Tex. Nat. Res. Code § 131.204
Liability under the bond shall be for the duration of surface mining and reclamation operations and for a period coincident with the operator's responsibility pursuant to Section 131.102 of this code.
Acts 1977, 65th Leg., p. 2627, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977.