43 CFR §3214.19

1. (a)Except as otherwise provided in this section, if the lands to be transferred to you contain a well or any other surface disturbance which the original lessee did not reclaim, you must post a bond under this subpart before BLM will approve the transfer.
2. (b)If the original lessee does not transfer all interest in the lease to you, you may become a co-principal on the original bond, rather than posting a new bond.
3. (c)You do not need to post an additional bond if:
   1. (1)You previously furnished a statewide or nationwide bond sufficient to cover the lands transferred; or
   2. (2)The operator provided the original bond, and the operator does not change.