Tomas Chapa Yzaguirre, Petitioners v. Kcs Resources, Inc., Respondent

Summary

The Texas Supreme Court affirmed the appellate court, holding that Dallas County was proper venue, that the leases required a market‑value royalty for off‑premises sales regardless of the price received under a long‑term contract, that the implied covenant to reasonably market does not override the express market‑value clause, and that the GPA price was not admissible evidence of market value.