IN THE SUPREME COURT OF TEXAS

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No. 18-0581

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PIRANHA PARTNERS, RANDOLPH MUNDT, AND THOMAS H. OWEN,JR.,

INDIVIDUALLY AND AS PARTNERS OF PIRANHA PARTNERS, AND CHARLES RAY 

OWEN, PETITIONERS,

v.

JOE B. NEUHOFF AND NANCY M. NEUHOFF; THOMAS H. NEUHOFF AND JUDY A.

NEUHOFF; ROBERT V. NEUHOFF AND ANDREA D. NEUHOFF; AND BOCA VAIL, INC.,

RESPONDENTS

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ON PETITION FOR REVIEW FROM THE

COURT OF APPEALS FOR THE SEVENTH DISTRICT OF TEXAS

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Argued November 6, 2019

JUSTICE BOYD delivered the opinion of the Court, in which CHIEF JUSTICE HECHT,JUSTICE 

GREEN, JUSTICE GUZMAN, JUSTICE DEVINE, JUSTICE BLACKLOCK, AND JUSTICE BUSBY joined.

JUSTICE BLAND filed a dissenting opinion, in which JUSTICE LEHRMANN joined.

This case involves a written assignment of an overriding royalty interest in minerals 

produced from land in Wheeler County. The assignment identifies the single well that was 

producing at the time of the assignment, the land on which that well is located, and the lease under 

which the overriding royalty interest exists. The issue is whether the assignment conveyed the 

assignor’s interest only in production from the identified well, in production from any well drilled 

on the identified land, or in all production under the identified lease. Rejecting inapplicable rules 
2

of construction and finding no reliable guidance from the surrounding facts and circumstances, we 

construe the assignment in its entirety and conclude that it unambiguously conveyed the assignor’s 

overriding royalty interest in all production under the lease. We reverse the court of appeals’ 

judgment and reinstate the trial court’s summary judgment.

I.

Background

In 1975, Neuhoff Oil & Gas purchased an undivided two-thirds interest in a mineral lease 

known as the Puryear Lease. The lease—between the Puryears (and others) as lessors and Marie 

Lister as lessee—covered all of the minerals under a tract of land referred to as Section 28.1 A few 

years later, Neuhoff Oil sold and assigned its two-thirds interest but reserved for itself a 3.75% 

overriding royalty interest on all production under the Puryear Lease.2

From 1975 through 1999, only one well was completed on Section 28. That well, named 

the Puryear B #1-28, was located in the section’s northwest quarter. Neuhoff Oil received royalty 

payments on production from the Puryear B #1-28 until 1999, when it sold its overriding royalty 

interest along with several other mineral interests through an auction. Piranha Partners was the 

successful bidder. To effectuate the sale, Neuhoff Oil and Piranha executed a written agreement 

1 The Puryear Lease reserved a 3/16 royalty interest to the lessors. 

2 An overriding royalty interest is a non-participating interest in the oil and gas produced at the surface, free 

of production expenses, carved out of the working interest under a mineral lease. Sw. Energy Prod. Co. v. BerryHelfand, 491 S.W.3d 699, 714 n.9 (Tex. 2016); Paradigm Oil, Inc. v. Retamco Operating, Inc., 372 S.W.3d 177, 180 

n.1 (Tex. 2012); Ridge Oil Co. v. Guinn Invs., Inc., 148 S.W.3d 143, 155 (Tex. 2004). It derives from and burdens the 

lease, and absent agreement otherwise, terminates when the lease itself terminates. See Apache Deepwater, LLC v. 

McDaniel Partners, Ltd., 485 S.W.3d 900, 905 (Tex. 2016). Because its validity depends on the lease, “one of the 

most essential elements of a contract for the conveyance of such an overriding royalty interest is a description of the 

lease from which it comes; for it is the lease which denotes the life and breadth of the estate to be assigned.” Gruss v. 

Cummins, 329 S.W.2d 496, 501 (Tex. Civ. App.—El Paso 1959, writ ref’d n.r.e.).
3

entitled “Assignment of Overriding Royalty Interests and Oil and Gas Leases.” The following 

year, Neuhoff Oil went out of business and assigned all of its remaining assets to individual 

members of the Neuhoff family.3

After 1999, the operator under the Puryear Lease paid the 3.75% overriding royalty on 

production from the Puryear B #1-28 to Piranha. Over time, the operator drilled additional wells 

on Section 28, including at least one other in the section’s northwest quarter. The operator paid a 

3.75% overriding royalty on production from these new wells to the Neuhoffs, believing Neuhoff 

Oil had conveyed to Piranha only the overriding royalty interest in production from the Puryear B 

#1-28, not in all production from Section 28’s northwest quarter or under the Puryear Lease. In 

2012, however, the operator obtained title opinions concluding that Piranha owned the overriding 

royalty interest on all production under the Puryear Lease, and not just production from the Puryear 

B #1-28. Based on these opinions, the operator retroactively paid Piranha the overriding royalty 

on all Section 28 wells and demanded a refund of the amounts it had paid the Neuhoffs. 

The Neuhoffs filed this suit, claiming Neuhoff Oil assigned to Piranha its overriding 

royalty only in production from the Puryear B #1-28. On summary-judgment cross-motions, the 

trial court sided with Piranha, declaring that Neuhoff Oil sold the overriding royalty on all 

production under the Puryear Lease, which covered all of Section 28.4 The court of appeals 

3 Following the death of one Neuhoff family member, an entity known as Boca Vail acquired a portion of 

Neuhoff Oil’s assets. 

