Section 3483.1 - Diligent development and continued operation requirement(a)General requirements.(1) Except as provided at paragraph (b) of this section, each Federal coal lease and LMU is required to achieve diligent development.(2) Once the operator/lessee of a Federal coal lease or LMU has achieved diligent development, the operator/lessee shall maintain continued operation on the Federal lease or LMU for every continued operation year thereafter, except as provided in § 3483.3 of this title.(b) Federal coal leases issued prior to August 4, 1976, until the first readjustment of the lease after August 4, 1976, shall be subject to the Federal lease terms, including those that describe the minimum production requirement, except that:(1) An operator/lessee holding such a lease may elect to be subject to the rules of this part by notifying the authorized officer in writing prior to August 30, 1983.(i) Such election shall consist of a written request, in triplicate, to the authorized officer that a Federal lease(s) be subject to the rules of this part, and shall contain the following-(A) Name and address of the operator/lessee of record.(B) Federal lease number(s).(C) Certified record of annual Federal coal production since August 4, 1976, for the Federal lease(s) that the operator/lessee requests to have credited toward diligent development in accordance with § 3483.5 of this title.(ii) Upon verification by the authorized officer of the reported annual Federal coal production, the authorized officer shall notify the operator/lessee by certified mail, return receipt requested, that the election has been approved. The effective date of the election shall be the most recent royalty reporting period prior to the submittal of the election to the authorized officer.(2) Upon the effective date of the first lease readjustment after August 4, 1976, all such Federal leases shall be subject to the rules of this part.(c) Any Federal coal lease included in an LMU shall be subject to the diligent development and continued operation requirements imposed on the LMU in lieu of those diligent development and continued operation requirements that would apply to the Federal lease individually.47 FR 33179, July 30, 1982; 47 FR 53366, Nov. 26, 1982. Redesignated at 48 FR 41589, Sept. 16, 1983