Exxon Corporation v. Crosby-Mississippi ( 1998 )


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  •                      Revised October 5, 1998
    UNITED STATES COURT OF APPEALS
    For the Fifth Circuit
    No. 96-60761
    EXXON CORPORATION, A New Jersey Corporation,
    Plaintiff - Appellant-Cross-Appellee,
    VERSUS
    CROSBY-MISSISSIPPI RESOURCES, LTD., A MS Limited
    Partnership; LYNN CROSBY GAMMILL, General Partner;
    STEWART GAMMILL, III, General Partner; STEWART
    GAMMILL, III, as successor Trustee for
    Stewart Gammill IV, Trust No. 2;
    LUCIUS OLEN CROSBY GAMMILL, Trust No. 2;
    JENNIFER LYNN GAMMILL, Trust No. 2; LUCIOUS OLEN
    CROSBY GAMMILL; STEWART GAMMILL, IV; JENNIFER LYNN
    GAMMILL; STEWART GAMMILL, III, as successor
    Trustee for Stewart Gammill, IV,
    Defendants - Appellees-Cross-Appellants.
    Appeals from the United States District Court
    for the Southern District of Mississippi
    September 2, 1998
    Before POLITZ, Chief Judge, HIGGINBOTHAM, and DEMOSS, Circuit
    Judges.
    DeMOSS, Circuit Judge:
    This case requires us to interpret an oil and gas agreement
    entered into by Exxon Corporation (Exxon) and Crosby-Mississippi
    Resources, Ltd., et al. (CMR). Both parties appeal various rulings
    made by the district court.             For the following reasons we affirm
    the district court in part and vacate and remand in part.
    I.    Background
    In 1983, Exxon and CMR entered into a joint oil and gas
    Exploration Agreement to develop their respective mineral resources
    in an area of Mississippi.             Exxon held oil and gas leases covering
    more than 60,000 acres in the contract area, while CMR owned
    approximately 20,000 mineral acres in the contract area.                     Both
    Exxon and CMR contributed what they owned to the joint oil and gas
    exploration effort.         The parties agreed that Exxon contributed 76%
    and CMR 24% of the oil and gas interests in the contract area.
    Under the terms of the Exploration Agreement, Exxon had the
    exclusive right to propose the first exploratory well.                CMR could
    choose to participate in the exploratory well up to its 24%
    contractual share. If CMR chose to participate, it was required to
    bear its proportionate share of the costs of the drilling, testing,
    completion, and production expenses of the well.              By doing so, CMR
    would be entitled to 24% of the well's commercial production.                  If
    CMR chose not to participate, however, CMR could still be entitled
    to   a    "royalty"   due    to   certain      provisions   which   are   further
    explained below.
    2
    A substantial number of wells were drilled by the parties.
    CMR participated in some but not in others.         Almost from the
    beginning the parties were in disagreement over a number of issues.
    The disagreements eventually led to the filing of this action by
    Exxon in 1989 to collect amounts it claims are due from CMR for its
    share of various expenses.       CMR filed a counterclaim alleging
    numerous claims of its own.
    Because of the complexity of this case, the district court
    held a status conference on February 15, 1994.     At the conference
    the court entered an order delineating nine issues for separate
    discovery and trial.    This case is an appeal from the bench trial
    before the district court on the first of those issues: to what
    extent Exxon "earned" CMR’s interest in one particular section of
    the contract area. Because this first issue controlled many of the
    later disputes between the parties, the district court certified
    its ruling for immediate appeal under Rule 54(b) of the Federal
    Rules of Civil Procedure.1
    The Exploration Agreement
    1
    Rule 54 (b) provides in relevant part:
    When more than one claim for relief is presented in an
    action, whether as a claim, counterclaim, cross-claim or
    third-party claim, or when multiple parties are involved,
    the court may direct the entry of final judgment as to one
    or more but fewer than all of the claims or parties only
    upon an express determination that there is not just reason
    for delay and upon express direction for the entry of
    judgment.
