placed with it,
whichever is greater.

LIABILITY OF UNITHOLDERS

     As regards the unitholders, the Trustee is fully liable if the Trustee
incurs any liability without ensuring that such liability will be satisfiable
only out of the Trust assets (regardless of whether the assets are adequate to
satisfy the liability) and in no event out of amounts distributed to, or other
assets owned by, unitholders. However, under Texas law, it is unclear whether a
unitholder would be jointly and severally liable for any liability of the Trust
in the event that all of the following conditions were to occur: (1) the
satisfaction of such liability was not by contract limited to the assets of the
Trust, (2) the assets of the Trust were insufficient to discharge such liability
and (3) the assets of the Trustee were insufficient to discharge such liability.
Although each unitholder should weigh this potential exposure in deciding
whether to retain or transfer his units, the Trustee is of the opinion that
because of the substantial value and passive nature of the Trust assets, the
restrictions on the power of the Trustee to incur liabilities and the required
financial net worth of any trustee, the imposition of any liability on a
unitholder is extremely unlikely.

FEDERAL INCOME TAX MATTERS

     In a technical advice memorandum dated February 26, 1982, the National
Office of the Internal Revenue Service ("IRS") advised the Dallas District
Director that the Trust is classifiable as a grantor trust and not as an
association taxable as a corporation.

  INCOME AND DEPLETION

     Royalty income, net of depletion and severance taxes, is treated as
portfolio income, and subject to certain exceptions and transitional rules,
royalty income cannot be offset by losses from passive businesses. Additionally,
interest income is portfolio income. Administrative expense is an investment
expense.

     Generally, prior to the Revenue Reconciliation Act of 1990, the transferee
of an oil and gas property could not claim percentage depletion with respect to
production from such property if it was "proved" at the time of the transfer.
This rule is not applicable in the case of transfers of properties after October
11, 1990. Thus, eligible unitholders that acquired units after that date are
entitled to claim an allowance for percentage depletion with respect to royalty
income attributable to these units to the extent that this allowance exceeds
cost depletion as computed for the relevant period.

  SECTION 29 CREDIT

     The Trust receives royalty payments attributable to coal seam gas
production from the Fruitland Coal Formation properties. Thus, unitholders are
potentially eligible to claim their share of the tax credit attributable to this
qualifying production. Each unitholder should consult his tax advisor regarding
the limitations and requirements for claiming this tax credit.

  BACKUP WITHHOLDING

     Distributions from the Trust are generally subject to backup withholding at
a rate of 31% of these distributions. Backup withholding will not normally apply
to distributions to a unitholder, however, unless a unitholder fails to properly
provide to the Trust his taxpayer identification number ("TIN") or the IRS
notifies the Trust that the TIN provided by a unitholder is incorrect.

                                       3
<PAGE>
  SALE OF UNITS

     Generally, except for recapture items, the sale, exchange or other
disposition of a unit will result in capital gain or loss measured by the
difference between the basis in the unit and the amount realized. This gain or
loss would be capital gain or loss if the unit was held by the unitholder as a
capital asset, either long-term or short-term depending on the holding period of
the unit. This capital gain or loss will be long-term if a unitholder's holding
period exceeded one year as of the date of sale or exchange. A long-term capital
gains rate of 20% applies to most capital assets sold with a holding period of
more than one year. Capital gain or loss will be short-term if the unit has not
been held for more than one year at the time of disposition. Effective for
property placed in service after December 31, 1986, the amount of gain, if any,
realized upon the disposition of oil and gas property is treated as ordinary
income to the extent of the intangible drilling and development costs incurred
with respect to the property and depletion claimed with respect to such property
to the extent it reduced the taxpayer's basis in the property. Under this
provision, depletion attributable to a unit acquired after 1986 will be subject
to recapture as ordinary income upon disposition of the unit or upon disposition
of the oil and gas property to which the depletion is attributable. The balance
of any gain or any loss will be capital gain or loss, if such unit was held by
the unitholder as a capital asset.

  FOREIGN UNITHOLDERS

     In general, a unitholder who is a nonresident alien individual or which is
a foreign corporation (each, a "Foreign Taxpayer") will be subject to tax on
the gross income produced by the Royalty at a rate equal to 30% (or lower treaty
rate, if applicable). This tax will be withheld by the Trustee and remitted
directly to the United States Treasury. A Foreign Taxpayer may elect to treat
the income from the Royalty as effectively connected with the conduct of a
United States trade or business under section 871 or section 882 of the Internal
Revenue Code of 1986, as amended (the "Code") (or pursuant to any similar
provisions of applicable treaties). Upon making this election a unitholder is
entitled to claim all deductions with respect to that income, but he must file a
United States federal income tax return to claim these deductions. This election
once made is irrevocable (unless an applicable treaty allows the election to be
made annually).

     Section 897 of the Code and the Treasury Regulations thereunder treat the
publicly traded Trust as if it were a United States real property holding
corporation. Accordingly, Foreign Taxpayers owning greater than 5% of the
outstanding units are subject to United States federal income tax on the gain on
the disposition of their units. Foreign unitholders owning less than 5% of the
outstanding units are not subject to United States federal income tax on the
gain on the disposition of their units.

     Federal income taxation of a Foreign Taxpayer is a highly complex matter
which may be affected by many other considerations. Therefore, each Foreign
Taxpayer should consult with his own tax adviser as to the advisability of his
ownership of units.

                                       4
<PAGE>
                       DESCRIPTION OF ROYALTY PROPERTIES

PRODUCING ACREAGE AND WELLS AS OF DECEMBER 31, 1999

<TABLE>
<CAPTION>
                                                                                  PRODUCING GAS
                                                      PRODUCING ACRES(1)           WELLS(1)(2)
                                                     --------------------        ----------------
                                                      GROSS         NET          GROSS       NET
<S>                                                  <C>          <C>            <C>        <C>
                                                     -------      -------        -----      -----
Hugoton Area (Kansas)(3)..........................   103,364      103,114         466       465.5
San Juan Basin (Northwestern New Mexico and
  Southwestern Colorado)..........................    40,716       31,328         371       189.7
                                                     -------      -------        -----      -----
           Total..................................   144,080      134,442         837       655.2
                                                     =======      =======        =====      =====
</TABLE>

- ------------

(1) The Trust does not have a working interest in the producing acres and
    producing gas wells. The gross and net amounts in the table above represent
    gross and net amounts attributable to the working interest owners and are
    the basis for the Gross Proceeds amounts discussed under "Description of
    the Trust".

(2) One or more completions in the same bore hole are counted as one well. Where
    multiple well bores are in a single production unit, the unit is counted as
    one well.

(3) Includes 151 gross and net infill gas wells.

HUGOTON

     The principal property interest conveyed to the Trust accounts for
approximately 49% of the Trust's reserves and was carved out of PNR's working
interest in 104,437 net producing acres in the Hugoton field. The life of the
field is expected to extend beyond the year 2020.

     The gas produced from the Hugoton properties is available for sale on the
spot market. See "Contracts". Since the Hugoton field gas is sold in the
intrastate and interstate markets, it is subject to state and federal laws and
regulations. The Kansas Corporation Commission (the "KCC") is the state
regulatory agency responsible for setting field market demand (gas allowables),
prorating production between wells and other related matters. Hugoton field gas
is also subject to the rules and regulations of the Federal Energy Regulatory
Commission (the "FERC"). See "Regulation and Prices".

SAN JUAN BASIN

     The Trust's interest in the San Juan Basin was conveyed from PNR's working
interest in 31,328 net producing acres in northwestern New Mexico and
southwestern Colorado. The San Juan Basin-New Mexico reserves represent
approximately 51% of the Trust's reserves. Substantially all of the natural gas
produced from the San Juan Basin is currently being sold on the spot market. PNR
completed the sale of its underlying interest in the San Juan Basin Royalty
Properties to Conoco on April 30, 1991. Conoco subsequently sold its underlying
interest in the Colorado portion of the San Juan Basin Royalty Properties to
MarkWest Energy Partners, Ltd. (effective January 1, 1993) and Red Willow
Production Company (effective April 1, 1992). On October 26, 1994, MarkWest
Energy Partners, Ltd. sold substantially all of its interest in the Colorado San
Juan Basin Royalty Properties to Amoco. See "Description of the Trust". The
San Juan Basin Royalty Properties located in Colorado account for less than 5%
of the Trust's reserves.

SAN JUAN BASIN FRUITLAND COAL DRILLING

     In April 1990, the working interest owner began drilling for coalbed
methane gas in the Fruitland Coal formation of the San Juan Basin. The Fruitland
Coal formation has been identified as one of the most prolific sources of U.S.
coalbed methane reserves. The Trust owns an interest in 26,700 gross acres and
25,400 net acres with Fruitland Coal potential. The working interest owner has
advised the Trust that, as of December 31, 1999, the working interest owner had
drilled on Trust properties 50 (29.3 net) Fruitland Coal wells, all of which are
operated by the working interest owner. Of such wells,

                                       5
<PAGE>
42 (24.6 net) have been successfully completed, of which 37 (21.7 net) are
currently producing at a combined rate of 73.4 (39.8 net) MMcf per day.

     The gas that is currently being produced from these wells is being sold on
the spot market, although the working interest owner has advised the Trust that
it will also consider selling some of the gas produced from these wells pursuant
to longer term contracts at spot market prices.

     Aggregate drilling and completion costs for the entire Fruitland Coal
development program were approximately $18.4 million. The Trust's share of the
total expenditures was approximately $2.4 million. The Trust's share of the cost
of drilling and completing the Fruitland Coal wells was subject to recovery by
the working interest owner on a state-by-state basis before distributions were
made from the San Juan Basin Royalty. In December 1992, after recovery by the
working interest owner of the costs of the Fruitland Coal drilling in New
Mexico, distributions from the New Mexico portion of the San Juan Basin Royalty
resumed. No distributions related to the Colorado portion of the San Juan Basin
Royalty have been made since 1990, as the costs of the Fruitland Coal drilling
in Colorado have not yet been recovered. The San Juan Basin development drilling
program had no effect on Royalty income or distributions relating to the Hugoton
Royalty.

     Conoco has informed the Trust that it believes the production from the
Fruitland Coal formation will generally qualify for the tax credits provided
under Section 29 of the Code. See "Description of the Units -- Federal Income
Tax Matters -- Section 29 Credit."

RESERVES

     A study of the proved oil and gas reserves attributable to the Hugoton
Royalty as of December 31, 1999 have been made by PNR. The following letter
relating to the "Reserves and Revenue as of December 31, 1999 From Certain
Properties Owned by Mesa Royalty Trust" (the "Hugoton Reserve Report")
summarizes such reserve study. References to the reserves of the Trust and the
future net revenue and present worth attributable to the Trust interest in the
Hugoton Reserve Report refer to the Trust's interest in the Hugoton Royalty
Properties. The Hugoton Reserve Report reflects estimated reserve quantities and
future net revenue in a manner which is based upon a month of production without
regard to time of receipt by the Trust and which differs from the manner in
which the Trust recognizes and accounts for its royalty income.

