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. 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. [61 FR 5481, Feb. 12, 1996, as amended at 64 FR 43289, Aug. 10, 1999]