    3
    Under the Exploration Agreement, Exxon was to drill the first
    exploratory well.          CMR could choose to participate in that well up
    to       CMR's   24%    contractual     interest.          If   CMR   chose    not   to
    participate, Exxon could "earn" CMR's 24% interest in the well so
    long as it was drilled in accordance with Paragraph 7 of the
    Exploration Agreement.             CMR, however, might still be entitled to a
    1/8 "customary royalty"2 if it owned the "actual, unleased mineral
    interests" in the drilling unit.3                Moreover, Paragraph 7 of the
    contract provided CMR with an additional 1/8 "overriding royalty"
    interest on "production allocated to the parties . . . calculated
    on       .   .   .   the   non-consenting       party's4    contractual       interest
    percentage."           Thus, in the simplest case -- where both parties
    collectively           possessed    100%   of    the   interests      underlying     a
    particular exploratory well -- CMR would receive an overriding
    royalty of 1/8 of 24% of the 100% joint interests of Exxon and
    2
    Under the majority of oil and gas leases, it is "customary"
    that the lessor retains a royalty interest consisting of a fraction
    of the gross amounts of oil or gas produced.        This customary
    royalty interest is often a 1/8 interest.
    3
    The Exploration Agreement defines a drilling unit as "the area
    fixed for the drilling of one well by order or rule of any state or
    federal body having authority."
    4
    The Exploration Agreement defines a consenting party as "a
    party who agrees to join in and pay its share of the drilling cost
    of any operation conducted under the provisions of this agreement."
    By contrast, a non-consenting party is "a party who elects not to
    participate in a proposed operation." For all issues addressed in
    this appeal, Exxon is the consenting party and CMR is the non-
    consenting party.
    4
    CMR.5
    If, under Paragraph 7, Exxon earned CMR's interest in an
    exploratory       well,   Paragraph       8    permitted     Exxon      to   earn    CMR's
    interest in any offset wells to the exploratory well, called
    "development wells." To earn CMR's interest in a development well,
    Paragraph     8    required    Exxon          to    "commence     drilling"     on    the
    development       well    within    180       days    of   the   completion      of   the
    exploratory well.           Each subsequent development well had to be
    drilled     within    180    days    of       the    completion    of    the   previous
    development well.         If Exxon complied with these time limits, it
    could earn CMR's interest in the development wells, subject to
    CMR's customary 1/8 royalty (if CMR owned the "actual unleased
    mineral interests") and the 1/8 overriding royalty on "production
    allocated to the parties."
    Exxon timely commenced drilling on the first exploratory well,
    Southern Minerals No. 1.           CMR chose not to participate.               This well
    was successful and produced gas.                     Exxon then drilled the first
    development well for Southern Minerals No. 1, called Southern
    Minerals No. 2, and a second development well, called Crown-
    Zellerbach No. 24-11.         Exxon ultimately drilled six more wells in
    the area, which are not relevant to this appeal.
    At trial, CMR challenged the procedures employed by Exxon in
    drilling the three wells in dispute here.                  First, CMR claimed that
    5
    Paragraph 7 also gave CMR the option to covert its royalty to
    a working interest when the well reached payout.
    5
    Exxon failed to comply with the Exploration Agreement with regard
    to the drilling of Southern Minerals No. 1, thus forfeiting its
    rights to earn CMR's interest in the eight other development wells.
    The district court ruled against CMR on this issue, and CMR does
    not appeal this ruling.                 CMR does appeal the district court's
    rulings on three other arguments CMR made at the bench trial.
    First, CMR asserts that Exxon improperly drilled the first
    development well, Southern Minerals No. 2, because it failed to
    "propose" the well to CMR in accordance with Paragraph 8.                             Second,
    it       contends    that   Exxon      did    not   "commence      drilling"       Southern
    Minerals No. 2 within 180 days from the "completion" of Southern
    Minerals No. 1, as stipulated in the contract.                        Third, it argues
    that      Exxon     violated     the   Exploration      Agreement         on    the   second
    development         well,   Crown-Zellerbach          No.     24-11,      because      Exxon
    contracted with a third-party to operate the well.                             According to
    CMR, each of these failures caused Exxon to forfeit its rights to
    CMR's interest in the relevant wells. The district court, however,
    ruled against         CMR   on    each       contention,     and    CMR   appeals      these
    rulings.