     A study of the proved oil and gas reserves attributable to the New Mexico
portion of the San Juan Basin Royalty as of December 31, 1999 has been made by
Conoco, the working interest owner of such properties. The Conoco Reserve Report
(together with the PNR Reserve Report, the "Reserve Reports") beginning on
page 13 regarding such properties reflects estimated reserve quantities.

     Proved oil and gas reserves attributable to the Colorado portion of the San
Juan Basin Royalty have been omitted from the Trust's reserve disclosures
included in this Form 10-K, as they represent less than 5% of the Trust's total
reserves and future net revenues.

     For further information regarding the Net Overriding Royalty Interest, the
Basis of Accounting for the Trust, and Reserves, see Notes 2, 3 and 6,
respectively, in the Notes to Financial Statements under Item 8 of this Form
10-K.

                                       6
<PAGE>
  March 20, 2000


  MESA Royalty Trust
  Chase Bank of Texas, N.A. (as Trustee)
  Chase Tower, Suite 1150
  600 Travis Street
  Houston TX 77002

  Ladies and Gentlemen:

  Pursuant to your request, we have prepared estimates, as of December 31, 1999
  of the extent and value of the proved natural gas liquids, natural gas and
  helium reserves of certain properties owned by the Mesa Royalty Trust,
  hereinafter referred to as the "Trust." The interest appraised consists of a
  10.29282 % (percent) net profits overriding royalty interest in certain
  properties administered by Pioneer Natural Resources USA, Inc., hereinafter
  referred to as "Pioneer." These properties are located in the Kansas Hugoton
  and Panoma-Council Grove fields in Kansas. Pioneer is 100 percent owned by
  Pioneer Natural Resources Company, the successor to Mesa Limited Partnership.

  The reserve estimates are based on a detailed study of the Trust's properties.
  The method or combination of methods used in the study of each reservoir was
  tempered by experience in the area, consideration of the state of development
  of the reservoir, and the quality and completeness of basic data.

  Reserves in this report are expressed as gross reserves and net reserves.
  Gross reserves are defined as the total estimated petroleum hydrocarbons
  remaining to be produced from the properties subsequent to December 31, 1999.
  Net reserves are defined as that portion of the gross reserves attributable to
  the Trust interest after deducting royalties and other interests owned by
  others.

  Values shown herein are expressed in terms of future net revenue, future net
  cashflow and present worth. Future net revenue is that revenue which will
  accrue to the appraised interests from the production and sale of the
  estimated net reserves. Future net cashflow is calculated by deducting
  estimated production taxes, ad valorem taxes, lease operating expenses, and
  capital costs from the future net revenue. Future income tax expenses were not
  taken into account in the preparation of these estimates. Present worth is
  defined as future net revenue discounted at a specified arbitrary discount
  rate compounded monthly over the expected period of realization. In this
  report, present worth values use a discount rate of 10 % (percent) are
  reported.

  Reserve and revenue values shown in this report were estimated from
  projections of reserves and revenue attributable to the combined Pioneer and
  Trust interests (Combined Interest) in these properties. To calculate the net
  profits, the future net revenue for the aggregate of the Combined Interest in
  the subject properties was reduced by an overhead charge and by the deficit
  balance as described below if any. In addition, because the net profits
  interest does not participate in plant and gathering expenses, a portion of
  the net revenue attributable to the plant interests was excluded from this
  calculation; the excluded portion is 35 percent of the plant revenue less 100
  percent of the plant and gathering expenses. When the adjusted net revenue
  resulting from this calculation was greater than zero, it was multiplied by
  the factor of 10.29282 % (percent) to arrive at the future net revenue of the
  Trust. If the adjusted revenue for the period was negative, the trust revenue
  was set to zero and interest was charged on the deficit balance. The beginning
  deficit balance as of December 31, 1999, was zero and no deficit is estimated
  for the life of the properties.

                                       7
<PAGE>
MESA Royalty Trust
March 20, 2000
Page 2


While estimates of reserves attributable to the Trust are shown in order to
comply with requirements of the SEC, there is no precise method of allocating
estimates of physical quantities of reserves between the working interest owners
and the Trust. The net profits overriding royalty interest is not a working
interest and the Trust does not own and is not entitled to receive any specific
volume of reserves from the Trust. Reserve quantities in the previously
mentioned reserve studies have been allocated based on the method referenced in
the Reserve Reports. The quantities of reserves attributable to the Trust will
be affected by future changes in various economic factors utilized in estimating
future gross and net revenues from the Trust Properties. Therefore, the
estimates of reserves set forth in the Reserve Reports are to a large extent
hypothetical and differ in significant respects from estimates of reserves
attributable to a working interest.

Estimates of reserves and future net revenue should be regarded only as
estimates that may change as further production history and additional
information becomes available. Not only are such reserve and revenue estimates
based on that information which is currently available, but such estimates are
also subject to the uncertainties inherent in the application of judgmental
factors in interpreting such information.

The development status shown herein represents the status applicable on December
31, 1999. In our preparation of the study, data available from wells drilled on
the appraised properties through December 31, 1999 were used in estimating gross
ultimate recovery. Gross production estimated to December 31, 1999 was deducted
from gross ultimate recovery to arrive at the estimates of gross reserves as of
December 31, 1999. In these fields, this required that the production rates be
estimated for up to three months, since production data for certain properties
were available only through September 1999.

Petroleum reserves included in this report are classified as proved and are
judged to be economically producible in future years from known reservoirs under
existing economic and operating conditions and assuming continuation of current
regulatory practices using conventional production methods and equipment. In the
analysis, reserves were estimated only to the limit of economic rates of
production under existing economic and operating conditions using prices and
costs as of the date the estimate is made. This included consideration of
changes in existing prices provided only by contractual arrangements but not
including escalations based upon future conditions. The petroleum reserves are
classified as follows:

Proved - Reserves that have been proved to a high degree of certainty by
analysis of the producing history of a reservoir and/or by volumetric analysis
of adequate geological and engineering data. Commercial productivity has been
established by actual production, successful testing, or in certain cases by
favorable core analyses and electrical-log interpretation when the producing
characteristics of the formation are known from nearby fields. Volumetrically,
the structure, areal extent, volume, and characteristics of the reservoir are
well defined by a reasonable interpretation of adequate subsurface well control
and by known continuity of hydrocarbon-saturated material above known fluid
contacts, if any, or above the lowest known structural occurrence of
hydrocarbons.

Developed - Reserves that are recoverable from existing wells with current
operating methods and expenses. Developed reserves include both producing and
non-producing reserves. Estimates of producing reserves assume recovery by
existing wells producing from present completion intervals with normal operating
methods and expenses. Developed non-producing reserves are in reservoirs behind
the casing or at minor depths below the producing zone and are considered proved
by production from other wells in the field, by successful drill-stem tests, or
by core analysis from the particular zones. Non-producing reserves require only
moderate expense to be brought into production.

Undeveloped - Reserves that are recoverable from additional wells yet to be
drilled. Undeveloped reserves are those considered proved for production by
reasonable geological interpretation of adequate subsurface control in
reservoirs that are producing or proved by other wells but are not recoverable
from existing wells. This classification of reserves requires drilling of
additional wells, major deepening of existing wells, or installation of enhanced
recovery or other facilities.

                                       8
<PAGE>
MESA Royalty Trust
March 20, 2000
Page 3


Helium reserves were classified using the same standards as those described in
the foregoing definitions of petroleum reserves. Since it is mixed in and
produced with the natural gas reserves, the term gas as used herein applies to
both gases, where appropriate, and the term natural gas is used to refer to
hydrocarbon gas.

Estimates of the net proved reserves attributable to the Trust, as of December
31, 1999, are as follows:

      TOTAL PROVED RESERVES:
           Natural Gas (Mcf)...............................16,358,790
           Helium (Mcf)........................................54,777
           Natural Gas Liquids (bbl)..........................902,212

      PROVED DEVELOPED RESERVES
           Natural Gas (Mcf)...............................16,358,790
           Helium (Mcf)........................................54,777
           Natural Gas Liquids (bbl)..........................902,212

Proved natural gas liquid reserves and helium reserves are included herein for
the Satanta plant, which was completed and placed on stream in the Hugoton field
in Kansas during late 1993.

Future oil and gas producing rates estimated for this report are based on
production rates considering the most recent figures available or, in certain
cases, are based on estimates. The rates used for future production are within
the capacity of the well or reservoir to produce.

Pioneer is continuing to upgrade the well gathering system, which improves
deliverability of the wells. This increase in deliverability and the associated
costs have been incorporated in the estimates included herein.

Gas volumes shown herein are expressed at standard conditions of 60 degrees
Fahrenheit and at 14.65 pounds per square inch absolute. Gross volumes are
reported as wet gas and the net volumes are reported as processed hydrocarbon
sales; however, neither the gross or net volumes were reduced for plant fuel
usage. The value of this fuel is deducted as part of the plant operating costs.

Revenue values in this report were estimated using current prices and costs.
Future prices were estimated using guidelines established by the Securities and
Exchange Commission and the Financial Accounting Standards Board.

The assumptions used for estimating future prices and costs are as follows:

      o   Natural Gas Prices - Gas prices were held constant for the life of the
          properties.

      o  Natural Gas Liquids and Helium Prices - Natural gas liquids and helium
         prices were held constant for the life of the properties.

      o  Operating and Capital Costs - Estimates of operating costs based on
         current costs were used for the life of the properties with no increase
         in the future based on inflation. Future capital expenditures were
         estimated using 1999 values and were not adjusted for inflation.




The estimated future net revenue, future net cashflow and present worth
discounted at 10% (percent) attributable to the Trust Interest for the life of
the Trust is as follows.

                                       9
<PAGE>
MESA Royalty Trust
March 20, 2000
Page 4


TRUST INTEREST:


            Future Net Revenue ($)(1) .....................79,073,961

            Future Lease Operating Expenses ($).............4,976,258

            Future Net Production Taxes ($) ................1,957,101

            Future Net Ad Valorem Taxes ($) ................4,711,840

            Future Capital Expenditures ($) ..................736,553

            Future Overhead ($) ...........................11,445,408

            Future Net Cashflow ($) .......................55,246,801

            Present Worth at 10 Percent ($)(1) ............25,899,463

    (1). Future income tax expenses were not taken into account in the
    preparation of these estimates. Approximately 2 percent of the
    present worth is estimated to come from helium sales.

In our opinion, the information relating to the estimated proved reserves,
estimated future net revenue from proved reserves, and present worth of
estimated future net revenue from proved reserves of natural gas liquids, and
gas contained in this report has been prepared in accordance with Paragraphs
10-13, 15 and 30(a)-(b) of Statement of Financial Accounting Standards No. 69
(November 1982) of the Financial Accounting Standards Board and Rules 4- 1
0(a)(1)-(13) of Regulation S-X and Rule 302(b) of Regulation S-K of the
Securities and Exchange Commission; provided, however, (I) future income tax
expenses have not been taken into account in estimating the future net revenue
and present worth values set forth herein and (II) minor amounts of revenue from
helium produced with the natural gas are included herein.

