Preference right leases shall be issued for a term of 20 years and for so long thereafter as coal is produced in commercial quantities as defined in §3483.1 of this title. Each lease shall be subject to readjustment at the end of the first 20-year period and at the end of each period of 10 years thereafter in accordance with subpart 3451 of this title.

[44 FR 42628, July 19, 1979. Redesignated and amended at 47 FR 33144, July 30, 1982; 50 FR 8627, Mar. 4, 1985]