4 The trial court actually granted a motion for partial summary judgment, but it severed all remaining claims, 

counterclaims, and defenses into a separate case, making this judgment final, and then abated the severed case pending 

the resolution of this appeal. 
4

disagreed with the trial court, but it also disagreed with the Neuhoffs. It held that Neuhoff Oil sold 

the overriding royalty in production not from all of Section 28, and not just from the Puryear B 

#1-28, but from all of the northwest quarter of Section 28. Neuhoff v. Piranha Partners, 578 

S.W.3d 543, 551–52 (Tex. App.—Amarillo 2018). We granted Piranha’s petition for review. The 

Neuhoffs—content to give up any interest in production from any wells on Section 28’s northwest 

quarter—did not file a cross-petition.

II.

The Assignment

We must construe the written Assignment of Overriding Royalty Interests and Oil and Gas 

Leases through which Neuhoff Oil assigned its interests to Piranha following the 1999 auction. As 

with any deed or contract, our task is to determine and enforce the parties’ intent as expressed 

within the four corners of the written agreement. Perryman v. Spartan Tex. Six Capital Partners, 

Ltd., 546 S.W.3d 110, 117–18 (Tex. 2018).5 We must first determine whether the Assignment is 

ambiguous, considering its language as a whole in light of well-settled construction principles and 

the relevant surrounding circumstances. URI, 543 S.W.3d at 763; First Bank v. Brumitt, 519 

5 See also Murphy Expl. & Prod. Co.-USA v. Adams, 560 S.W.3d 105, 108 (Tex. 2018); URI, Inc. v. Kleberg 

County, 543 S.W.3d 755, 757 (Tex. 2018); Wenske v. Ealy, 521 S.W.3d 791, 794 (Tex. 2017); Great Am. Ins. Co. v. 

Primo, 512 S.W.3d 890, 893 (Tex. 2017); N. Shore Energy, L.L.C. v. Harkins, 501 S.W.3d 598, 602 (Tex. 2016); 

Italian Cowboy Partners, Ltd. v. Prudential Ins. Co. of Am., 341 S.W.3d 323, 333 (Tex. 2011); Luckel v. White, 819 

S.W.2d 459, 461–62 (Tex. 1991); Coker v. Coker, 650 S.W.2d 391, 393 (Tex. 1983); Sun Oil Co. v. Madeley, 626 

S.W.2d 726, 727–28 (Tex. 1981 ); Citizens Nat’l Bank in Abilene v. Tex. & P. Ry. Co., 150 S.W.2d 1003, 1006 (Tex. 

1941).
5

S.W.3d 95, 109 (Tex. 2017).6 Whether the agreement is ambiguous is a question of law that we 

decide de novo. URI, 543 S.W.3d at 763.7

That the parties interpret an agreement differently does not make it ambiguous; ambiguity 

exists only if both parties’ interpretations are reasonable. Id. at 763, 765. But it does not exist if 

the agreement’s language creates a definite or certain legal meaning. Id. at 765.

8 If we conclude 

the agreement is ambiguous, we must remand for a jury to determine its meaning as a factual issue; 

but if it is unambiguous, we will determine its meaning as a matter of law. Id. at 763, 766; Coker, 

650 S.W.2d at 393–94. In doing so, we look not for the parties’ actual intent but for their intent as 

expressed in the written document. Luckel, 819 S.W.2d at 461–62.

9 We consider the entire 

agreement and, to the extent possible, resolve any conflicts by harmonizing the agreement’s 

provisions, rather than by applying arbitrary or mechanical default rules. Wenske, 521 S.W.3d at 

792, 796.10

6 See also Coker, 650 S.W.2d at 393–94.

7 See also Harkins, 501 S.W.3d at 602; Coker, 650 S.W.2d at 394.

8 See also Brumitt, 519 S.W.3d at 105; Primo, 512 S.W.3d at 893; Harkins, 501 S.W.3d at 602; Apache 

Deepwater, 485 S.W.3d at 904; FPL Energy, LLC v. TXU Portfolio Mgmt. Co., L.P., 426 S.W.3d 59, 63 (Tex. 2014); 

Gilbert Tex. Constr., L.P. v. Underwriters at Lloyd’s London, 327 S.W.3d 118, 133 (Tex. 2010); Coker, 650 S.W.2d 

at 393–94; Sun Oil, 626 S.W.2d at 727.

9 See also Apache Deepwater, 485 S.W.3d at 906.

10 See also Hysaw v. Dawkins, 483 S.W.3d 1, 4 (Tex. 2016); FPL Energy, 426 S.W.3d at 63; Concord Oil 

Co. v. Pennzoil Expl. & Prod. Co., 966 S.W.2d 451, 457 (Tex. 1998); Luckel, 819 S.W.2d at 462; Coker, 650 S.W.2d 

at 393; Citizens Nat’l Bank, 150 S.W.2d at 1006.
6

The Granting Clause

We begin with the Assignment’s granting clause, which appears within the introductory 

paragraph of Section I and provides:

[Neuhoff Oil] does hereby assign, sell and convey unto [Piranha] 

. . . without warranty or covenant of title, express or implied, subject 

to the limitations, conditions, reservations and exceptions 

hereinafter set forth . . . all of [Neuhoff Oil’s] right, title and interest 

in and to the properties described in Exhibit “A” (the “Properties”).

This clause does not describe the interest being assigned, but instead incorporates the description 

provided in a document attached as Exhibit A. Following this introductory paragraph, but still 

within Section I, are two numbered paragraphs. Paragraph 1 of Section I also incorporates the 

description in Exhibit A: 

All oil and gas leases, mineral fee properties or other interests, 

INSOFAR AND ONLY INSOFAR AS set out in Exhibit A . . . 

whether said interest consists of leasehold interest, overriding 

royalty interest, or both . . . .

So the Assignment requires us to look to Exhibit A to determine what interest was assigned. 