To the extent the above enumerated rules, regulations, and statements require
determinations of an accounting or legal nature or information beyond the scope
of this report, we are necessarily unable to express an opinion as to whether
the above-described information is in accordance therewith or sufficient
therefore.


Submitted,


/s/ JOHN PETERS

                                       10
<PAGE>
                                  CONOCO INC.
                                 LETTER REPORT
                                     DATED
                                 MARCH 24, 2000
                                       ON
                              RESERVES AND REVENUE
                                     AS OF
                               DECEMBER 31, 1999
                                      FROM
                               CERTAIN PROPERTIES
                                    OWNED BY
                               MESA ROYALTY TRUST

                                       11
<PAGE>
                              [CONOCO LETTERHEAD]


March 17, 2000

Mesa Royalty Trust
Chase Bank of Texas, N.A.
Suite 1150
600 Travis Street
Houston, Texas 77002

Re:   MESA ROYALTY TRUST RESERVES AS OF DECEMBER 31, 1999
      SAN JUAN BASIN PROPERTIES, NEW MEXICO

Gentlemen:

Pursuant to your request, estimates have been prepared as of December 31, 1999
of the extent and value of proved natural gas, condensate, and natural gas
liquid reserves of certain properties owned by the Mesa Royalty Trust,
hereinafter referred to as "MRT". The MRT interest appraised consists of a
10.29282 percent net royalty interest in certain San Juan Basin properties
administered by Conoco.

Reserves in this report are expressed as Conoco net reserves and MRT net
reserves. Conoco net reserves are defined as Conoco's net share of estimated
petroleum hydrocarbons remaining to be produced from the properties after
December 31, 1999. MRT net reserves are defined as that portion of the Conoco
net reserves attributable to the interest owned by MRT.

Values shown herein are expressed in terms of future revenue, future cash flow,
and present worth. Future revenue is that revenue which will accrue from
production and sale of the estimated net reserves. Future cash flow is
calculated by deducting estimated production and ad valorem taxes, operating and
transportation expenses, capital costs, and abandonment costs from the future
revenue. Federal income taxes are not taken into account in the preparation of
these estimates. Present worth is defined as future cash flow discounted at a
specified discount rate compounded monthly over the expected period of
realization. A discount rate of 10 percent is used in this report.

Reserves attributable to the MRT interest are calculated by allocating to MRT a
portion of the Conoco net reserves based on future cash flow. Because reserves
volumes are estimated using future cash flow, a change in prices or costs will
result in changes of reserves. Therefore, the MRT net reserves will vary if
different price and cost assumptions are used.

Petroleum reserves included in this report are classified as proved and judged
to be economically producible in future years from known reservoirs under
existing economic and operating conditions. Total proved reserves are the sum of
developed and undeveloped reserves. Proved developed reserves are those
recoverable from existing

                                       12
<PAGE>
1999 Mesa Royalty Trust Reserves
March 17, 2000


wells with current operating methods and expenses, and thus require little or no
capital expenditure to produce. Proved undeveloped reserves are those which
require major capital expenditures for new wells and/or facilities. Estimates of
the MRT net reserves and production as of December 31, 1999 are tabulated below
along with the MRT net reserves reported last year for comparison.

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------
  MRT NET PROVED
     RESERVES               CONVENTIONAL       FRUITLAND COAL          TOTAL
  SAN JUAN BASIN             RESERVOIRS          RESERVOIRS        ALL RESERVOIRS
   DEVELOPED +           ------------------  ------------------  ------------------
   UNDEVELOPED           12/31/98  12/31/99  12/31/98  12/31/99  12/31/98  12/31/99
- -----------------------------------------------------------------------------------

<S>                       <C>       <C>        <C>         <C>    <C>       <C>
- -----------------------------------------------------------------------------------
Natural Gas, MMscf ...    12,789    15,243     1,768       957    14,557    16,199
- -----------------------------------------------------------------------------------
Condensate, Mbbl .....        57        70         0         0        57        70
- -----------------------------------------------------------------------------------
Natural Gas Liquids,
Mbbl .................       821     1,000         0         0       821     1,000
- -----------------------------------------------------------------------------------


<CAPTION>
- -----------------------------------------------------------------------------------
  MRT NET PROVED
     RESERVES
  SAN JUAN BASIN            CONVENTIONAL       FRUITLAND COAL          TOTAL
     DEVELOPED               RESERVOIRS          RESERVOIRS        ALL RESERVOIRS
       ONLY              ------------------  ------------------  ------------------
                         12/31/98  12/31/99  12/31/98  12/31/99  12/31/98  12/31/99
- -----------------------------------------------------------------------------------

<S>                       <C>       <C>        <C>         <C>    <C>       <C>
- -----------------------------------------------------------------------------------
Natural Gas, MMscf ...    12,395    14,463     1,768       957    14,163    15,420
- -----------------------------------------------------------------------------------
Condensate, Mbbl .....        54        65         0         0        54        65
- -----------------------------------------------------------------------------------
Natural Gas Liquids,
Mbbl .................       796       949         0         0       796       949
- -----------------------------------------------------------------------------------
</TABLE>

Total MRT reserves increased in 1999 due to improvements in price. Proved
Developed Behind Pipe and Proved Undeveloped reserves increased in 1999 due to
an increased development plan. Many of the Proved Undeveloped Reserves will be
accessed in 2000 through an active development and re-completion program. The
reserves value reflect natural gas shrinkage of 13.08 percent for conventional
gas reservoirs due to processing and plant fuel use, and an average net back to
producing properties of 61 percent of recovered natural gas liquids. The
Fruitland Coal reservoir has dry gas (no natural gas liquids) and therefore is
not subject to shrinkage due to liquids extraction.

Product prices and operating costs used for year-end 1999 are shown in the table
below, along with those used last year for comparison. Separate gas prices were
used for Fruitland Coal and conventional gas due to the differences in
transportation and value. Prices and operating costs are held constant over the
life of the properties. The December 1999 product prices are substantially
higher than December 1998.

         -------------------------------------------------
         PRODUCT PRICES       DECEMBER 1998  DECEMBER 1999
         -------------------------------------------------
         Conventional Nat.
         Gas, $/Mscf              1.79          2.33
         -------------------------------------------------
         Coal Natural Gas,        1.79          1.98
         -------------------------------------------------
         Condensate, $/Bbl        9.79         21.54
         -------------------------------------------------
         Natural Gas
         Liquids, $/Bbl           8.39         12.01
         -------------------------------------------------

                                       13
<PAGE>
1999 Mesa Royalty Trust Reserves
March 17, 2000

Revenue and cash flow values in this report are based on product prices for San
Juan Basin effective on December 31, 1999. The gas price excludes a
transportation expense of $0.36 per Mcf for conventional gas and $0.74 per Mcf
for Fruitland Coal gas. The price also excludes combined production and ad
valorem tax rates of 10.9 percent and 9.5 percent of revenue for conventional
and Fruitland Coal gas, respectively. These taxes compare with the 1998 rates of
11.1 percent and 9.9 percent, respectively. The taxes and transportation
expenses are also excluded from the annual per well operating costs tabulated
below. Operating costs on a per well basis are comparable to 1998. Changes in
the numbers of Net Active Completions are due to the inclusion of Fruitland Coal
wells in the San Juan East and West Fields with other Conoco and partner
operated coal wells. The total number of Net Active Completions increased
slightly.

          -------------------------------------------------------------
           OPERATING             NET ACTIVE          OPERATING COSTS
             COSTS               COMPLETIONS          ($/WELL/YEAR)
                            --------------------   --------------------
                            12/31/98    12/31/99   12/31/98    12/31/99
          -------------------------------------------------------------
          Conventional
          Gas ........         431         417      17,100      17,000
          -------------------------------------------------------------
          Fruitland
          Coal Gas ...          14          35      49,700      48,800
          -------------------------------------------------------------

A summary of estimated future revenue, taxes, costs, cash flow, and present
worth attributable to CONOCO'S net reserves as of December 31, 1999 is shown in
the table below, along with what was reported last year for comparison. All
costs are year-end 1999 estimates and are not adjusted for inflation. Cash flow
and present worth are reported on a before federal income tax (BFIT) basis.

- --------------------------------------------------------------------------------
CONOCO NET INTEREST     CONVENTIONAL        FRUITLAND COAL         TOTAL
  SAN JUAN BASIN         RESERVOIRS           RESERVOIRS       ALL RESERVOIRS
- --------------------------------------------------------------------------------
                     12/31/98  12/31/99  12/31/98  12/31/99  12/31/98  12/31/99
- --------------------------------------------------------------------------------
Future Revenue, M$    576,865   765,131    57,922    58,871   634,787   824,002
- --------------------------------------------------------------------------------
Production & Ad
Valorem Taxes, M$ .    64,032    83,399     5,734     5,605    69,766    89,004
- --------------------------------------------------------------------------------
Operating &
Transportation Costs
M$ ................   207,254   185,874    20,429    33,670   227,683   219,544
- --------------------------------------------------------------------------------
Abandonment Costs,
M$ ................     1,594     1,742        53       127     1,647     1,869
- --------------------------------------------------------------------------------
Capital Costs, M$ .     9,258    17,836       956     1,055    10,214    18,891
- --------------------------------------------------------------------------------
Future BFIT Cash
Flows M$...........   294,727   476,280    30,750    18,414   325,477   494,694
- --------------------------------------------------------------------------------
Deficit Balance, M$         0         0         0         0         0         0
- --------------------------------------------------------------------------------
Future BFIT Cash
Flow Subject to
MRT Interest, M$ ..   294,727   476,280    30,750    18,414   325,477   494,694
- --------------------------------------------------------------------------------
Present Worth
@10%, M$ ..........   105,359   187,405    24,653    14,640   130,012   202,045
- --------------------------------------------------------------------------------

Conoco's future revenues are significantly higher due to the increased product
prices.

The total operating costs are lower than 1998 due to the lower transportation
cost for conventional gas. The total Fruitland Coal operating costs, however,
are higher as a result of the increased transportation cost and the reallocated
completion count.

Capital costs are associated with projects required to produce undeveloped
proved reserves and maintain existing production of developed reserves. The
increase in

                                       14
<PAGE>
1999 Mesa Royalty Trust Reserves
March 17, 2000


capital for the conventional reservoirs reflects the additional wells needed to
develop the increased proved undeveloped reserves.

A summary of estimated future cash flow and present worth attributable to the
MRT interest as of December 31, 1999 is tabulated below along with what was
reported last year for comparison.

- --------------------------------------------------------------------------
  MRT INTEREST      CONVENTIONAL         FRUITLAND            TOTAL
   (10.29282%)       RESERVOIRS       COAL RESERVOIRS     ALL RESERVOIRS
                 -----------------   -----------------   ----------------
 SAN JUAN BASIN  12/31/98 12/31/99   12/31/98 12/31/99   12/31/98 12/31/99
- --------------------------------------------------------------------------
Future BFIT Cash
Flow, M$ .......   30,336   49,023      3,165    1,895     33,501   50,918
- --------------------------------------------------------------------------
Present Worth
@10%, M$ .......   10,844   19,289      2,537    1,507     13,381   20,796
- --------------------------------------------------------------------------

Compared to last year, future cash flow and present worth for conventional gas
is higher, reflecting the increase in product prices. The Fruitland Coal cash
flow and present worth are lower because of the increased number of completions
and the higher transportation cost.