    Exxon was not completely successful in the bench trial,
    however.          Subsequent     to    the    signing   of    the    Agreement,        Exxon
    acquired "farm-ins" from various sources.6                    The trial court ruled
    6
    Exxon and CMR did not own all of the drilling rights
    throughout the Contract Area. This is not an uncommon situation in
    the oil and gas business.     The parties desiring to drill may
    acquire the outstanding interests by leasing them from the third
    6
    that the contract unambiguously required Exxon to pay CMR the 1/8
    overriding royalty on gas production occurring on the farm-ins that
    Exxon acquired after the inception of the Exploratory Agreement.
    Exxon appeals this ruling.
    II.   Analysis
    A district court's interpretation of a contract is a matter of
    law which we review de novo.         American Totalisator Co. v. Fair
    Grounds Corp., 
    3 F.3d 810
    , 813 (5th Cir. 1993).         Accordingly, we
    review the record independently and under the same standards that
    guided the district court.     
    Id. Because this
    suit is founded on diversity jurisdiction, the
    district court appropriately turned to Mississippi law for the
    applicable standard of contract interpretation.        See Erie R.R. Co.
    v. Tompkins, 
    304 U.S. 62
    (1938).         Under Mississippi law, "[w]here
    the interests of the parties to an instrument appear clear and
    unambiguous from the instrument itself, the Court should look
    parties who own unleased and outstanding interests.
    If those mineral interests are already under lease, the parties
    desiring to drill may purchase the leases from the holders of the
    leases. If the parties holding such leases wish to participate in
    the well, the parties may "farm-out" their leased interest to the
    parties desiring to drill the well. In such an event the original
    leaseholders pay their proportionate share of the production if the
    well is a producer.
    When the original leaseholder of a mineral lease sells (or
    "farms-out") its mineral rights to a purchaser wishing to drill in
    the leasehold, the purchaser acquires a "farm-in."
    7
    solely to the instrument and give same effect as written."    Barnett
    v. Getty Oil Co., 
    266 So. 2d 581
    , 586 (Miss. 1972).           See also
    Century 21 Deep South Properties, Ltd. v. Keys, 
    652 So. 2d 707
    , 716-
    17 (Miss. 1995).   It is by this standard that we, too, review the
    language of the Exploration Agreement and all other agreements
    incorporated therein.7
    A.   CMR's Claims
    CMR first claims that Exxon violated the Exploration Agreement
    by failing to "propose" the first development well, Southern
    Mineral No. 2. CMR points to the unambiguous language of Paragraph
    8 of the Exploration Agreement.8      CMR asserts that Paragraph 8
    7
    The parties incorporated an Operating Agreement and several
    attachments into the Exploration Agreement.
    8
    Paragraph 8 of the Exploration Agreement reads in pertinent
    part:
    If at the time each new exploratory well is proposed
    . . . then the consenting party shall by earning the
    non-consenting party's contractual interest in said
    exploratory well likewise earn the non-consenting
    party's rights to said non-consenting contractual
    interest to propose, drill, and complete or plug and
    abandon development wells which are drilled in
    offsetting contract units provided that no more than
    one hundred and eighty (180) days shall elapse between
    the date said exploratory well is completed . . . and
    the actual commencement of drilling of the first
    development well drilled in an offsetting contract
    unit to said exploratory well . . . . At such time as
    said consenting party fails to drill such development
    wells on said one hundred and eighty (180) day
    continuous basis and carry said non-consenting party's
    contractual interest, all unearned rights attributable
    8
    requires the proposal of development wells based merely on the fact
    that the word "propose" appears in the language of Paragraph 8,
    which pertains to development wells.               CMR also argues that the
    proposals     are    necessary    because   they    serve   the   informational
    purpose of     allowing CMR to monitor whether Exxon was meeting the
    180-day "continuous drilling" time frame required by the contract.
    We disagree with CMR's interpretation of the Agreement.