Exhibit A, however, is not particularly helpful.

Exhibit A

The document attached to the Assignment as Exhibit A consists of two pages. Only the 

second page relates to Neuhoff Oil’s interest in the Puryear Lease and the Puryear B #1-28 well. 

The entirety of its description appears as follows:

Lands and Associated Well(s): Puryear #1-28

Wheeler County, Texas

NW/4, Section 28, Block A-3, HG&N Ry Co. Survey 

Oil and Gas Lease(s)/Farmout Agreement(s):
7

Oil & Gas Lease(s)

Lessor: [the Puryears]

Lessee: Marie Lister

Recorded: Volume 297, Page 818

The first part of this description, addressing the “Lands and Associated Well(s),” identifies 

the well that existed on Section 28 at the time of the assignment (“Puryear #1-28”)11 and the portion 

of the “land” on which that well was located (“NW/4, Section 28”). The second part, addressing 

“Oil and Gas Lease(s)/Farmout Agreement(s),” identifies the “lease” under which Neuhoff Oil 

owned its 3.75% overriding royalty interest (the Puryear lease).12 The issue is whether the 

Assignment conveys Neuhoff Oil’s overriding royalty interest in minerals produced by the well, 

from the land, or under the lease. In other words, which of the three identifies the “Properties” the 

Assignment conveys?

11 Although Exhibit A identifies the well as the “Puryear #1-28,” omitting the “B,” the parties do not dispute 

that it refers to the “Puryear B #1-28.”

12 The Neuhoffs note that the Puryear Lease is recorded at page 818 of volume 247, not 297, of the Wheeler 

County property records. The document filed at page 818 of volume 297 does not relate to the Puryear Lease or to 

those parties at all. Piranha suggests that this was a “mere scrivener’s error,” and the Neuhoffs do not disagree. When 

part of a deed’s property description is incorrect, we will disregard that part “as surplusage” and enforce the deed if 

the remainder of the description identifies the land with sufficient certainty. Reserve Petroleum Co. v. Harp, 226 

S.W.2d 839, 841 (Tex. 1950); see also Henderson v. Gunter, 328 S.W.2d 868, 870 (Tex. 1959) (“These mistakes will 

be corrected so as to carry out the true intention of the grantor as revealed from a reading of the instrument as a 

whole.”). Both parties agree that Exhibit A identifies the Puryear Lease, although the Neuhoffs note that we must read 

the Oil and Gas Lease(s)/Farmout Agreement(s) section together with the Lands and Associated Well(s) section to 

reach that conclusion. We agree that, reading all of the language together, Exhibit A sufficiently establishes that the 

parties intended to identify the Puryear Lease, the Puryear B #1-28 well, and the northwest quarter of Section 28. We 

do not agree with the Neuhoffs’ contention, however, that reading the references together requires the conclusion that 

the interest is “necessarily limited to the northwest quarter of section 28.” The references to the Puryear B #1-28 and 

to the northwest quarter of Section 28 confirm that the document identifies the Puryear Lease, but we are still left with 

the question of which of the three describes the scope of the overriding royalty interest conveyed.
8

Piranha argues that the reference to the lease identifies the interest conveyed, so Neuhoff 

Oil assigned all of its overriding royalties due under the Puryear Lease, which covered all of 

Section 28, and which (at the time of the assignment) were being produced from the Puryear B #1-

28, which was located in Section 28’s northwest quarter. The Neuhoffs argued in the trial court 

that the reference to the well identifies the interest conveyed, so Neuhoff Oil assigned only its 

overriding royalties in the production from the Puryear B #1-28, which was located in Section 28’s 

northwest quarter and from which royalties derived under the Puryear Lease. The court of appeals 

held, and the Neuhoffs now agree, that the reference to the lands identifies the interest conveyed, 

so Neuhoff Oil assigned the overriding royalties produced from Section 28’s northwest quarter, 

which (at the time of the assignment) were produced from the Puryear B #1-28 and derived from 

the Puryear Lease. Nothing in Exhibit A, however, expressly states whether the well, the land, or 

the lease identifies the scope of the interest conveyed.

Rules of Construction

To support its position, Piranha relies primarily on rules we have sometimes applied when 

construing deeds, assignments, and similar documents. Specifically, Piranha asserts we must 

construe the Assignment (1) “to confer upon the grantee the greatest estate that the terms of the 

instrument will permit,” Waters v. Ellis, 312 S.W.2d 231, 234 (Tex. 1958),13 (2) to reject any 

alleged exception, reservation, or limitation that is not expressly and clearly stated in the written 

13 See also Garrett v. Dils Co., 299 S.W.2d 904, 906 (Tex. 1957) (“[S]hould there be any doubt as to the 

proper construction of the deed . . . [it should] be held to convey the greatest estate permissible under its language.”); 

Sharp v. Fowler, 252 S.W.2d 153, 154 (Tex. 1952) (“[A] deed passes whatever interest a grantor has in the land, in 

the absence of [l]anguage showing an intention to grant a less estate.”).
9

document, Perryman, 546 S.W.3d at 119,14 and (3) to resolve any doubts against the party who 

drafted the document, Garrett, 299 S.W.2d at 906. According to Piranha, the court of appeals 

ignored these rules and instead announced a “new rule” that permits courts to imply a limitation 

on a grant—even in the absence of any language that excepts or reserves an interest or otherwise

limits the grant—whenever it appears to the court that the limitation is necessary to “harmonize” 

apparently conflicting provisions. 

