Code of Federal Regulations Title 43. Public Lands:  Interior § 43.3154.3 Bond cancellation or termination of liability

The authorized officer shall not consent to the cancellation of the bond or the termination of liability unless and until the terms and conditions of the notice of intent or permit have been met. Should the authorized officer fail to notify the party within 90 days of the filing of a notice of completion of the need for additional action by the operator to rehabilitate the lands, liability for that particular exploration operation shall automatically terminate.