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16. Oak Hill – Luminant 17. Three Oaks – Alcoa 18. Twin Oak – Luminant 19. Kosse – Luminant 20. Leesburg – Luminant Based on a map of the Railroad Commission of Texas. Areas of Geologic Conditions Relating to Occurrence of Coal Areas of Geologic Conditions Relating to Occurrence of Lignite 6 Permitted Coal Mine [R] Reclamation Only ...