(a) The lessee or preference right lease applicant wishing to negotiate an exchange shall so reply in writing. The reply may include a description of the lands on which the lessee or lease applicant would accept an exchange lease or coal lease modification.

(b) A reply to the exchange notice by a lessee or preference right lease applicant indicating willingness to enter into an exchange shall also indicate willingness to provide the geologic and economic data needed by the Secretary to determine the fair market value of the lease or lease application to be relinquished. The lessee or preference right lease applicant shall also indicate willingness to provide any geologic and economic data in his possession that will help the Secretary to determine the fair market value of the potential Federal lease exchange tract or tracts.