    CMR chose not to participate in the Southern Minerals No. 1
    exploratory well under Paragraph 7.           As such, Paragraph 8 provides
    that Exxon obtained the right to earn CMR's interest in the first
    development well, Southern Minerals No. 2.             By obtaining the right
    to earn CMR's interest in the well, under the express language of
    Paragraph 8, Exxon "likewise" earned CMR's "right to propose" the
    development well.       Furthermore, under Paragraph 7, it appears the
    purpose of proposing the initial exploratory well was to give CMR
    a chance to participate in that well.              However, when Exxon earned
    CMR's interest in the exploratory well, CMR could not participate
    in the subsequent development wells.            Essentially, proposing the
    development well at that point would serve no purpose.
    As evidence that development wells must be proposed, CMR also
    points   to    the    beginning    language   of     Paragraph    12:   "When   a
    development well is proposed . . . ."          This provision, however, is
    not helpful to CMR, as Paragraph 12 would have only applied if CMR
    to said non-consenting party's contractual interest
    shall revert to said non-consenting party . . . .
    9
    had participated in the exploratory well.
    CMR also claims that proposal was required even if it could
    not participate in the development well because CMR needed the
    information to keep track of whether Exxon was complying with the
    180-day continuous drilling time frame.            We again disagree.
    Under Paragraph 16 of the Exploration Agreement, and under the
    incorporated Operating Agreement, CMR was given access to all
    information that Exxon had concerning the contract area: "All
    parties shall have access at all reasonable times . . . to all
    information concerning the contract area which is in the possession
    of any other party."          Thus, CMR did not need to rely on the
    proposal mechanism to acquire needed information.
    Since    CMR   already   had   chosen   not    to   participate   in   the
    Southern Minerals No. 1 exploratory well, we find that Exxon was
    under no contractual duty to propose subsequent development wells.
    We thus affirm the judgement of the district court with regard to
    this claim.
    CMR's second claim is that Exxon forfeited its right to CMR's
    interest in the Southern Minerals No. 2 well, the first development
    well, because Exxon failed to commence drilling on that well within
    the 180-day time frame dictated by the Exploration Agreement.               In
    order to rule on this claim, we must decide when Exxon "actually
    commenced drilling" of the Southern Minerals No. 2 development
    well.
    The district court found the terms "complete" and "actual
    10
    commencement of drilling" ambiguous, and thus considered parol
    evidence in determining the parties' intended definition of these
    terms.   Once terms of a contract are found to be ambiguous, "the
    determination of the parties' intent through extrinsic evidence is
    a question of fact."   See Ham Marine, Inc. v. Dresser Indus., Inc.,
    
    72 F.3d 454
    , 459 (5th Cir. 1995) (quoting Watkins v. Petro-Search,
    Inc., 
    689 F.2d 537
    , 538 (5th Cir. 1982)).       We review bench trial
    findings of fact for clear error.     See Baldwin v. Stadler, 
    137 F.3d 836
    , 839 (5th Cir. 1998).     Such a finding is clearly erroneous
    "when we are left with a definite and firm conviction that a
    mistake has been made."   Sunbeam Oster Co. v. Whitehurst, 
    102 F.3d 1368
    , 1373 (5th Cir. 1996) (quotations and citations omitted).
    CMR challenges the district court's determination as to both
    when the Southern Minerals No. 1 exploratory well was "completed"
    and when "actual commencement of drilling" began on the Southern
    Minerals No. 2 development well.      We first consider on what date
    the "actual commencement of drilling" began on Southern Minerals
    No. 2, as our ruling in this regard may preclude the need for a
    determination of when the Southern Minerals No. 1 exploratory well
    was completed.
    On March 11, 1985, Griner Well Service drilled the hole for
    the conductor pipe of Southern Minerals No. 2.     The conductor pipe
    is an essential component of a gas well.    It is designed to prevent
    the hole from caving-in and to support the great weight of the
    11
    drill pipe. The conductor pipe consists of a large diameter casing
    that was placed, in this case, 133 feet in the ground.   The drill
    is then sent through the conductor pipe in the process of drilling
    for the gas.
    Griner Well Service used a small, truck-mounted "auger rig" to
    drill the hole for the conductor pipe.   After this was completed,
    a large drilling rig was used to drill for the gas.   On March 20,
    1985, Exxon completed its construction of the larger drilling rig.
    On this date, the primary drilling bit broke ground at the base of
    the conductor pipe.   Accordingly, Exxon reported March 20 as the
    "spud" date of the well.