In response, the Neuhoffs argue that these construction rules do not apply because the 

Assignment is unambiguous and we can determine the parties’ intent simply by harmonizing its 

language, as the court of appeals has done. See, e.g., Citizens Nat’l Bank, 150 S.W.2d at 1006 

(“Courts do not resort to arbitrary rules of construction where the intention of the parties is clearly 

expressed in unambiguous language.”).15 According to the Neuhoffs, the court of appeals properly 

harmonized Exhibit A’s references to the well, the land, and the lease, making any reliance on 

arbitrary construction rules unnecessary and improper.

The Neuhoffs are correct that we have long rejected reliance on “arbitrary” rules when 

construing unambiguous contractual language. See id. And more recently, particularly in our 

decisions addressing mineral-interest conveyances, we have “incrementally cast off rigid, 

mechanical rules” and “warned against quick resort to . . . default or arbitrary rules” in favor of 

determining intent by “conducting a careful and detailed examination of a deed in its entirety, 

14 See also Sharp, 252 S.W.2d at 154 (“A reservation of minerals to be effective must be by clear language. 

Courts do not favor reservations by implication.”).

15 See also Stewman Ranch, Inc. v. Double M. Ranch, Ltd., 192 S.W.3d 808, 811 (Tex. App.—Eastland 2006, 

pet. denied) (“These canons, however, do not apply when the deed is unambiguous.”).
10

rather than applying some default rule that appears nowhere in the deed’s text.” Wenske, 521 

S.W.3d at 792; see Hysaw, 483 S.W.3d at 4 (rejecting reliance on “bright-line rules of 

interpretation that are arbitrary and, thus, inimical to an intent-focused inquiry”); Luckel, 819 

S.W.2d at 462 (rejecting reliance on “technicalities, or arbitrary rules”) (quoting Sun Oil, 84 

S.W.2d at 444). Relying on “default rules or other mechanical rules of construction to determine 

the deed’s meaning is, therefore, both unnecessary and improper.” Wenske, 521 S.W.3d at 796.

On the other hand, we have also recognized, even quite recently, that we must rely on 

“well-settled contract-construction principles” to determine whether a contract is ambiguous and 

to interpret the contract if it is not. URI, 543 S.W.3d at 763; see Coker, 650 S.W.2d at 394 (applying 

“the rules of construction” to “ascertain the true intention of the parties”). Indeed, our statement in 

Citizens National Bank—that courts “do not resort to arbitrary rules of construction where the 

intention of the parties is clearly expressed in unambiguous language”—was just the first of several 

“rules of construction” we listed and applied to determine the meaning of the contract at issue in 

that case. Citizens Nat’l Bank, 150 S.W.2d at 1006–07.

We have not yet endeavored to clearly distinguish between the “arbitrary,” “mechanical,” 

“default” rules we have “cast off” and the “well-settled contract-construction principles” on which 

we continue to rely when construing deeds and other contracts. The former category has included 

a “default rule” requiring a royalty interest to “be carved proportionately from the two mineral 

ownerships,” Wenske, 521 S.W.3d at 795 (discussing and quoting Pitch v. Lankford, 302 S.W.2d 

645, 650 (Tex. 1957)), “a mechanical approach requiring rote multiplication of double fractions 

whenever they exist,” Hysaw, 483 S.W.3d at 4, and a rule giving certain clauses—like a “granting” 
11

clause, “warranty” clause, or “habendum” clause—absolute priority over other clauses, Luckel, 

819 S.W.2d at 462–63. By contrast, the latter category has included the rule requiring that courts 

construe language according to its “plain, ordinary, and generally accepted meaning” unless the 

instrument directs otherwise, URI, 543 S.W.3d at 764 (quoting Heritage Res., Inc. v. NationsBank, 

939 S.W.2d 118, 121 (Tex. 1996)), the rule requiring that courts construe words “in the context in 

which they are used,” id., the rule requiring that courts avoid any construction that renders any 

provisions meaningless, Coker, 650 S.W.2d at 394, and the rule requiring courts to consider and 

construe all of a contract’s provisions together “so that the effect or meaning of one part on any 

other part may be determined,” Citizens Nat’l Bank, 150 S.W.2d at 1006. We assume Piranha 

would contend that the construction rules on which it relies fall within the latter category of reliable 

contract-construction principles, while the Neuhoffs would contend that they fall into the former 

category of arbitrary, mechanical, or default rules. We need not draw that distinction here, 

however, because even if we consider the rules Piranha urges, they do not support the outcome it 

requests. 

The first rule Piranha cites favors construing a deed to convey not the greatest estate 

possible, but the greatest estate “permissible under its language.” Garrett, 299 S.W.2d at 906; see 

also Waters, 312 S.W.2d at 234 (favoring construction that conveys “the greatest estate that the 

terms of the instrument will permit”). Piranha repeatedly asserts that the Assignment’s granting 

clause conveys “all of [Neuhoff Oil’s] right, title, and interest” in and to its overriding royalty 

interest under the Puryear Lease. But that’s not what the clause says. Instead, it says that Neuhoff 

Oil conveys “all” of its “right, title, and interest in and to the properties described in Exhibit ‘A’.” 
12

Under Piranha’s first construction rule, we must still determine whether the language of Exhibit 

A, construed in context with the entirety of the Assignment’s provisions, could permit the 

determination that it conveys “all” of Neuhoff Oil’s interest in all of its overriding royalty under 

the Puryear Lease.

According to Piranha, the second rule on which it relies requires courts to reject any alleged 

“exception, reservation, or limitation” that is not expressly and clearly stated in the deed. Actually, 

we have said that any “reservation” must be “by clear language” and cannot be implied, and a 

reservation is a form of “exception” through which the grantor excludes for itself a portion of that 

which would otherwise fall within the deed’s description of the interest granted. Perryman, 546 

S.W.3d at 119; Sharp, 252 S.W.2d at 154; see also King v. First Nat’l Bank of Wichita Falls, 192 

S.W.2d 260, 262 (Tex. 1946) (explaining that reservations and exceptions both describe 

“something to be deducted from the thing granted, narrowing and limiting what would otherwise 

pass by the general words of the grant”). This rule does not address language that describes the 

interest granted, but language that excludes from the grant a portion of the interest described.