The information relating to estimated proved reserves (natural gas, condensate,
natural gas liquids), estimated future revenue from proved reserves, and present
worth of cash flow contained in this report has been prepared in accordance with
regulations of the Financial Accounting Standards Board and Securities and
Exchange Commission.


Sincerely,


/s/ RANDALL DARR
    Randall Darr

                                       15
<PAGE>
     There are numerous uncertainties inherent in estimating quantities of
proved reserves and in projecting the future rates of production and timing of
development expenditures, including many factors beyond the control of the
producer. The preceding reserve data in the Reserve Reports represent estimates
only and should not be construed as being exact. Reserve assessment is a
subjective process of estimating the recovery from underground accumulations of
gas and oil that cannot be measured in an exact way, and estimates of other
persons might differ materially from those of PNR and Conoco. Accordingly,
reserve estimates are often different from the quantities of hydrocarbons that
are ultimately recovered.

     While estimates of reserves attributable to the Royalty are shown in order
to comply with requirements of the SEC, there is no precise method of allocating
estimates of physical quantities of reserves between the working interest owners
and the Trust, since the Royalty is not a working interest and the Trust does
not own and is not entitled to receive any specific volume of reserves from the
Royalty. Reserve quantities in the previously mentioned reserve studies have
been allocated based on the method referenced in the Reserve Reports. The
quantities of reserves attributable to the Trust will be affected by future
changes in various economic factors utilized in estimating future gross and net
revenues from the Royalty Properties. Therefore, the estimates of reserves set
forth in the Reserve Reports are to a large extent hypothetical and differ in
significant respects from estimates of reserves attributable to a working
interest.

     Moreover, the discounted present values in the Reserve Reports should not
be construed as the current market value of the estimated gas and oil reserves
attributable to the Royalty Properties or the costs that would be incurred to
obtain equivalent reserves, since a market value determination would include
many additional factors. In accordance with applicable regulations of the SEC,
estimated future net revenues were based, generally, on current prices and
costs, whereas actual future prices and costs may be materially greater or less.
The estimates in the Reserve Reports use market prices as of the end of the
year. These prices (having a weighted average of $2.20 per Mcf for Hugoton
properties and $2.31 per Mcf for San Juan Basin properties as of December 31,
1999) were held constant over the estimated life of the Royalty Properties. Such
prices were influenced by seasonal demand for natural gas and may not be the
most appropriate or representative prices to use for estimating future revenues
or related reserve data. The average price of natural gas from the Royalty
Properties during 1999 was $1.90 per Mcf, representing a combination of contract
prices and spot market prices.

     The future net revenues shown by the Reserve Reports have not been reduced
for costs and expenses of the Trust, which are expected to approximate $55,000
annually. The costs and expenses of the Trust may increase in future years,
depending on the amount of Royalty income, increases in accounting, engineering,
legal and other professional fees and other factors.

     The working interest owners have advised the Trustee that there have been
no events subsequent to December 31, 1999 that have caused a significant change
in the estimated proved reserves referred to in the Reserve Reports.

INCOME, PRODUCTION AND AVERAGE PRICES

     Reference is made to "Summary of Royalty Income, Production and Average
Prices" under Item 7 of this Form 10-K for information concerning income,
production and prices with respect to the Royalty.

ASSETS

     Reference is made to Item 6 of this Form 10-K for information concerning
the Trust's assets.

                                       16
<PAGE>
                                   CONTRACTS

HUGOTON FIELD

     Natural gas and natural gas liquids produced by PNR from the Hugoton field
and attributable to the Royalty accounted for approximately 62% of the Royalty
income of the Trust during 1999.

     PNR has advised the Trust that since June 1, 1995 natural gas produced from
the Hugoton field has generally been sold under short-term and multi-month
contracts at market clearing prices to multiple purchasers including Williams
Energy Supply ("WESCO"), Oneok Gas Marketing, Inc., Amoco Production Company
and Anadarko Energy Services, Inc. PNR has advised the Trust that it expects to
continue to market gas production from the Hugoton field under short-term and
multi-month contracts. Overall market prices received for natural gas from the
Hugoton Royalty Properties were lower in 1999 compared to 1998.

     In June 1994, PNR entered into a gas transportation agreement (the "Gas
Transportation Agreement") with Western Resources, Inc. ("WRI") for a primary
term of five years commencing June 1, 1995 and ending June 1, 2000, but which
may be continued in effect year-to-year thereafter. Pursuant to the Gas
Transportation Agreement, WRI agreed to compress and transport up to 160 MMcf
per day of gas and redeliver such gas to PNR at the inlet of PNR's Satanta
Plant. PNR agreed to pay WRI a fee of $0.06 per Mcf escalating 4% annually as of
June 1, 1996. This Gas Transportation Agreement was assigned to Midcontinent
Market Center.

     Allowable rates of production in the Hugoton field are set by the KCC based
on the level of market demand. The Hugoton field allowable for the period
October 1, 1999 through March 31, 2000, was 179.6 billion cubic feet of gas,
compared with 251 billion cubic feet of gas during the same period last year.

SAN JUAN BASIN

     Natural gas produced from the San Juan Basin field and attributable to the
Royalty accounted for approximately 38% of the Royalty income of the Trust
during 1999. The majority of gas produced from the San Juan Basin is now being
sold on the spot market.

MARKET FOR NATURAL GAS

     The amount of cash distributions by the Trust is dependent on, among other
things, the sales prices for natural gas produced from the Royalty Properties
and the quantities of gas sold. The natural gas industry in the United States
during the past decade has been affected generally by a surplus in natural gas
deliverability compared to demand. Demand for gas declined during this period
due to a number of factors including the implementation of energy conservation
programs, a shift in economic activity away from energy intensive industries and
competition from alternative fuel sources such as residual fuel oil, coal and
nuclear energy. The surplus of natural gas deliverability caused a significant
deterioration in gas prices. The annual average wellhead price for natural gas
peaked in 1984 at $2.66 per Mcf and declined to $1.55 in 1995. Annual wellhead
prices generally increased to $2.32 per Mcf in 1997, decreased to $1.94 per Mcf
in 1998 and increased to an estimated $2.04 per Mcf in 1999, according to
Natural Gas Monthly published by the Energy Information Administration of the
Department of Energy. Spot prices for domestic natural gas were negatively
affected by warmer than normal weather in the winters of 1998-99 and 1999-2000.

     Due to the seasonal nature of demand for natural gas and its effects on
sales prices and production volumes, the amounts of cash distributions by the
Trust may vary substantially on a seasonal basis. Generally, production volumes
and prices are higher during the first and fourth quarters of each calendar year
due primarily to peak demand in these periods. Because of the time lag between
the date on which the working interest owners receive payment for production
from the Royalty Properties and the date on which distributions are made to
unitholders, the seasonality that generally affects production volumes and
prices is generally reflected in distributions to unitholders in later periods.

                                       17
<PAGE>
COMPETITION

     The production and sale of gas in the Hugoton field and San Juan Basin
areas is highly competitive, and the working interest owners' competitors in
these areas include the major oil and gas companies, independent oil and gas
concerns, and individual producers and operators. There are numerous producers
in the Hugoton field and the San Juan Basin areas. The working interest owners
have advised the Trust that they believe that their competitive position in
their respective areas is affected by price, contract terms and quality of
service. PNR has also advised the Trust that it believes that its competitive
position in the Hugoton field is enhanced by virtue of its substantial holdings
and ownership and control of its wells, gathering systems and processing plant.
Market conditions in the San Juan Basin are negatively affected by the fact that
most of the gas produced from such areas is transported on one of only two major
pipelines, and the transportation of such gas is generally controlled by a small
number of distribution companies.

                             REGULATION AND PRICES

GENERAL

     The production and sale of natural gas from the Royalty Properties are
affected from time to time in varying degrees by political developments and
federal, state and local laws and regulations. In particular, oil and gas
production operations and economics are, or in the past have been, affected by
price controls, taxes, conservation, safety, environmental and other laws
relating to the petroleum industry, by changes in such laws and by constantly
changing administrative regulations.

FERC REGULATION

     In recent years, the FERC has required interstate pipeline companies to
"unbundle" their services. To the extent a pipeline company or its sales
affiliate makes gas sales as a merchant in the future, it does so pursuant to
private contracts in direct competition with all other sellers, such as the
working interest owners. In recent years, the FERC also has pursued a number of
other policy initiatives which could significantly affect the marketing of
natural gas. Several of these initiatives are intended to enhance competition in
natural gas markets, although some, such as "spindowns" of gathering assets,
may have the adverse effect of increasing the cost of doing business on some in
the industry. In 1996, the FERC issued a Statement of Policy regarding its
jurisdiction under the NGA and OCSLA over new natural gas facilities and
services on the OCS. Generally, the FERC retained its existing tests for
determining the jurisdictional status of offshore facilities, but eased the
application of its jurisdiction over facilities in water depths of 200 meters or
more. On February 9, 2000, the FERC issued Order No. 637, which permits, and in
some cases requires, interstate natural gas pipelines to make certain changes to
the nature of interstate transportation services. In addition to the changes
implemented through Order No. 637, the FERC has stated that it will institute a
review of its regulatory model in light of the changes in the natural gas
industry. Requests for rehearing of Order No. 637 are pending before the FERC.
Once the FERC has addressed the rehearing requests, the order may be subject to
judicial review. As to all of these recent FERC initiatives, the working
interest owners have advised the Trust that the on-going, or, in some instances,
preliminary evolving nature of these regulatory initiatives makes it impossible
at this time to predict their ultimate impact on the prices, markets or terms of
sale of natural gas related to the Trust.

STATE AND OTHER REGULATION

     All of the jurisdictions in which the Trust has an interest in producing
oil and gas properties have statutory provisions regulating the production and
sale of crude oil and natural gas. The regulations often require permits for the
drilling of wells but extend also to the spacing of wells, the prevention of
waste of oil and gas resources, the rate of production, prevention and clean-up
of pollution and other matters. See "Contracts -- Hugoton Field" for a
discussion of PNR's allowables in the Hugoton Royalty Properties.

                                       18
<PAGE>
     State regulation of gathering facilities generally includes various safety,
environmental, and in some circumstances, non-discriminatory take requirements.
For example, Oklahoma and Kansas have enacted a prohibition against
discriminatory gathering rates. In addition, certain Texas regulatory officials
have expressed interest in evaluating similar rules, but to date no actions have
been taken towards regulatory gathering rates in the state.

