30 CFR § 556.1100
How does a lease expire?
July 29, 2020
(a) Your oil and gas lease will automatically expire at the end of its primary term unless you have taken action, as set forth in §556.601, to maintain the lease beyond the primary term.
(b) Your sulfur lease will automatically expire at the end of its primary term unless you have taken action, as set forth in §556.603, to maintain the lease beyond the primary term.