If an ad valorem Federal coal lease is developed by in-situ or surface gasification or liquefaction technology, the lessee shall propose the value of coal for royalty purposes to ONRR. The ONRR will review the lessee's proposal and issue a value determination. The lessee may use its proposed value until ONRR issues a value determination. [54 FR 1523, Jan. 13, 1989, as amended at 65 FR 43289, Aug. 10, 1999]