16

Although overriding royalty interests are usually created by a reservation,17 the dispute here 

16 As Piranha notes, we have refused to impose a “limitation” on the duration of a mineral lease by implication 

or in the absence of clear and precise language. See Rogers v. Ricane Enters., Inc., 884 S.W.2d 763, 767 (Tex. 1994). 

Relying on Rogers, Piranha urges us to impose the same restriction on any attempt to “limit” the “areal extent” of 

Neuhoff Oil’s assignment of its overriding royalty interest. But the assignment at issue in Rogers clearly described 

the interest being assigned and contained no “language limiting the duration of the assignment.” Id. The issue there 

was whether to imply a limitation on the duration of the interest clearly assigned; here, the issue is what interest was 

assigned.

17 See John K.H. Akers, Jr., Overriding Royalty Interests: Pitfalls, Precedent, and Protection, 50 ROCKY 

MTN. MIN. L. INST. 21-1, § 21.01[1] (2004) (“An overriding royalty interest . . . can be created through a conveyance, 

but it is more commonly created by a reservation in the assignment or transfer of an oil and gas lease.”).
13

involves language conveying an interest rather than reserving an interest or excepting it from a

conveyance.

18

Piranha ignores that distinction, asserting that any grantor who seeks “to withhold from a 

conveyance any part of its estate for itself must express that intention as a reservation or exception 

in order to reduce the estate conveyed.” But that assertion ignores “the difference between a deed 

that conveys only a partial interest and a deed that conveys an entire interest but reserves a part of 

that interest.” Wenske, 521 S.W.3d at 806 (BOYD, J., dissenting). A grantor may withhold for itself 

a part of its estate either by granting the entire estate but reserving the portion it desires to retain 

or by granting only the portion it desires to convey. See, e.g., Harris v. Currie, 176 S.W.2d 302,

304–05 (Tex. 1943) (explaining that a landowner may sever the mineral estate from the surface 

estate “either by the conveyance of the minerals alone or by the conveyance of the land with a 

reservation of the minerals”). Here, as Piranha itself agrees, the Assignment contains no language 

attempting to reserve or except anything from the interest granted, so rules governing the 

construction of exceptions or reservations could not apply. We must determine the interest Neuhoff 

Oil granted, not the interest it excepted or reserved.

Finally, Piranha relies on the rule that “should there be any doubt as to the proper 

construction of the deed, that doubt should be resolved against the grantors, whose language it 

is.” Garrett, 299 S.W.2d at 906. This rule applies, however, only when our “doubt” about the 

18 The previous assignment in 1978 created the overriding royalty interest by reservation, stating that Neuhoff 

Oil assigned its mineral interest “SUBJECT, HOWEVER, to the Landowners’ Three-Sixteenths (3/16th) Royalty 

Interest provided for the Lessors in said Leases and the One-sixteenth (1/16th) Overriding Royalty Interest reserved 

and retained by [Neuhoff Oil] in and to said Leases and Lands.” Neither party argues that the 1978 assignment was in 

any way defective.
14

document’s meaning renders the language ambiguous. See Lopez v. Munoz, Hockema & Reed, 

L.L.P., 22 S.W.3d 857, 860 (Tex. 2000) (noting that rule requiring construction against the 

document’s drafter applies only “when we construe ambiguous contracts or contracts that are 

reasonably susceptible to more than one interpretation”); see also RSUI Indem. Co. v. The Lynd 

Co., 466 S.W.3d 113, 118 (Tex. 2015) (requiring ambiguity before construing insurance policy 

against insurer). We might resort to this rule if we determined that the Assignment is ambiguous, 

but we will not rely on it when determining whether the agreement is ambiguous or when 

construing an unambiguous agreement.

Surrounding Circumstances

While Piranha relies primarily on rules of construction, the Neuhoffs rely primarily on 

evidence regarding the circumstances surrounding the Assignment to support their position that 

Neuhoff Oil conveyed only its overriding royalties on production from Section 28’s northwest 

quarter. In particular, the Neuhoffs rely on evidence regarding the auction process through which 

the sale occurred, consisting primarily of various documents that governed that process.

We agree with the Neuhoffs that “objectively determinable facts and circumstances that 

contextualize the parties’ transaction” may help clarify the parties’ intent as expressed in the text 

of their written agreement. URI, 543 S.W.3d at 757–58. The parol evidence rule prohibits us from 

relying on such evidence to “create ambiguity in the contract’s text,” Cmty. Health Sys. Prof’l 

Servs. Corp. v. Hansen, 525 S.W.3d 671, 688 (Tex. 2017), to “augment, alter, or contradict the 

terms of an unambiguous contract,” URI, 543 S.W.3d at 757–58, to “show that the parties probably 

meant, or could have meant, something other than what their agreement stated,” Anglo-Dutch 
15

Petroleum Int’l, Inc. v. Greenberg Peden, P.C., 352 S.W.3d 445, 451 (Tex. 2011), or to “make the 

language say what it unambiguously does not say,” Brumitt, 519 S.W.3d at 110. But evidence of 

surrounding circumstances may “aid the understanding of an unambiguous contract’s language,” 

“inform the meaning” of the language actually used, and “provide context that elucidates the 

meaning of the words employed.” URI, 543 S.W.3d at 757–59.19 Here, however, the surrounding 

circumstances do not support either party’s proposed construction of the Assignment.