ENVIRONMENTAL MATTERS

     The working interest owners' operations are subject to numerous federal,
state and local laws and regulations controlling the discharge of materials into
the environment or otherwise relating to the protection of the environment,
including the Comprehensive Environmental Response, Compensation and Liability
Act ("CERCLA" or "Superfund"), the Solid Waste Disposal Act, the Clean Air
Act, and the Federal Water Pollution Control Act. These laws and regulations,
including their state counterparts, can impose liability upon the lessee under a
lease for the cost of cleanup of discharged materials resulting from a lessee's
operations or can subject the lessee to liability for damages to natural
resources. Violations of environmental laws, regulations, or permits can result
in civil and criminal penalties as well as potential injunctions curtailing
operations in affected areas and restrictions on the injection of liquids into
the subsurface that may contaminate groundwater. The working interest owners
have advised the Trust that they maintain insurance for costs of cleanup
operations, but they are not fully insured against all such risks. A serious
release of regulated materials could result in the DOI requiring lessees under
federal leases to suspend or cease operations in the affected area. In addition,
the recent trend toward stricter standards and regulations in environmental
legislation is likely to continue. For example, from time to time legislation
has been proposed in Congress that would reclassify certain oil and gas
production wastes as "hazardous wastes" which would subject the handling,
disposal and cleanup of these wastes to more stringent requirements and result
in increased operating costs for the Royalty Properties, as well as the oil and
gas industry in general. State initiatives to further regulate the disposal of
oil and gas wastes are also pending in certain states, and these initiatives
could have a similar impact on the Royalty Properties.

     The working interest owners have advised the Trust that they are not
involved in any administrative or judicial proceedings relating to the Royalty
Properties arising under federal, state or local environmental protection laws
and regulations or which would have a material adverse effect on the working
interest owners' financial position or results of operations.

ITEM 2.  PROPERTIES.

     Reference is made to Item 1 of this Form 10-K.

ITEM 3.  LEGAL PROCEEDINGS.

     There are no pending legal proceedings to which the Trust is a party.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

     There were no matters submitted to a vote of security holders during the
fourth quarter of 1999.

                                       19
<PAGE>
                                    PART II

ITEM 5.  MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED UNITHOLDER
MATTERS.

     The units of beneficial interest of the Trust are traded on the New York
Stock Exchange -- ticker symbol "MTR". The high and low sales prices and
distributions per unit for each quarter in the two years ended December 31,
1999, were as follows:

<TABLE>
<CAPTION>
                                               1999                                  1998
                                -----------------------------------   -----------------------------------
QUARTER                           HIGH        LOW      DISTRIBUTION     HIGH        LOW      DISTRIBUTION
- ------------------------------  ---------  ---------   ------------   ---------  ---------   ------------
<S>                             <C>        <C>         <C>            <C>        <C>         <C>
First.........................  $   44.88  $   43.00      $.6503      $   45.69  $   44.00     $ 1.1749
Second........................  $   46.50  $   43.25      $.6478      $   45.88  $   43.88     $  .8763
Third.........................  $   49.00  $   45.00      $.7513      $   45.38  $   44.13     $  .7580
Fourth........................  $   48.25  $   47.00      $.9043      $   45.75  $   43.25     $  .5436
</TABLE>

     At March 26, 1999, the 1,863,590 units outstanding were held by 1,501
unitholders of record.

ITEM 6.  SELECTED FINANCIAL DATA.

<TABLE>
<CAPTION>
                                            1999            1998            1997            1996            1995
                                       --------------  --------------  --------------  --------------  --------------
<S>                                    <C>             <C>             <C>             <C>             <C>
Royalty income.......................  $    5,475,497  $    6,209,778  $    9,287,406  $    7,669,020  $    5,941,088
Distributable income.................  $    5,504,362  $    6,248,216  $    9,358,576  $    7,689,372  $    5,957,482
Distributable income per unit........  $       2.9536  $       3.3528  $       5.0218  $       4.1261  $       3.1967
Total assets at year end.............  $   14,358,414  $   14,902,521  $   17,616,866  $   18,975,935  $   20,715,506
</TABLE>

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS.

LIQUIDITY AND CAPITAL RESOURCES

     As discussed under "Description of the Trust" in Item 1 of this Form
10-K, the Trust's source of cash is the Royalty income received from its share
of the net proceeds from the Royalty Properties. Reference is made to Note 6 in
the Notes to Financial Statements under Item 8 of this Form 10-K for estimates
of future Royalty income attributable to the Royalty.

     In accordance with the provisions of the Conveyance, generally all revenues
received by the Trust, net of Trust administrative expenses and the amount of
established reserves, are distributed currently to the unitholders.

FINANCIAL REVIEW

  YEARS 1999 AND 1998

     The Trust's Royalty income was $5,475,497 in 1999, a decrease of
approximately 12%, as compared to $6,209,778 in 1998, primarily as a result of
lower natural gas production and natural gas prices.

     Royalty income from the Hugoton Royalty Properties was $3,400,082 in 1999,
a decrease of approximately 20%, as compared to $4,235,415 in 1998, as a result
of both decreased natural gas and natural gas liquids prices and production.

     The average price received for natural gas and natural gas liquids from the
Hugoton Royalty Properties was $1.97 per Mcf and $10.24 per barrel,
respectively, in 1999 as compared to $2.10 per Mcf and $10.64 per barrel,
respectively, in 1998. Net production attributable to the Hugoton Royalty was
1,250,300 Mcf of natural gas and 91,503 barrels of natural gas liquids in 1999
as compared with 1,539,202 Mcf of natural gas and 94,275 barrels of natural gas
liquids in 1998.

     Royalty income from the San Juan Basin Royalty Properties located in the
state of New Mexico was $2,075,415 in 1999 as compared to $1,974,363 in 1998 due
primarily to an increase in natural gas

                                       20
<PAGE>
and natural gas liquids production as well as an increase in natural gas liquid
prices. No Royalty income was received from Amoco with respect to the San Juan
Basin Royalty Properties located in the state of Colorado in 1999 or 1998 as
costs associated with the development drilling program from Royalty Properties
in that state have not been fully recovered.

     The average price received for natural gas and natural gas liquids, oil and
condensate from the San Juan Basin Royalty Properties was $1.81 per Mcf and
$12.54 per barrel, respectively, in 1999 compared with $1.92 per Mcf and $11.12
per barrel, respectively, in 1998. Net production attributable to the San Juan
Basin Royalty was 865,312 Mcf of natural gas and 40,606 barrels of natural gas
liquids, oil and condensate in 1999 as compared to 811,007 Mcf of natural gas
and 37,521 barrels of natural gas liquids, oil and condensate in 1998.

     As more fully discussed in Note 6 of the Notes to Financial Statements
contained in Item 8 of this Form 10-K, production attributable to the Trust's
interest in the Royalty Properties is calculated based on Royalty income
received from the applicable net profits interest owned by the Trust.

     Conoco has informed the Trust that it believes the production from the
Fruitland Coal formation will generally qualify for the tax credits provided
under Section 29 of the Code. See "Description of the Units -- Federal Income
Tax Matters -- Section 29 Credit" under Item 1 of this Form 10-K.

  YEARS 1998 AND 1997

     The Trust's Royalty income was $6,209,778 in 1998, a decrease of
approximately 33%, as compared to $9,287,406 in 1997, primarily as a result of
lower natural gas production and natural gas and natural gas liquids prices.

     Royalty income from the Hugoton Royalty Properties was $4,235,415 in 1998,
a decrease of approximately 30%, as compared to $6,011,781 in 1997, primarily as
a result of lower natural gas and natural gas liquids prices in 1998.

     The average price received for natural gas and natural gas liquids from the
Hugoton Royalty Properties was $2.10 per Mcf and $10.64 per barrel,
respectively, in 1998 as compared to $2.43 per Mcf and $15.27 per barrel,
respectively, in 1997. Net production attributable to the Hugoton Royalty was
1,539,202 Mcf of natural gas and 94,275 barrels of natural gas liquids in 1998
as compared with 1,682,623 Mcf of natural gas and 125,934 barrels of natural gas
liquids in 1997.

     Royalty income from the San Juan Basin Royalty Properties is calculated and
paid to the Trust on a state-by-state basis. Royalty income from the San Juan
Basin Royalty Properties located in the state of New Mexico was $1,974,363 in
1998 as compared to $3,275,625 in 1997. The decrease in Royalty income was due
primarily to decreased natural gas and natural gas liquids prices in 1998. No
Royalty income was received from Amoco with respect to the San Juan Basin
Royalty Properties located in the state of Colorado in 1998 or 1997, as costs
associated with the Fruitland Coal drilling program on Royalty Properties in
that state have not been fully recovered. The San Juan Basin development
drilling program has no effect on Royalty income or distributions relating to
the Hugoton Royalty.

     The average price received for natural gas and natural gas liquids, oil and
condensate from the San Juan Basin Royalty Properties was $1.92 per Mcf and
$11.12 per barrel, respectively, in 1998 compared with $2.21 per Mcf and $15.88
per barrel, respectively, in 1997. Net production attributable to the San Juan
Basin Royalty was 811,007 Mcf of natural gas and 37,521 barrels of natural gas
liquids, oil and condensate in 1998 as compared to 1,203,514 Mcf of natural gas
and 38,782 barrels of natural gas liquids, oil and condensate in 1997.

                                       21

<PAGE>
      SUMMARY OF ROYALTY INCOME, PRODUCTION AND AVERAGE PRICES (UNAUDITED)
<TABLE>
<CAPTION>
                                                                                   SAN JUAN BASIN               TOTAL
                                                       HUGOTON             ------------------------------    -----------
                                              -------------------------                        OIL,
                                                              NATURAL                       CONDENSATE
                                                                GAS                         AND NATURAL
                                              NATURAL GAS    LIQUIDS(2)    NATURAL GAS    GAS LIQUIDS(2)     NATURAL GAS
<S>                                           <C>            <C>           <C>            <C>                <C>
Year ended December 31, 1999:
  The Trust's proportionate share of --
    Gross proceeds..........................   $3,382,152    $  936,991     $3,119,929       $ 683,584       $6,502,081
  Less the Trust's proportionate share of --
    Capital costs recovered(1)..............     (32,956)        --           (83,475)         --              (116,431)
    Operating costs.........................    (886,105)        --        (1,434,069)        (174,383)      (2,320,174)
    Interest on cost carryforward...........      --             --           (36,171)         --               (36,171)
                                              -----------    ----------    -----------    ---------------    -----------
  Royalty income............................   $2,463,091    $  936,991     $1,566,214       $ 509,201       $4,029,305
                                              ===========    ==========    ===========    ===============    ===========
  Average sales price.......................   $    1.97     $    10.24     $    1.81        $   12.54       $     1.90
                                              ===========    ==========    ===========    ===============    ===========
  Net production volumes attributable            (Mcf)         (Bbls)         (Mcf)           (Bbls)            (Mcf)
    to the Royalty paid.....................   1,250,300         91,503       865,312           40,606        2,115,612
                                              ===========    ==========    ===========    ===============    ===========
Year ended December 31, 1998:
  The Trust's proportionate share of --
    Gross proceeds..........................   $4,315,417    $1,003,090     $3,838,538       $ 594,315       $8,153,955
  Less the Trust's proportionate share of --
    Capital costs recovered(1)..............     (76,949)        --          (546,352)         --              (623,301)
    Operating costs.........................  (1,006,143)                  (1,699,546)        (177,086)      (2,705,689)
    Interest on cost carryforward...........      --             --           (35,506)         --               (35,506)
                                              -----------    ----------    -----------    ---------------    -----------
  Royalty income............................   $3,232,325    $1,003,090     $1,557,134       $ 417,229       $4,789,459
                                              ===========    ==========    ===========    ===============    ===========
  Average sales price.......................   $    2.10     $    10.64     $    1.92        $   11.12       $     2.04
                                              ===========    ==========    ===========    ===============    ===========
  Net production volumes attributable            (Mcf)         (Bbls)         (Mcf)           (Bbls)            (Mcf)
   to the Royalty paid......................   1,539,202         94,275       811,007           37,521        2,350,209
                                              ===========    ==========    ===========    ===============    ===========
Year ended December 31, 1997:
  The Trust's proportionate share of --
    Gross proceeds..........................   $5,432,474    $1,930,719     $5,041,640       $ 795,807       $10,474,114
  Less the Trust's proportionate share of --
    Capital costs recovered(1)..............     (90,316)        --          (316,032)         --              (406,348)
    Operating costs.........................  (1,253,384)        (7,712)   (2,028,792)        (179,948)      (3,282,176)
    Interest on cost carryforward...........      --             --           (37,050)         --               (37,050)
                                              -----------    ----------    -----------    ---------------    -----------
  Royalty income............................   $4,088,774    $1,923,007     $2,659,766       $ 615,859       $6,748,540
                                              ===========    ==========    ===========    ===============    ===========
  Average sales price.......................   $    2.43     $    15.27     $    2.21        $   15.88       $     2.34
                                              ===========    ==========    ===========    ===============    ===========
  Net production volumes attributable            (Mcf)         (Bbls)         (Mcf)           (Bbls)            (Mcf)
   to the Royalty paid......................   1,682,623        125,934     1,203,514           38,782        2,886,137
                                              ===========    ==========    ===========    ===============    ===========

