43 CFR § 3214.10
Who must post a geothermal bond?
June 11, 2020
(a) The lessee or operator must post a bond with BLM before exploration, drilling, or utilization operations begin.
(b) Before we approve a lease transfer or recognize a new designated operator, the lessee or operator must file a new bond or a rider to the existing bond, unless all previous operations on the land have already been reclaimed.