The Texas Supreme Court in Concho Resources, Inc. v. Ellison enforced a boundary stipulation involving an unambiguous deed about which there had been no dispute. You can refer to our earlier post to understand the More facts The Boundary Stipulation of Ownership of Mineral Interests between the owners of the Northwest Tract and Southeast Tract mineral estates declared the boundary of the mineral estate to be different from the public road and was recorded in the Irion County public records. In 2008 Sampson sent a letter to Ellison, operator of leases on one tract, enclosing the stipulation and requesting that Ellison “signify your acceptance of the description of the [Northwest Tract] as set out in the Stipulation… [.]” Ellison signed and several wells were drilled. His wife Marsha succeded to his interest after his death and sued alleging trespass to try title and other claims.