Tex. Natural Resources Code § 131.143

(a) After a permit application is approved but before the permit is issued, the applicant shall file a certificate of insurance certifying that the applicant has in force a public liability insurance policy issued by an insurance company authorized to conduct business in this state or, if the applicant is unable to obtain coverage from an insurance carrier authorized to do business in this state, file, with the commission's approval, such a certificate of insurance from a surplus lines insurer that meets the requirements of Chapter 981, Insurance Code, and rules adopted by the commissioner of insurance under that chapter.

(b) The liability insurance policy required by Subsection (a) of this section shall cover all surface mining operations of the applicant in this state and shall afford bodily injury protection and accidental business property damage protection in an amount determined by the commission to compensate adequately any persons damaged as a result of surface mining and reclamation operations.

(c) The liability insurance policy shall be maintained in full force and effect during the term of the permit or the renewal of the permit, including the length of all reclamation operations.