    The district court determined that drilling "commenced" on
    Southern Minerals No. 2 on March 11, when Exxon had Griner Well
    Service drill the hole for the conductor pipe.   The court reasoned
    that the conductor pipe is an essential part of the well, and Exxon
    had no choice but to "drill" a hole in which to place the pipe.
    Moreover, concluded the district court, if the parties had meant
    for the "commencement of drilling" to involve the larger drilling
    rig only, they could have used language to that effect in the
    contract.
    CMR argues on appeal that the conductor pipe is merely a
    preparatory step to actual drilling.     It contends that actual
    drilling involves the use of drill equipment capable of uncovering
    gas, not the digging of a hole for conductor pipe that is necessary
    to commence later operations. Thus, according to CMR, drilling did
    12
    not actually commence on Southern Minerals No. 2 until the well's
    larger drill-bit broke the surface of the ground.
    Unfortunately, the reported case law in Mississippi gives no
    clear answer to the question of what activities constitute the
    "commencement of drilling."       CMR does cite several cases that it
    asserts establish that the laying of conductor pipe does not
    constitute the "commencement of drilling."             See Muth v. Aetna Oil
    Co., 
    188 F.2d 844
    , 848-49 (7th Cir. 1951), vacated on other
    grounds, 
    342 U.S. 844
    (1951); Hughes v. Ford, 
    92 N.E.2d 747
    , 749-51
    (Ill. 1950).      As Exxon points out, however, these cases are
    distinguishable    because     they   involve    bad    faith   attempts   by
    operators to prolong mineral leases. Presumably these courts would
    also hold that the bad faith use of the actual drill bit would
    likewise not constitute the commencement of drilling.
    Here, there is no question that the gas that was eventually
    extracted from the well came up through the hole containing the
    conductor pipe.    Thus, the creation of the conductor pipe hole was
    part and parcel of the actual drilling process, and was more than
    mere preparatory activity, such as the gathering of equipment or
    the clearing of land.         Rather, in creating the conductor hole,
    Exxon actually broke the surface of the land and drilled toward the
    gas.     We   cannot   find   clear   error     in   the   district   court's
    determination that in drilling the conductor pipe hole, Exxon
    actually commenced drilling.
    13
    CMR argues that the Southern Minerals No. 1 exploratory well
    was completed on September 15, 1984, whereas the district court
    found that this well was completed on September 27, 1984.          Because
    we find that the district court was not clearly erroneous in
    determining that drilling of the Southern Minerals No. 2 well
    commenced on March 11, 1985, we do not reach the question regarding
    the completion date of the Southern Minerals No. 2 well since both
    the date proposed by CMR and the date determined by the district
    court fall within 180 days of March 11.
    CMR's final claim is that Exxon failed to drill and operate
    the   second    development   well,   Crown-Zellerbach    No.   24-11,    in
    accordance with the terms of the Operating Agreement, incorporated
    by reference into the Exploration Agreement.            This claim arises
    from the fact that Exxon contracted with a third party, Prosper
    Energy Company, to operate the Crown-Zellerbach No. 24-11.               CMR
    contends that the Operating Agreement expressly appoints Exxon as
    the sole operator, and that under the Exploration Agreement the
    Operating      Agreement   "shall   govern   all   operations   under   this
    Exploration Agreement."        CMR's argument is that because Exxon
    entered into a separate operating agreement that designated Prosper
    Energy Company as the operator of Crown-Zellerbach No. 24-11, Exxon
    could not earn CMR's interest in that unit.
    14
    Unlike the Exploration Agreement, which was written by the
    parties, the Operating Agreement is a standard form.           "Exxon" was
    typed in and appears in two blanks that name the operator.           Article
    V.D. of the Operating Agreement, however, was altered by the
    parties to include the following introductory phrase: "Except as to
    wells in which Exxon or one of CMR, et al is operator."         Obviously,
    the Operating Agreement itself contemplates the situation where
    someone other than Exxon would operate a well.            CMR's contention
    that the Agreement specifies only Exxon as the operator cannot be
    sustained.