<CAPTION>

                                                   OIL,
                                                CONDENSATE
                                                AND NATURAL
                                              GAS LIQUIDS(2)
<S>                                            <C>
Year ended December 31, 1999:
  The Trust's proportionate share of --
    Gross proceeds..........................     $1,620,575
  Less the Trust's proportionate share of --
    Capital costs recovered(1)..............       --
    Operating costs.........................      (174,383)
    Interest on cost carryforward...........       --
                                              ---------------
  Royalty income............................     $1,446,192
                                              ===============
  Average sales price.......................     $   10.95
                                              ===============
  Net production volumes attributable             (Bbls)
    to the Royalty paid.....................       132,109
                                              ===============
Year ended December 31, 1998:
  The Trust's proportionate share of --
    Gross proceeds..........................     $1,597,405
  Less the Trust's proportionate share of --
    Capital costs recovered(1)..............       --
    Operating costs.........................      (177,086)
    Interest on cost carryforward...........       --
                                              ---------------
  Royalty income............................     $1,420,319
                                              ===============
  Average sales price.......................     $   10.78
                                              ===============
  Net production volumes attributable             (Bbls)
   to the Royalty paid......................       131,796
                                              ===============
Year ended December 31, 1997:
  The Trust's proportionate share of --
    Gross proceeds..........................     $2,726,526
  Less the Trust's proportionate share of --
    Capital costs recovered(1)..............       --
    Operating costs.........................      (187,660)
    Interest on cost carryforward...........       --
                                              ---------------
  Royalty income............................     $2,538,866
                                              ===============
  Average sales price.......................     $   15.41
                                              ===============
  Net production volumes attributable             (Bbls)
   to the Royalty paid......................       164,716
                                              ===============
</TABLE>

     For a discussion of the method used to compute the net production volumes
in the table above, see Note 6 in the Notes to Financial Statements.
- ------------

(1) Capital costs recovered represents capital costs incurred during the current
    or prior periods to the extent that such costs have been recovered by the
    applicable working interest owners from current period gross proceeds. Cost
    carryforward represents capital costs incurred during the current or prior
    periods which will be recovered from future period gross proceeds. The cost
    carryforward resulting from the Fruitland Coal drilling program was
    $452,188, $456,377 and $475,335 at December 31, 1999, 1998 and 1997,
    respectively, and relate solely to the San Juan Basin Colorado properties.
    See "Description of Royalty Properties -- San Juan Basin Fruitland Coal
    Drilling" for additional information regarding the Fruitland Coal drilling
    program.

(2) Gross proceeds attributable to natural gas liquids for the Hugoton and San
    Juan Basin properties are net of a volumetric in-kind processing fee
    retained by PNR and Conoco, respectively.

                                       22
<PAGE>
ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.

                               MESA ROYALTY TRUST

                       STATEMENTS OF DISTRIBUTABLE INCOME

<TABLE>
<CAPTION>
                                                                            YEARS ENDED DECEMBER 31,
                                                              ----------------------------------------------------
                                                                    1999              1998              1997
                                                              ----------------  ----------------  ----------------
Royalty income..............................................  $      5,475,497  $      6,209,778  $      9,287,406
<S>                                                           <C>               <C>               <C>
Interest income.............................................            54,911            73,714           109,948
General and administrative expenses.........................           (26,046)          (35,276)          (38,778)
                                                              ----------------  ----------------  ----------------
Distributable income........................................  $      5,504,362  $      6,248,216  $      9,358,576
                                                              ================  ================  ================
Distributable income per unit...............................  $         2.9536  $         3.3528  $         5.0218
                                                              ================  ================  ================
</TABLE>

               STATEMENTS OF ASSETS, LIABILITIES AND TRUST CORPUS

<TABLE>
<CAPTION>
                                                                                           DECEMBER 31,
                                                                                ----------------------------------
                                                                                      1999              1998
                                                                                ----------------  ----------------
<S>                                                                             <C>               <C>
                                    ASSETS
Cash and short-term investments...............................................  $      1,678,624  $      1,002,130
Interest receivable...........................................................             6,528            10,836
Net overriding royalty interests in oil and gas properties....................        42,498,034        42,498,034
     Less: accumulated amortization...........................................       (29,824,772)      (28,608,479)
                                                                                ----------------  ----------------
Total assets..................................................................        14,358,414  $     14,902,521
                                                                                ================  ================
                         LIABILITIES AND TRUST CORPUS
Distributions payable.........................................................  $      1,685,152  $      1,012,966
Trust corpus (1,863,590 units of beneficial
  interest authorized and outstanding)........................................        12,673,262        13,889,555
                                                                                ----------------  ----------------
Total liabilities and trust corpus............................................  $     14,358,414  $     14,902,521
                                                                                ================  ================
</TABLE>

                     STATEMENTS OF CHANGES IN TRUST CORPUS

<TABLE>
<CAPTION>
                                                                            YEARS ENDED DECEMBER 31,
                                                              ----------------------------------------------------
                                                                    1999              1998              1997
                                                              ----------------  ----------------  ----------------
Trust corpus, beginning of year.............................  $     13,889,555  $     15,512,726  $     17,414,537
<S>                                                           <C>               <C>               <C>
     Distributable income...................................         5,504,362         6,248,216         9,358,576
     Distributions to unitholders...........................        (5,504,362)       (6,248,216)       (9,358,576)
     Amortization of net overriding royalty interests.......        (1,216,293)       (1,623,171)       (1,901,811)
                                                              ----------------  ----------------  ----------------
Trust corpus, end of year...................................  $     12,673,262  $     13,889,555  $     15,512,726
                                                              ================  ================  ================
</TABLE>

   The accompanying notes are an integral part of these financial statements.

                                       23
<PAGE>
                               MESA ROYALTY TRUST
                         NOTES TO FINANCIAL STATEMENTS

(1) TRUST ORGANIZATION AND PROVISIONS

     The Mesa Royalty Trust (the "Trust") was created on November 1, 1979. On
that date, Mesa Petroleum Co., predecessor to Mesa Limited Partnership ("MLP")
which was the predecessor to MESA Inc., conveyed to the Trust a 90% net
overriding royalty interest (the "Royalty") in certain producing oil and gas
properties located in the Hugoton field of Kansas, the San Juan Basin field of
New Mexico and Colorado and the Yellow Creek field of Wyoming (the "Royalty
Properties"). On April 30, 1991, MLP sold its interests in the Royalty
Properties located in San Juan Basin field to Conoco Inc. ("Conoco"). Conoco
sold the portion of its interests in the San Juan Basin Royalty Properties
located in Colorado to MarkWest Energy Partners, Ltd. (effective January 1,
1993) and Red Willow Production Company (effective April 1, 1992). On October
26, 1994, MarkWest Energy Partners, Ltd. sold substantially all of its interest
in the Colorado San Juan Basin Royalty Properties to Amoco Production Company
("Amoco"), a subsidiary of BP Amoco. Until August 7, 1997, MESA Inc. operated
the Hugoton Royalty Properties through Mesa Operating Co., a wholly owned
subsidiary of MESA Inc. On August 7, 1997, MESA Inc. merged with and into
Pioneer Natural Resources Company ("Pioneer"), formerly a wholly owned
subsidiary of MESA. Inc., and Parker & Parsley Petroleum Company merged with and
into Pioneer Natural Resources USA, Inc. (successor to Mesa Operating Co.), a
wholly owned subsidiary of Pioneer ("PNR") (collectively, the mergers are
referred to herein as the "Merger"). Subsequent to the Merger, the Hugoton
Royalty Properties have been operated by PNR. The San Juan Basin Royalty
Properties located in New Mexico are operated by Conoco. The San Juan Basin
Royalty Properties located in Colorado are operated by Amoco. As used in this
report, PNR refers to the operator of the Hugoton Royalty Properties, Conoco
refers to the operator of the San Juan Basin Royalty Properties, other than the
portion of such properties located in Colorado, and Amoco refers to the operator
of the Colorado San Juan Basin Royalty Properties unless otherwise indicated.

     Chase Bank of Texas, National Association (the "Trustee") is trustee for
the Trust. The terms of the Mesa Royalty Trust Indenture (the "Trust
Indenture") provide, among other things, that:

        (a) the Trust cannot engage in any business or investment activity or
        purchase any assets;

        (b) the Royalty can be sold in part or in total for cash upon approval
        of the unitholders;

        (c) the Trustee can establish cash reserves and borrow funds to pay
        liabilities of the Trust and can pledge the assets of the Trust to
        secure payment of the borrowings;

        (d) the Trustee will make cash distributions to the unitholders in
        January, April, July and October each year as discussed more fully in
        Note 4;

        (e) the Trust will terminate upon the first to occur of the following
        events: (i) at such time as the Trust's royalty income for each of two
        successive years is less than $250,000 per year or (ii) a vote by the
        unitholders in favor of termination. Upon termination of the Trust, the
        Trustee will sell for cash all the assets held in the Trust estate and
        make a final distribution to unitholders of any funds remaining after
        all Trust liabilities have been satisfied; and

        (f) PNR, Conoco and Amoco (collectively the "Working Interest
        Owners") will reimburse the Trust for 59.34%, 27.45% and 1.77%,
        respectively, for general and administrative expenses of the Trust.

