; (2) evaluate the bids in such sale and issue leases resulting from such sale, within 90 days after the date of the completion of such sale; and (3) conduct additional sales so long as sufficient interest in development exists to warrant, in the Secretary’s judgment, the conduct of such sales. 5. Grant of leases by the Secretary (a) In General The Secretary may grant to the highest responsible qualified bidder in a lease sale conducted pursuant to section 4 any lands to be leased on the Coastal Plain upon payment by the lessee of such bonus as may be accepted by the Secretary. (b) Subsequent Transfers No lease issued under this Act may be sold, exchanged, assigned, sublet, or otherwise transferred except with the approval of the Secretary. Prior to any such approval the Secretary shall consult with, and give due consideration to the views of, the Attorney General. 6. Lease terms and conditions (a) In General An oil or gas lease issued pursuant to this Act shall— (1) provide for the payment of a royalty of not less than 12 ½ percent in amount or value of the production removed or sold from the lease, as determined by the Secretary under the regulations applicable to other Federal oil and gas leases; (2) provide that the Secretary may close, on a seasonal basis, portions of the Coastal Plain to exploratory drilling activities as necessary to protect caribou calving areas and other species of fish and wildlife; (3) require that the lessee of lands within the Coastal Plain shall be fully responsible and liable for the reclamation of lands within the Coastal Plain and any other Federal lands that are adversely affected in connection with exploration, development, production, or transportation activities conducted under the lease and within the Coastal Plain by the lessee or by any of the subcontractors or agents of the lessee