    We   also   reject   CMR's   argument   that   the   identity   of   the
    operator is tied to whether one of the parties can earn the other's
    interest.    This contention finds no support in Paragraph 8 of the
    Exploration Agreement, which explicitly addresses the procedures
    necessary for one party to earn the interest of the other.           Nowhere
    in Paragraph 8 is there any mention of the identity of an operator
    or how the identity of an operator affects the earning of another
    party's interest.
    CMR further argues that a third party is authorized to operate
    a well under Paragraph 10 of the Exploration Agreement only when
    CMR and Exxon do not together own a majority of the drilling
    interests in the drilling unit for that well.                We find this
    argument unpersuasive and contrary to our reading of the contract.
    Nowhere in Paragraph 10 do we find anything to support CMR's
    reading of this provision.
    15
    Paragraph 10 does not address when a third party can operate
    a well.9   Rather, this provision addresses the situation in which
    one of the parties to the Exploration Agreement desires to contract
    with a third party.         In such a situation, Paragraph 10 provides
    that the party wishing to contract with a third party must notify
    the other party to the Exploration Agreement of all terms and
    conditions of the contemplated contract.                  However, notice is
    required only when CMR and Exxon do not together own a majority of
    the drilling interests in the drilling unit for that well.
    Paragraph   10   is    nothing   more    than   a    notice   provision.
    Furthermore, Paragraph 10 is not even applicable in this situation
    since CMR and Exxon did, in fact, together own the majority of the
    drilling interests     in     the   drilling   unit   on   which    the   Crown-
    Zellerbach No. 24-11 was operated.             Accordingly, we find that
    neither Paragraph 10, nor any other provision in the Exploration or
    9
    Paragraph 10 provides in pertinent part:
    If any party should desire to enter into any agreement
    or agreements (1) for the drilling of any well or
    wells (other than Drilling Contracts and related
    service contracts) in any area in which any drilling
    unit will contain any part of the contract area, and
    in which are the parties' interests committed under
    this exploration agreement will not constitute a
    majority of the drilling interests, or (2) for farming
    out any interests in the contract area, said party
    shall give written notice to all other parties of the
    specific lands to be covered by said agreement(s) and
    of all terms and conditions under which said party
    desires to enter into said agreement(s), together with
    all other requirements for notice under Article VI.B.
    [of the Operating Agreement].
    16
    Operating Agreements, prohibited Exxon from contracting with a
    third party to operate the Crown-Zellerbach No. 24-11 well.
    B.    Exxon's Claim
    Having affirmed the district court's ruling with regard to all
    claims raised on CMR's cross-appeal, we now turn to Exxon's appeal
    of        the    district    court's      determination         that       the    contract
    unambiguously         entitles     CMR    to     a    1/8    overriding      royalty     on
    production         from    farm-ins     acquired      solely    by     Exxon.      Cities
    Services,         Clayton    Williams,     and       David    Smith    owned      drilling
    interests in the contract area.                      Exxon negotiated with these
    parties and they "farmed-out" their interests to Exxon.10                               Both
    Exxon and CMR agree that these farm-ins are "acquisitions" under
    the terms of the Exploration Agreement.
    We note that our "broad standard of review includes the
    initial         determination    of     whether      the    contract    is   ambiguous."
    American Totalisator Co. v. Fair Grounds Corp., 
    3 F.3d 810
    , 813
    (5th Cir. 1993).             And, whether a contract is ambiguous is a
    question of law reviewed de novo.                 Triad Elec. & Controls, Inc. v.
    Power Sys. Eng'g, 
    117 F.3d 180
    , 187 (5th Cir. 1997).
    With    regard    to   this    particular         issue,    we   look    to   all
    provisions in the Agreement that address the overriding royalty and
    10
    From Exxon's point of view, these farm-outs are considered
    "farm-ins."
    17
    all    provisions   that   address   acquisitions.     Having   thoroughly
    reviewed all such provisions, we find the language dealing with the
    overriding royalty ambiguous regarding the applicability of the
    overriding royalty to acquisitions made solely by one party.             See
    Century Twenty-One v. Keyes, 
    652 So. 2d 707
    , 716-717 (Miss. 1995)
    ("If . . . a careful reading of the instrument reveals it to be
    less    than   clear,   definite,    explicit,   harmonious   in   all   its
    provisions, and free from ambiguity throughout, the court is
    obligated to pursue the intent of the parties, and, to determine
    the intent, must resort to extrinsic aid.").