(2) NET OVERRIDING ROYALTY INTEREST

     In accordance with the instruments conveying the Royalty, the Working
Interest Owners will calculate and pay the Trust each month an amount equal to
90% of the net proceeds for the preceding month. The Trust Indenture was amended
in 1985, the effect of which was an overall reduction of approximately 88.56% in
the size of the Trust; therefore, the Trust is now entitled to receive 90% of
11.44% of the net proceeds for the preceding month. Generally, net proceeds
means the excess of the amounts received by the Working Interest Owners from
sales of oil and gas from the Royalty Properties over the operating and capital
costs incurred.

     The initial carrying value of the Royalty represented the net book value
assigned by PNR to the Royalty Properties at the date of transfer to the Trust.
Amortization of the Royalty is computed on a

                                       24
<PAGE>
                               MESA ROYALTY TRUST
                    NOTES TO FINANCIAL STATEMENTS--CONTINUED
unit-of-production basis and is charged directly to trust corpus since such
amount does not affect distributable income.

(3) BASIS OF ACCOUNTING

     The financial statements of the Trust are prepared on the following basis:

        (a) Royalty income recorded for a month is the amount computed and paid
        by the Working Interest Owners to the Trustee for such month rather than
        either the value of a portion of the oil and gas produced by the Working
        Interest Owners for such month or the amount subsequently determined to
        be the Trust's proportionate share of the net proceeds for such month;

        (b) Interest income, interest receivable and distributions payable to
        unitholders include interest to be earned on short-term investments from
        the financial statement date through the next date of distribution; and

        (c) Trust general and administrative expenses, net of reimbursements,
        are recorded in the month they accrue.

     This basis for reporting distributable income is considered to be the most
meaningful because distributions to the unitholders for a month are based on net
cash receipts for such month. However, these statements differ from financial
statements prepared in accordance with generally accepted accounting principles
because, under such principles, royalty income for a month would be based on net
proceeds from production for such month without regard to when calculated or
received and interest income for a month would be calculated only through the
end of such month.

(4) DISTRIBUTIONS TO UNITHOLDERS

     Under the terms of the Trust Indenture, the Trustee must distribute to the
unitholders all cash receipts, after paying liabilities and providing for cash
reserves as determined necessary by the Trustee. The amounts distributed are
determined on a monthly basis and are payable to unitholders of record as of the
last business day of each month. However, cash distributions are made quarterly
in January, April, July and October, and include interest earned from the
monthly record dates to the date of the distribution.

(5) FEDERAL INCOME TAXES

     The Trustee reports on the basis that the Trust is a grantor trust. Based
on its previous audit policy, the Internal Revenue Service (the "IRS") is
expected to concur with such action. No IRS ruling has been received or
requested with respect to the Trust, however, and no court case has been decided
involving identical facts and circumstances. It is possible, therefore, that the
IRS would assert upon audit that the Trust is taxable as a corporation and that
a court might agree with such assertion.

     As a grantor trust, the Trust will incur no federal income tax liability.
In addition, it will incur little or no federal income tax liability if it is
held to be a non-grantor trust. If the Trust were held to be taxable as a
corporation, it would have to pay tax on its net taxable income at the corporate
rate.

(6) SUPPLEMENTAL RESERVE INFORMATION (UNAUDITED)

     Estimates of the proved oil and gas reserves attributable to the Hugoton
Royalty Properties as of December 31, 1999, 1998 and 1997 are based on reports
prepared by PNR. The estimates were prepared in accordance with guidelines
established by the Securities and Exchange Commission (the "SEC").
Accordingly, the estimates were based on existing economic and operating
conditions. The reserve volumes and revenue values for the Trust net profits
interest were estimated by allocating to the Trust a portion of the estimated
combined net reserve volumes of the Hugoton Royalty Properties based on future
net revenue. Production volumes are allocated based on royalty income. Because
the net reserve volumes attributable to the Trust net profits interest are
estimated using an allocation of reserve volumes based on estimates of future
net revenue, a change in prices or costs will result in changes in the estimated
net reserve volumes. Therefore, the estimated net reserve volumes attributable
to the Trust net profits interest will vary if different future price and cost
assumptions are used. Only

                                       25
<PAGE>
                               MESA ROYALTY TRUST
                    NOTES TO FINANCIAL STATEMENTS--CONTINUED
costs necessary to develop and produce existing proved reserve volumes were
assumed in the allocation of reserve volumes to the Royalty.

     Estimates of proved oil and gas reserves attributable to the New Mexico
portion of the San Juan Basin Royalty Properties are based on a reserve report
prepared by Conoco. These estimates were prepared in accordance with SEC
regulations and on a basis generally consistent with those used to derive the
oil and gas reserves attributable to the Hugoton Royalty Properties.

     Estimates of proved oil and gas reserves attributable to the Colorado
portion of the San Juan Basin Royalty Properties have been omitted from the
Trust's reserve disclosures, as they represent less than 5% of the Trust's total
reserves and future net revenues.

     Future prices for natural gas and oil, condensate & natural gas liquids
were based on prices at each year end. Operating costs, production and ad
valorem taxes and future development and abandonment costs were based on current
costs as of each year end, with no escalation.

     There are numerous uncertainties inherent in estimating the quantities and
value of proved reserves and in projecting the future rates of production and
timing of expenditures. The reserve data below represent estimates only and
should not be construed as being exact. Moreover, the discounted values should
not be construed as representative of the current market value of the Royalty. A
market value determination would include many additional factors including: (i)
anticipated future oil and gas prices; (ii) the effect of federal income taxes,
if any, on the future royalties; (iii) an allowance for return on investment;
(iv) the effect of governmental legislation; (v) the value of additional
reserves, not considered proved at present, which may be recovered as a result
of further exploration and development activities; and (vi) other business
risks.

     Estimates of reserve volumes attributable to the Royalty are shown in order
to comply with requirements of the SEC. There is no precise method of allocating
estimates of physical quantities of reserve volumes between the Working Interest
Owners and the Trust, since the Royalty is not a working interest and the Trust
does not own and is not entitled to receive any specific volume of reserves from
the Royalty. The quantities of reserves attributable to the Trust have been and
will be affected by changes in various economic factors utilized in estimating
net revenues from the Royalty Properties. Therefore, the estimates of reserve
volumes set forth below are to a large extent hypothetical and differ in
significant respects from estimates of reserves attributable to a working
interest.

     The following schedules set forth (i) the estimated net quantities of
proved and proved developed oil, condensate and natural gas liquids and natural
gas reserves attributable to the Royalty, and (ii) the standardized measure of
the discounted future royalty income attributable to the Royalty and the nature
of changes in such standardized measure between years. These schedules are
prepared on the accrual basis, which is the basis on which the Working Interest
Owners maintain their production records and is different from the basis on
which the Royalty is computed. Certain reclassifications have been made to prior
year amounts to conform to the current year presentation.

                                       26
<PAGE>
                               MESA ROYALTY TRUST
                    NOTES TO FINANCIAL STATEMENTS--CONTINUED

    ESTIMATED QUANTITIES OF PROVED AND PROVED DEVELOPED RESERVES (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                        OIL,
                                                                                     CONDENSATE
                                                                                         AND
                                                                                     NATURAL GAS
                                                                                       LIQUIDS        NATURAL GAS
<S>                                                                                  <C>              <C>
                                                                                       (BBLS)            (MCF)
Proved Reserves:
  December 31, 1996...............................................................     1,872,781       38,814,775
     Revisions to previous estimates..............................................       (21,556)        (323,513)
     Production...................................................................      (164,716)      (2,886,137)
                                                                                     -----------      -----------
  December 31, 1997...............................................................     1,686,509       35,605,125
     Revisions to previous estimates..............................................        65,215       (1,841,219)
     Production...................................................................      (131,796)      (2,350,209)
                                                                                     -----------      -----------
  December 31, 1998...............................................................     1,619,928       31,413,697
     Revisions to previous estimates..............................................       484,393        3,314,482
     Production...................................................................      (132,109)      (2,115,612)
                                                                                     -----------      -----------
  December 31, 1999...............................................................     1,972,212       32,612,567
                                                                                     ===========      ===========
Proved Developed Reserves:
  December 31, 1997...............................................................     1,667,509       35,311,125
                                                                                     ===========      ===========
  December 31, 1998...............................................................     1,591,928       31,019,697
                                                                                     ===========      ===========
  December 31, 1999...............................................................     1,916,212       31,833,567
                                                                                     ===========      ===========
</TABLE>

- ------------

o   The estimated quantities of proved reserves for oil, condensate and natural
    gas liquids include oil and condensate reserves at December 31 of the
    respective years as follows: 1999, 70,000 Bbls; 1998, 57,000 Bbls; 1997,
    24,000 Bbls.

o   The Hugoton Royalty represents 46%, 46% and 61% of the estimated proved oil,
    condensate and natural gas liquids reserves and 50%, 54% and 65% of the
    estimated proved natural gas reserves as of December 31 of 1999, 1998 and
    1997, respectively.

         STANDARDIZED MEASURE OF FUTURE ROYALTY INCOME FROM PROVED OIL
           AND GAS RESERVES, DISCOUNTED AT 10% PER ANNUM (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                              DECEMBER 31,
                                                                                        ------------------------
                                                                                           1999         1998
                                                                                        -----------  -----------
                                                                                             (IN THOUSANDS)
<S>                                                                                     <C>          <C>
The Trust's proportionate share of future gross proceeds..............................  $   163,887  $   137,913
Less the Trust's proportionate share of --
  Future operating costs..............................................................      (54,849)     (67,907)
  Future capital costs................................................................       (2,873)      (2,154)
                                                                                        -----------  -----------
Future royalty income.................................................................      106,165       67,852
Discount at 10% per annum.............................................................      (59,470)     (37,648)
                                                                                        -----------  -----------
Standardized measure of future royalty income from
  proved oil and gas reserves.........................................................  $    46,695  $    30,204
                                                                                        ===========  ===========
</TABLE>

                                       27
<PAGE>
                               MESA ROYALTY TRUST
                    NOTES TO FINANCIAL STATEMENTS--CONTINUED

          CHANGES IN THE STANDARDIZED MEASURE OF FUTURE ROYALTY INCOME
   FROM PROVED OIL AND GAS RESERVES, DISCOUNTED AT 10% PER ANNUM (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                      DECEMBER 31
                                                                         -------------------------------------
                                                                            1999         1998         1997
                                                                         -----------  -----------  -----------
                                                                                    (IN THOUSANDS)
<S>                                                                      <C>          <C>          <C>
Standardized measure at beginning of year..............................  $    30,204  $    47,029  $    81,469
                                                                         -----------  -----------  -----------
  Revisions of previous estimates......................................        5,189       (3,790)      (1,936)
  Net changes in price and production costs............................       13,757      (11,528)     (31,364)
  Royalty income.......................................................       (5,475)      (6,210)      (9,287)
  Accretion of discount................................................        3,020        4,703        8,147
                                                                         -----------  -----------  -----------
  Net changes in standardized measure..................................       16,491      (16,825)     (34,440)
                                                                         -----------  -----------  -----------
Standardized measure at end of year....................................  $    46,695  $    30,204  $    47,029
                                                                         ===========  ===========  ===========
</TABLE>

- ------------

o   The Hugoton Royalty represents approximately 55% and 56% of the standardized
    measure of future royalty income for 1999 and 1998, respectively.

