(a) Approved leases or any interest therein may be assigned or transferred only with the approval of the Secretary. The Indian mineral owner must also consent if approval of the Indian mineral owner is required in the lease. If consent is not required, then the Secretary shall notify the Indian mineral owner of the proposed assignment. To obtain the approval of the Secretary the assignee must be qualified to hold the lease under existing rules and regulations and shall furnish a satisfactory bond conditioned for the faithful performance of the covenants and conditions of the lease.

(b) No lease or interest therein or the use of such lease shall be assigned, sublet, or transferred, directly or indirectly, by working or drilling contract, or otherwise, without the consent of the Secretary.

(c) Assignments of leases, and stipulations modifying the provisions of existing leases, which stipulations are also subject to the approval of the Secretary, shall be filed with the superintendent within five (5) working days after the date of execution. Upon execution of satisfactory bonds by the assignee the Secretary may permit the release of any bonds executed by the assignor. Upon execution of satisfactory bonds the assignee accepts all the assignor's responsibilities and prior obligations and liabilities of the assignor (including but not limited to any underpaid royalties and rentals) under the lease.

(d) Agreements creating overriding royalties or payments out of production shall not be considered as interests in the leases as such provision is used in this section. Agreements creating overriding royalties or payments out of production, or agreements designating operators are hereby authorized and the approval of the Secretary shall not be required with respect thereto, but such agreements shall be subject to the condition that nothing in such agreements shall be construed as modifying any of the obligations of the lessee, including, but not limited to, obligations imposed by requirements of the MMS for reporting, accounting, and auditing; obligations for diligent development and operation, protection against drainage and mining in trespass, compliance with oil and gas, geothermal, and mining regulations (25 CFR part 216; 43 CFR parts 3160, 3260, 3480, and 3590; and those applicable rules found in 30 CFR chapter II, subchapters A and C) and the requirements for Secretarial approval before abandonment of any oil and gas or geothermal well or mining operation. All such obligations are to remain in full force and effect, the same as if free of any such overriding royalties or payments. The existence of agreements creating overriding royalties or payments out of production, whether or not actually paid, shall not be considered as justification for the approval of abandonment of any oil and gas or geothermal well or mining operation. Nothing in this paragraph revokes the requirement for approval of assignments and other instruments which is required in this section, but any overriding royalties or payments out of production created by the provisions of such assignments or instruments shall be subject to the condition stated in this section. Agreements creating overriding royalties or payments out of production, or agreements designating operators shall be filed with the superintendent unless incorporated in assignments or instruments required to be filed pursuant to this section.