    We turn first to the relevant portions of the Agreement that
    refer to the overriding royalty.           Paragraph 7 of the Exploration
    Agreement creates "an overriding royalty of one-eighth (1/8) of
    eight-eighths (8/8) of production allocated to the parties, without
    any reduction for any royalties and/or any other burdens, and
    calculated on said non-consenting parties' contractual interest
    percentage . . . subject to the right of conversion at payout."
    Paragraph 7 applies to all exploration wells, including Southern
    Minerals No. 1.
    CMR is a non-consenting party as to the Southern Minerals No.
    1 well. Since Exxon earned CMR's interest in Southern Minerals No.
    1, Exxon acknowledges that it has the obligation, under Paragraph
    7, to pay CMR, in addition to its royalty on "actual unleased
    mineral interests," the overriding royalty on its contractual
    18
    interest (24%) of the combined working interest controlled by CMR
    and Exxon jointly.        But Exxon does not agree that the combined
    working interest on which the overriding royalty is calculated
    includes the working interest acquired by Exxon from the farm-ins.
    The same dispute exists under Paragraph 8 regarding the
    development wells.        Since Exxon earned CMR's interest in the
    Southern Minerals No. 1 well, Paragraph 8 provides that Exxon also
    obtained the right to earn the interest of CMR in development wells
    (the remaining 8 wells in the contract area).           Since Exxon earned
    the interest of CMR in the other 8 wells, Exxon incurred the
    obligation, under Paragraph 8, to pay CMR the same overriding
    royalty interest.    Where we find the Agreement ambiguous is in its
    silence as how the overriding royalty applies to acquisitions made
    solely by one party.
    In addressing this issue, the district court reasoned that
    "production allocated to the parties" referred to all working
    interests of Exxon and CMR, regardless of when and how those
    interests were acquired.         The district court thus found that CMR
    deserved an overriding royalty interest on all production jointly
    controlled by the two parties in the contract area, including the
    production from Exxon's newly acquired interests.          While this is a
    reasonable interpretation of the overriding royalty provision,
    Exxon asserts an equally plausible interpretation of "production
    allocated to the parties."
    The   purpose   of    the   Agreement   was   to   pool   the   combined
    19
    interests    of   Exxon    and   CMR,     with    each     party   receiving     a
    proportionate contractual interest in the pooled interests based on
    each   party's    proportionate    contribution       to    that   pool.       The
    contractual interests granted to each party corresponded to the
    proportionate contribution to the pool by each party.                 The parties
    agreed that Exxon's contribution to the pool was 76% of the whole,
    and CMR's was 24%.     But Exxon later acquired additional interests
    by way of farm-ins.       Thus, the district court's ruling grants CMR
    an overriding royalty in these later-acquired acquisitions for
    which CMR made no contribution.         Exxon contends that to give CMR an
    overriding royalty on farm-ins which Exxon alone purchased would
    upset the original calculations of the parties used to determine
    each party's contractual interest.
    Unlike the district court, we find ambiguity in the statement
    "production allocated to the parties" because it is simply unclear
    whether     "production    allocated"        refers   to    working    interests
    acquired solely by one party after the inception of the agreement.
    Review of the provisions in the Agreement that address acquisitions
    are not helpful to resolving this ambiguity, and serve only to
    further confuse the issue.
    Exxon calls our attention to Paragraph 13 of the Exploration
    Agreement as the critical provision of the contract that concerns
    acquisitions. We, however, do not find Paragraph 13 instructive on
    the issue of the overriding royalty. Paragraph 13 of the Agreement
    simply requires Exxon to notify CMR of the farm-in acquisitions and
    20
    to give CMR the chance "to participate in such acquisition[s], for
    the dollar price paid and/or possible participation in the drilling
    of the well, if that be required to earn the farm-out."11
    Thus, Paragraph 13 only provides a mechanism by which one
    party    can   choose   to    participate   in    another's    acquisition.
