; or (B) the lessee or the lessee’s affiliate sells the coal to a person under a non-arm’s-length contract who then sells the coal under an arm’s-length contract. (2) Definition of arm’s-length contract In this subsection, the term arm’s-length contract means a contract or agreement between independent persons who are not affiliates and who have opposing economic interests regarding that contract. . (b) Study The Secretary of the Interior shall enter into an agreement with the National Academy of Sciences to conduct a study to determine the most equitable method for valuation of coal produced on Federal lands for purposes of Federal coal leases. 604. Methane recovery Section 2 of the Mineral Leasing Act ( 30 U.S.C. 201 ) is amended— (1) in subsection (a)(1), by inserting and subject to subsection (e)(6), after deems appropriate,