The evidence establishes that Piranha purchased Neuhoff Oil’s interest through an oil-andgas clearinghouse auction involving some 1,200 separate interests in properties located in fourteen 

different states. The process did not involve any negotiations between the parties, and—as was the 

case here—the winning bidders typically acquired the interests as-is, where-is, and without any 

warranty or covenant of title. 

A seller who desired to offer an interest for sale at the auction was first required to enter 

into a written agreement with the auction house. In this agreement, Neuhoff Oil agreed to “use 

reasonable efforts to accurately and completely describe the Properties and all working, net 

revenue, overriding royalty and other interests of Seller therein,” on an exhibit attached to the 

agreement, on “all property data sheets,” and on “the conveyancing instruments delivered to Buyer 

at the Sale.” It further agreed to “provide any additional information which prospective bidders 

may reasonably request for the purpose of verifying the accuracy and completeness of the 

information concerning the Properties” and to “use reasonable efforts to respond to reasonable 

19 See also Murphy Expl., 560 S.W.3d at 109–10; Brumitt, 519 S.W.3d at 109; N. Shore Energy, 501 S.W.3d 

at 602; The Hous. Expl. Co. v. Wellington Underwriting Agencies, Ltd., 352 S.W.3d 462, 469 (Tex. 2011).
16

questions from prospective bidders concerning the Properties.” And it also agreed that it had “not 

fractionalized its interest in the Properties, but rather [was] selling all of its interest in same,” and 

was “representing all its interests in the Properties as available for sale.” In the exhibit attached to 

this agreement, Neuhoff Oil provided a list of twenty-two different interests it wanted to sell, 

identifying each by state and county, the name of a well, and an estimated value. For the interest 

at issue here, Neuhoff Oil identified the “Puryear #1-28” well in Wheeler County, Texas, with an 

estimated value of $15,000. 

Just as Neuhoff Oil had to enter an agreement with the auction house, Piranha had to 

register as a qualified bidder and make certain written representations and acknowledgements to 

both the auction house and the seller. Among other things, Piranha represented that it was a 

sophisticated buyer of oil and gas properties and interests, that it received all documents and 

information it reasonably required to evaluate the properties it was interested in buying, that it 

performed its own due diligence on those properties, that it performed “all tasks necessary to 

evaluate a property to [its] complete satisfaction,” and that it reviewed the proposed Assignment 

agreement, understood its terms, and understood that those terms would prevail in the event of any 

conflict. 

To advertise the sale, the auction house published a Sale Brochure and an Auction Catalog 

identifying the interests to be offered. For each interest, the Sale Brochure listed a data order 

number, a well name, a location, the county and state, information about the mineral interests, the 

operator, the seller, and various interest-specific “remarks.” The Sale Brochure identified the 

interest at issue here as data order number 49033, the Puryear B #1-28 well, in N. Mills Ranch, 
17

Wheeler County, TX, a .0375 overriding royalty interest, with Startex Operating as the operator 

and Neuhoff Oil as the seller. Similarly, the Auction Catalog listed the interest by identifying the 

well (“Puryear B 1-28”), N. Mills Ranch, Wheeler County, TX, the .0375 overriding royalty 

interest, the operator (Startex) and the seller (Neuhoff Oil). 

In addition to these pre-auction descriptions, the auction house required Neuhoff Oil to 

complete a Property Data Sheet for interested bidders to review. For the interest at issue here, 

Neuhoff Oil completed the form by filling in relevant blanks as follows:

Property Number: 

Well Name: Puryear “B” #1-28 

Field Name: N. Mills Ranch 

Operator Name: Startex Operating Co.

Company Group No.: 

Seller: Neuhoff Oil & Gas Corp.

State: TX

County: Wheeler

Description: NW1/4 Sect. 28, BLK A-3, H&GN

Well Status: Producing As Of: 4/99 

Decimal Interest Offered For Sale (Current):

WI [Working Interest]: NA

NRI [Net Revenue Interest]: NA

ORRI [Overriding Royalty Interest]: .0375

Associated Leasehold:

Fed Lse ___ State Lse ___ BIA Lse ___ Fee Lse X

Total Depth Drilled: 20,250’

Completion Date: 12/89

Finally, upon completion of the sale, the auction house provided a Detail Invoice 

identifying Piranha as the buyer and describing the interest by listing the Puryear B #1-28 well, 

Wheeler County, TX, the .0375 overriding royalty interest, and the seller and operator. 
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The Neuhoffs contend that these documents inform the meaning of the Assignment by 

confirming that Neuhoff Oil conveyed only its overriding royalty interest in production from 

Section 28’s northwest quarter. They note that the Sale Agreement, the Sale Brochure, and the 

Auction Catalog identified the interest by referring only to the Puryear B #1-28 well, and the 

Property Data Sheet and Detail Invoice referred only to the well and to Section 28’s northwest 

quarter. Consistent with the argument they originally made in the trial court, they argue that under 

the Sale Agreement, the auction house only had authority to sell Neuhoff Oil’s overriding royalty 

interest in production from the Puryear B #1-28 well. They now accept the court of appeals’ 

holding that Piranha purchased the overriding royalty interest in production from any well in 

Section 28’s northwest quarter, but they insist that none of these documents “even hint that the 

overriding royalty interest would include production from all of section 28.” 