(7) SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

<TABLE>
<CAPTION>
                                                                       SUMMARIZED QUARTERLY RESULTS
                                                                            THREE MONTHS ENDED
                                                       ------------------------------------------------------------
                                                         MARCH 31        JUNE 30      SEPTEMBER 30     DECEMBER 31
                                                       -------------  -------------   -------------    ------------
1999:
<S>                                                    <C>            <C>             <C>              <C>
  Royalty income.....................................  $   1,208,881  $   1,206,359     $1,376,799      $ 1,683,458
  Distributable income...............................  $   1,211,895  $   1,207,226     $1,400,089      $ 1,685,152
  Distributable income per unit......................  $       .6503  $       .6478     $   .7513       $     .9042
1998:
  Royalty income.....................................  $   2,183,079  $   1,620,266     $1,400,356      $ 1,006,077
  Distributable income...............................  $   2,189,509  $   1,633,078     $1,412,663      $ 1,012,966
  Distributable income per unit......................  $      1.1749  $       .8763     $   .7580       $     .5436
</TABLE>

                                       28

<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

TO CHASE BANK OF TEXAS, NATIONAL ASSOCIATION (TRUSTEE)
AND THE UNITHOLDERS OF THE MESA ROYALTY TRUST:

     We have audited the accompanying statements of assets, liabilities and
trust corpus of the Mesa Royalty Trust as of December 31, 1999 and 1998, and the
related statements of distributable income and changes in trust corpus for each
of the three years in the period ended December 31, 1999. These financial
statements are the responsibility of the Trustee. Our responsibility is to
express an opinion on these financial statements based on our audits.

     We conducted our audits in accordance with auditing standards generally
accepted in the United States. Those standards require that we plan and perform
the audit to obtain reasonable assurance about whether the financial statements
are free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements. An
audit also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.

     These financial statements were prepared on the basis of accounting
described in Note 3, which is a comprehensive basis of accounting other than
accounting principles generally accepted in the United States.

     In our opinion, the financial statements referred to above present fairly,
in all material respects, the assets, liabilities and trust corpus of the Mesa
Royalty Trust as of December 31, 1999 and 1998, and its distributable income and
changes in trust corpus for each of the three years in the period ended December
31, 1999, on the basis of accounting described in Note 3.

                                          ARTHUR ANDERSEN LLP

Houston, Texas
March 20, 2000

                                       29
<PAGE>
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
        FINANCIAL DISCLOSURE.

     None.

                                    PART III

ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT.

     There are no directors or executive officers of the Registrant. The Trustee
is a corporate trustee which may be removed by the affirmative vote of the
majority at a meeting of the holders of units of beneficial interest of the
Trust at which a quorum is present.

ITEM 11.  EXECUTIVE COMPENSATION.

     Not applicable.

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.

     (A)  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS.

     The following information has been taken from filings with the Securities
and Exchange Commission on Forms 13D and 13G and Form 4.

<TABLE>
<CAPTION>
                                                                                          AMOUNT
                                                                                        AND NATURE         PERCENT
            TITLE OF CLASS OF                          NAME AND ADDRESS                OF BENEFICIAL         OF
            VOTING SECURITIES                         OF BENEFICIAL OWNER              OWNERSHIP(1)         CLASS
- -----------------------------------------  -----------------------------------------   -------------       -------
<S>                                        <C>                                         <C>                 <C>
Units of Beneficial Interest.............  Alpine Capital, L.P.                           781,016(2)         41.9%
                                           201 Main Street, Suite 3100
                                           Fort Worth, Texas 76102
Units of Beneficial Interest.............  Beck, Mack & Oliver LLC                        300,304(3)        16.11%
                                           330 Madison Avenue
                                           New York, NY 10017
</TABLE>

- ------------

(1) Under applicable regulations of the Securities and Exchange Commission,
    securities are deemed to be "beneficially" owned by a person who directly
    or indirectly holds or shares voting power or investment power with respect
    thereto.

(2) Information obtained from Schedule 13D Amendment No. 15 dated February 2,
    2000 of Alpine Capital, L.P. ("Alpine"), Robert W. Bruce III, Algenpar,
    Inc., J. Taylor Crandall, The Anne T. Bass and Robert M. Bass Foundation,
    Anne T. Bass and Robert M. Bass, and from Form 4's filed by Alpine, Mr.
    Bruce, Algenpar, Inc. and Mr. Crandall dated February 9, 2000. Alpine
    directly owns and has sole voting and dispositive power with respect to all
    of such units. Such number of units does not include 51,284 units (which
    constitutes approximately 2.8% of the 1,863,590 units outstanding) directly
    owned by The Anne T. Bass and Robert M. Bass Foundation (the
    "Foundation"). Mr. Bruce, by virtue of his position as a general partner
    of Alpine and as a principal of The Robert Bruce Management Co. Inc., which
    has shared dispositive power with respect to the 51,284 units owned by the
    Foundation, may be deemed to be a beneficial owner of the 781,016 units
    owned by Alpine and the 51,284 units owned by the Foundation. Mr. Crandall,
    by virtue of his position as President and sole stockholder of Algenpar,
    Inc., which is one of two general partners of Alpine, and as a director of
    the Foundation, may also be deemed to be a beneficial owner of the 781,016
    units owned by Alpine and the 51,284 units owned by the Foundation.

(3) Information obtained from Schedule 13G dated January 28, 2000 of Beck, Mack
    & Oliver LLC ("BMO"). BMO has shared dispositive power with respect to all
    of such units. All of such units are owned by the investment advisory
    clients of BMO.

     (B) SECURITY OWNERSHIP OF MANAGEMENT.  Not applicable.

                                       30
<PAGE>
     (C) CHANGES IN CONTROL.  Registrant knows of no arrangements, including the
pledge of securities of the Registrant, the operation of which may at a
subsequent date result in a change in control of the Registrant.

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS.

     Not applicable.

                                    PART IV

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K.

     (A)(1) FINANCIAL STATEMENTS

     The following financial statements are set forth under Part II, Item 8 of
this Annual Report on Form 10-K on the pages indicated.

<TABLE>
<CAPTION>
                                                                                                        PAGE IN THIS
                                                                                                          FORM 10-K
<S>                                                                                                     <C>
Statements of Distributable Income...................................................................      23
Statements of Assets, Liabilities and Trust Corpus...................................................      23
Statements of Changes in Trust Corpus................................................................      23
Notes to Financial Statements........................................................................      24
Report of Independent Public Accountants.............................................................      29
</TABLE>

     (A)(2) SCHEDULES

     Schedules have been omitted because they are not required, not applicable
or the information required has been included elsewhere herein.

     (A)(3) EXHIBITS

     (Asterisk indicates exhibit previously filed with the Securities and
Exchange Commission and incorporated herein by reference.)

<TABLE>
<CAPTION>
                                                                                              SEC FILE
                                                                                                 OR
                                                                                            REGISTRATION       EXHIBIT
                                                                                               NUMBER          NUMBER
                                                                                            ------------       -------
<S>                   <C>                                                                   <C>                <C>
      4(a)           *Mesa Royalty Trust Indenture between Mesa Petroleum Co. and Texas
                      Commerce Bank National Association, as Trustee, dated November 1,
                      1979...............................................................   2-65217                1(a)
      4(b)           *Overriding Royalty Conveyance between Mesa Petroleum Co. and Texas
                      Commerce Bank, as Trustee, dated November 1, 1979..................   2-65217                1(b)
      4(c)           *First Amendment to the Mesa Royalty Trust Indenture dated as of
                      March 14, 1985 (Exhibit 4(c) to Form 10-K for year ended December
                      31, 1984 of Mesa Royalty Trust)....................................    1-7884                4(c)
      4(d)           *Form of Assignment of Overriding Royalty Interest, effective April
                      1, 1985, from Texas Commerce Bank National Association, as Trustee,
                      to MTR Holding Co. (Exhibit 4(d) to Form 10-K for year ended
                      December 31, 1984 of Mesa Royalty Trust)...........................    1-7884                4(d)
      4(e)           *Purchase and Sale Agreement, dated March 25, 1991, by and among
                      Mesa Limited Partnership, Mesa Operating Limited Partnership and
                      Conoco, as amended on April 30, 1991 (Exhibit 4(e) to Form 10-K for
                      year ended December 31, 1991 of Mesa Royalty Trust)................    1-7884                4(e)
      27              Financial Data Schedule
</TABLE>

     (B) REPORTS ON FORM 8-K.

     No reports on Form 8-K were filed with the Securities and Exchange
Commission by the Trust during the fourth quarter of 1999.

                                       31
<PAGE>
                                   SIGNATURES

     PURSUANT TO THE REQUIREMENTS OF SECTION 13 OR 15(D) OF THE SECURITIES
EXCHANGE ACT OF 1934, THE REGISTRANT HAS DULY CAUSED THIS REPORT TO BE SIGNED ON
ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED.

                                          MESA ROYALTY TRUST

                                          By  CHASE BANK OF TEXAS, NATIONAL
                                             ASSOCIATION, TRUSTEE

                                          By        /s/  PETE FOSTER
                                                        Pete Foster
                                                   Senior Vice President
                                                      & Trust Officer

March 24, 1999

     The Registrant, Mesa Royalty Trust, has no principal executive officer,
principal financial officer, board of directors or persons performing similar
functions. Accordingly, no additional signatures are available and none have
been provided.

                                       32

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE 1999
FORM 10K AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>               DEC-31-1999
<PERIOD-END>                    DEC-31-1999
<CASH>                            1,678,624
<SECURITIES>                              0
<RECEIVABLES>                         6,528
<ALLOWANCES>                              0
<INVENTORY>                               0
<CURRENT-ASSETS>                  1,685,152
<PP&E>                           42,498,034
<DEPRECIATION>                 (29,824,772)
<TOTAL-ASSETS>                   14,358,414
<CURRENT-LIABILITIES>             1,685,152
<BONDS>                                   0
<COMMON>                                  0
                     0
                               0
<OTHER-SE>                       12,673,262
<TOTAL-LIABILITY-AND-EQUITY>     14,358,414
<SALES>                                   0
<TOTAL-REVENUES>                  5,530,408
<CGS>                                     0
<TOTAL-COSTS>                             0
<OTHER-EXPENSES>                     26,046
<LOSS-PROVISION>                          0
<INTEREST-EXPENSE>                        0
<INCOME-PRETAX>                   5,504,362
<INCOME-TAX>                              0
<INCOME-CONTINUING>               5,504,362
<DISCONTINUED>                            0
<EXTRAORDINARY>                           0
<CHANGES>                                 0
<NET-INCOME>                      5,504,362
<EPS-BASIC>                            2.95
<EPS-DILUTED>                          2.95


</TABLE>


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