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Fourteenth Court Holds 'Mutually Agreed' Seismic Permit Provision Creates Enforceable Condition Precedent with No Duty to Negotiate

Endeavor Natural Gas III, LLC v. Comanche Maverick Ranch Investments, L.P. Texas Court of Appeals, Fourteenth District 14-24-00639-CV resolved
By Joel Reese · July 20, 2026 Texas Court of Appeals, Fourteenth District

The Fourteenth Court of Appeals affirmed summary judgment for a south Texas landowner, holding that a surface use agreement provision requiring Endeavor Natural Gas to obtain a "mutually agreed-upon seismic surface use permit" before conducting geophysical operations was an enforceable condition precedent. The court rejected Endeavor's arguments that the provision was an unenforceable agreement to agree or that Comanche's refusal to negotiate excused performance.

Surface Damage Texas Court of Appeals Surface Use Agreement Condition Precedent Seismic Operations

Background and Contractual Framework

Comanche Maverick Ranch Investments, L.P., a landowner using its south Texas property primarily for wildlife management, leased 300 mineral acres to Endeavor Natural Gas III, LLC for oil and gas exploration and production. The parties executed both an 18-page mineral lease and a comprehensive 29-page surface use agreement. Within the surface use agreement, a critical provision—termed the "seismic provision" by the court—stated that Endeavor "shall have the right to conduct geophysical operations on the Land, including but not limited to two dimensional or three dimensional geophysical surveys, only after first entering into a mutually agreed-upon seismic surface use permit with [Comanche]." When Endeavor's counsel requested good faith discussions for such a permit, Comanche's counsel responded that the provision was unenforceable and that Comanche had "no obligation" to enter into any seismic permit. Endeavor nonetheless notified Comanche of its intent to commence seismic operations, triggering competing summary judgment motions for declaratory relief.

The Trial Court's Ruling

The trial court denied Endeavor's summary judgment motion and granted Comanche's motion, declaring that: (1) Endeavor is not entitled to conduct seismic operations without a seismic permit granted by Comanche; (2) Endeavor does not have a seismic permit from Comanche; (3) Comanche is not required to issue a seismic permit to Endeavor; and (4) Endeavor does not have the right to conduct seismic operations on Comanche's surface estate. Endeavor timely appealed.

Endeavor's Arguments on Appeal

On appeal, Endeavor asserted that the seismic provision is an unenforceable agreement to agree, not a condition precedent. Alternatively, Endeavor argued that even if the provision constituted a valid condition precedent, compliance was excused by Comanche's refusal to negotiate. The Fourteenth Court of Appeals reviewed the summary judgments de novo, noting that when a trial court considers competing summary judgment motions and grants one while denying the other, the appellate court considers the evidence presented by both sides, determines all questions presented, and renders the judgment the trial court should have rendered.

The Court's Analysis

The court ruled that the seismic provision was a valid condition precedent that had not been met. The opinion notes that it is undisputed that the parties did not mutually agree to a permit. Both parties argued that the seismic use permit provision was unambiguous, though the provided opinion text ends before the court's complete analysis is presented. The Fourteenth Court of Appeals affirmed the trial court's judgment in favor of Comanche.