Piranha contends that, consistent with the auction process, the documents referred to the 

Puryear B #1-28 well merely as a shorthand label for the interest offered, because it was the only 

producing well on the entire Puryear Lease and the only source of any overriding royalty payments 

at that time. It asserts that the auction documents typically described leasehold interests by using 

the name of a producing well on the lease, even when the interest included more than just that 

derived from the named well. It claims that when a seller intended to limit the interest to the named 

well, it added “WBO” (for “wellbore only”) as a remark in the Sale Brochure—a designation that 

never appears in any of the descriptions of the interest at issue here. It insists that nothing in any 

of the documents indicates that Neuhoff Oil was offering anything less than its entire overriding 

royalty interest under the Puryear Lease, and it particularly relies on Neuhoff Oil’s agreement that 
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it had “not fractionalized its interest in the Properties, but rather [was] selling all of its interest in 

same.” And finally, it asserts that the Property Data Sheet referred to the “Associated Leasehold” 

(designated as “Fee Lse”), indicating that Neuhoff Oil was selling all of its 3.75% overriding 

royalty interest in all production under the Puryear Lease.

The Neuhoffs reply with several points. They say Piranha cannot rely on the Sale 

Agreement between Neuhoff Oil and the auction house because there’s no evidence Piranha ever 

saw that document. They note that although Neuhoff Oil confirmed in that agreement that it had 

not “fractionalized” its interest, it referred specifically to its interest “in the Properties,” meaning 

the specific interest the documents identified as the overriding royalty interest in the Puryear B #1-

28 well, not in all of Section 28. They contend that nothing in the documents supports Piranha’s 

assertion that some listings that did not contain the WBO designation were identified by a well’s 

name even though they involved an interest in the entire lease.

We conclude that these documents fail to provide any meaningful support for either party’s 

construction of the written Assignment. Whether treated as evidence of surrounding circumstances 

or as writings associated with the Assignment, all of these documents expressly prohibited the role 

the parties would now give them. The Sale Brochure, for example, included a “NOTE” at the 

bottom of every other page (including the page on which the interest at issue here is listed), 

providing that “Wellbore Only, Depth Limitations and other restrictions are not always represented 

in this publication,” and parties must look to “the Data Package and Conveyance Documents for a 

complete representation of any restrictions associated with each property offered.” Similarly, the 

Auction Catalog stated at the bottom of every page on which interests were listed that, “This 
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catalog is provided for convenience purposes only. All information is provided without warranty 

as to accuracy or completeness. Bidders should verify all information and the condition of 

properties being sold prior to bidding.” And the Property Data Sheet included a disclaimer 

providing, “DUE DILIGENCE AND VERIFICATION BY BUYER IS REQUIRED – The 

information contained above is provided without warranty or guarantee by Seller or [the auction 

house] as to accuracy, completeness or otherwise.” In short, each of these documents disclaimed 

any of the reliance the parties now place on them, and instead required the parties to look solely to 

the Assignment to determine the interest sold. We, therefore, will do the same.

The Entirety of the Assignment

Setting aside inapplicable rules of construction and unhelpful surrounding circumstances, 

we return now to the Assignment. As mentioned, the Assignment’s granting clause conveyed “all 

of [Neuhoff Oil’s] right, title, and interest in and to the properties described in Exhibit ‘A’ (the 

Properties).” And the relevant page of Exhibit A identifies the well (the Puryear B #1-28), the land 

(NW4, Section 28), and the lease (the Puryear lease), without identifying which of the three defines 

the scope of the overriding royalty assigned. Standing alone, Exhibit A is at least ambiguous, if 

not completely unenforceable, because it fails to adequately identify the interest assigned, a term 

that is obviously essential and material to the parties’ agreement. See Fischer v. CTMI, L.L.C., 479 

S.W.3d 231, 237 (Tex. 2016) (“To be enforceable, a contract must address all of its essential and 

material terms with ‘a reasonable degree of certainty and definiteness.’”) (quoting Pace Corp. v. 

Jackson, 284 S.W.2d 340, 345 (Tex. 1955)).
21

But our “holistic and harmonizing approach” to construing deeds and similar documents 

requires us to consider all of the Assignment’s provisions and prohibits us from giving greater 

weight to the granting clause or to any other particular types of clauses. Wenske, 521 S.W.3d at 

794 (citing Luckel, 819 S.W.2d at 462–64). Here, the Assignment’s other provisions 

unambiguously express an objective intent to convey Neuhoff Oil’s overriding royalty interest in 

the Puryear Lease, covering all of Section 28.20 Four provisions in particular demonstrate this 

intent.21

First, as mentioned, Section I of the Assignment includes two numbered paragraphs 

immediately following the granting clause. Paragraph 1, as we have explained, begins by 

describing “All oil and gas leases, mineral fee properties or other interests, INSOFAR AND ONLY 

INSOFAR AS set out in Exhibit A . . . whether said interest consists of leasehold interest, 

overriding royalty interest, or both . . . .” This clause points us to Exhibit A to determine the interest 

conveyed, but the rest of the sentence provides, “which [interest] shall include any working 

interest, leasehold rights, overriding royalty interests and reversionary rights held by [Neuhoff 

20 The Dissent challenges our consideration of these provisions, arguing that because “the ‘interests’ 

conveyed are expressly limited to Exhibit A—in all caps no less,” these provisions “do not amplify the description in 

Exhibit A,” because the interest conveyed “must be described in Exhibit A.” Post at ___ & n.13. But the lease is 

described in Exhibit A. Our purpose for considering other provisions, which constitute the textual context of Exhibit 

A, is not to expand or add to the grant or to identify some independent description of the interest assigned, but to 

determine what Exhibit A means by its description of the Puryear Lease. If, for example, Exhibit A identified only the 

well and the land but not the lease, we could not rely on other provisions to conclude that the Assignment actually 

conveys all interests under the lease. But Exhibit A identifies the lease, the land, and the well. In our effort to interpret 

the intent thus expressed in Exhibit A, our holistic and harmonizing approach requires us to consider all of the 

Assignment’s provisions to determine Exhibit A’s meaning. See Wenske, 521 S.W.3d at 794.