    Paragraph 13 does not speak to whether acquisitions in which one
    party does not participate become part of the pool of interests to
    which   the    overriding    royalty   applies.    Paragraph    13   is   not
    instructive with regard to the overriding royalty.
    Though another provision of the contract also brought to our
    attention by Exxon appears relevant to the issue of the overriding
    royalty, we find it creates further ambiguity in the contract.             As
    11
    In this case, both Exxon and CMR agree that participation in
    the drilling of a well was required in order to participate in the
    acquisitions.
    Preliminary notice of the acquisition of the farm-ins was given
    by Exxon to CMR by letter after Southern Minerals No. 1 had been
    proposed but before drilling was commenced. Negotiations regarding
    the farm-ins had not been completed and the letter stated that
    "[f]ull information regarding participation in these acquisitions
    will be provided by separate letter."      The parties agree that
    additional and complete information regarding the farm-ins was
    never provided by Exxon to CMR.
    The district court found that the notice was insufficient to
    comply with the requirements of Paragraph 13. Thus, CMR was never
    given its opportunity to participate in the farm-ins. Exxon points
    out that CMR decided not to participate in the Southern Minerals
    No. 1 exploratory well and as a result, CMR lost its right to
    participate in any other development well in the contract area.
    The district court found that the notice issue was not controlling
    on the question of whether CMR is entitled to an overriding royalty
    on the interests acquired by Exxon by way of the farm-ins. We
    agree with the district court in this respect.
    21
    previously discussed, the Operating Agreement is incorporated by
    reference into the Exploration Agreement as Exhibit II.12
    Exhibit A to Exhibit II has five separate provisions.                         The
    third provision pertains to the "percentages or fractional interest
    of parties to this Agreement."                       In this provision, the parties
    agree to the contractual interest percentages of Exxon (76%) and
    CMR (24%).         This provision also includes a statement pertaining to
    acquisitions: "An Acquisition by less than all of the Parties shall
    not affect the percentages of parties to this agreement except as
    to        the   Contract      Unit[s]13   in    which    all   or    any    part   of   said
    Acquisition may be included."                  We consider this statement in light
    of Paragraph 8, the applicable overriding royalty provision of this
    contract.
    Paragraph      8    provides    that        the    overriding      royalty     is
    "calculated on said non-consenting party's (CMR's) contractual
    interest."         Contractual interest is defined in Exhibit I as "the
    contractual percentage interest attributable to each party as shown
    on Exhibit A."
    Exhibit A, however, seems to provide that the contractual
    percentages         are       not   "affected"       when    fewer   than    all   parties
    participate in an acquisition "except as to the Contract Unit[s] in
    12
    Exhibit I to the Exploration Agreement is a list of
    definitions clarifying the meaning of terms used in the agreement.
    13
    The Contract Unit is the area ultimately established for the
    well to be drilled.
    22
    which [the] Acquisition may be included."                        This provision seems to
    suggest that percentages of contractual interests change with
    respect       to       wells   drilled        in   contract   units      where    there   are
    acquisitions made solely by one party.                     If this is the case, it is
    unclear to this Court whether the overriding royalty that is
    "calculated on said non-consenting party's contractual interest" is
    calculated         on    the   original        overall    contractual      interest,      the
    contractual            interest     in    a   particular      contract     unit,    or    some
    combination thereof.
    We find that the phrase "production allocated to the parties
    .   .    .   calculated        on    said      non-consenting      party's       contractual
    interest" is ambiguous.                  The intent of the parties simply can not
    be determined from the language, and thus, the district court was
    obligated to pursue the intent of the parties, and, to determine
    the intent, should have examined parol evidence.                          Century Twenty-
    One v. Keyes, 
    652 So. 2d 707
    , 716-717 (Miss. 1995).
    For the foregoing reasons, we AFFIRM the district court's
    rulings on CMR's claims and VACATE the decision of the district
    court that the Exploration Agreement is unambiguous with respect to
    whether CMR is entitled to an overriding royalty on Exxon's farm-in
    acquisitions.              Accordingly,            we   REMAND    this     case    for    the
    consideration of parol evidence to determine the parties' intent
    with respect to that issue.
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