21 The Dissent labels these provisions as “unrelated,” without explaining why they are “unrelated” or what 

they are “unrelated” to. Post at ___. Because they constitute the Assignment’s express terms, of course, they are 

directly related to the parties’ agreement; and to the extent they shed light on Exhibit A’s meaning, they are directly 

related to Exhibit A’s identification of the interest assigned.
22

Oil], as of the Effective Date.” [Emphasis added.] The parties agree that Neuhoff Oil did not hold 

any working interest, leasehold right, or reversionary right in the well, the land, or the lease 

described in Exhibit A, but it did hold an overriding royalty interest in the entire lease, which 

included the well and the land described. So although the paragraph limits the interest to that 

described in Exhibit A, that same sentence explains that the interest described in Exhibit A 

“include[s] any” overriding royalty interest then held by Neuhoff Oil. Giving effect as we must to 

all of its language, Paragraph 1 does not just incorporate Exhibit A, it explains that the interest 

described in Exhibit A includes any overriding royalty interest Neuhoff Oil then owned, to the 

extent Exhibit A identifies those interests. See Perryman, 546 S.W.3d at 123 (discussing 

conveyances and exceptions of interests “now owned by grantor”).

Second, Paragraph 2 of Section I then confirms that the conveyance included:

All presently existing contracts to the extent they are assignable 

and to the extent they affect the Leases, including agreements 

for the sale or purchase of oil, gas and associated hydrocarbons, 

division orders, unit agreements, operating agreements, and all 

other contracts and agreements arising from, connected with, or 

attributable to the production therefrom.

By conveying existing contracts to the extent they affect “the Leases,” as opposed to just the well 

or the land, this paragraph further indicates that Neuhoff Oil conveyed its entire interest under the

Puryear Lease. If the conveyance included only Neuhoff Oil’s royalty interest in production from 

the Puryear B #1-28 or from Section 28’s northwest quarter, there would have been no reason to 

convey all contracts that affect the Puryear Lease.
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Finally, the Assignment’s Section II contains five numbered paragraphs setting forth 

specific details about the conveyance. Paragraph 1 of Section II states that the “overriding royalty 

interest(s) herein assigned, if any, are payable out of and only out of the oil and gas produced, 

saved and marketed pursuant to the terms and provisions of the oil and gas leases described in 

EXHIBIT A.” [Emphasis added.] And Paragraph 3 of that section provides that if “[Neuhoff Oil’s] 

interest(s) in the oil and gas lease(s) described in EXHIBIT A is less than the entire interest, or if 

said oil and gas lease(s) cover less than the entire fee title, then the interest(s) assigned herein shall 

be reduced proportionately.” These paragraphs point directly to the leases described in Exhibit A

and confirm that the interest assigned was the interest payable from the production under the 

Puryear Lease (the lease described in Exhibit A), limited to the 3.75% overriding royalty interest 

Neuhoff Oil actually owned.

The Neuhoffs argue that this construction improperly renders the “Lands and Associated 

Well(s)” section of Exhibit A meaningless and superfluous. See Coker, 650 S.W.2d at 394 (“Courts 

must favor an interpretation that affords some consequence to each part of the instrument so that 

none of the provisions will be rendered meaningless.”). According to them, Exhibit A’s references 

to the Puryear B #1-28 and to Section 28’s northwest quarter have no meaning at all unless they 

limit the conveyance to the overriding royalties on oil and gas produced from that well or that 

portion of Section 28.22 In fact, they assert, if the Assignment conveyed the overriding royalty on 

22 The Dissent agrees, asserting that our construction is “problematic” because it renders the “geographic 

identification” in Exhibit A “unnecessary,” post at ___, and “superfluous,” post at ___. Of course, the same would be 

true for any alternative construction, whether made by a court as a matter of law (as the Neuhoffs propose) or by a 

jury as a matter of fact (as the Dissent proposes). Under their analysis, construing Exhibit A to limit the assignment 

to Neuhoff Oil’s interest in oil and gas produced from the well identified in Exhibit A would make Exhibit A’s 
24

all production under the lease, then the Lands and Associated Well(s) section “would be worse 

than surplusage—it would directly conflict with the ‘Lease(s)’ section.” We disagree. As we read 

Exhibit A, in harmony with the Assignment’s provisions discussed above, we agree with Piranha 

that the Lands and Associated Well(s) section simply identifies the only location on Section 28 

and the only well from which oil and gas giving rise to overriding royalties was then being 

produced. See Paradigm Oil, 372 S.W.3d at 180 n.1 (noting that the value of an overriding royalty 

interest is determined through production at the surface). By providing this information, Exhibit 

A more clearly identified the Puryear Lease under which the overriding royalty existed. 

Construing the Assignment in its entirety and harmonizing all of its provisions, the only 

reasonable construction is that Neuhoff Oil conveyed its 3.75% overriding royalty interest in all 

production under the Puryear Lease. We thus conclude that the Assignment unambiguously 

conveyed to Piranha all of that interest that Neuhoff Oil owned at the time of the conveyance.

III.

Conclusion

We reverse the court of appeals’ judgment holding that the Assignment conveyed only the 

3.75% overriding royalty interest in production from Section 28’s northwest corner, and we 

reinstate the trial court’s summary judgment declaring that the Assignment conveyed to Piranha 

all of Neuhoff Oil’s 3.75% overriding royalty interest in production under the Puryear Lease, 

covering all of Section 28.

references to the land and the lease unnecessary and superfluous, while construing it to limit the assignment to the 

interest in oil and gas produced from the land would make the references to the well and the lease unnecessary and 

superfluous. Under their approach, any of the three possible constructions would be impermissible.
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_____________________

Jeffrey S. Boyd

Justice

Opinion delivered: February 21, 2020