Section 4
SEC. 4. Any person, association, or corporation holding a lease of coal lands under this Act may, with the approval of the Secretary of Agriculture and Natural Resources and through the same procedure and upon the same terms and conditions as in the case of an original lease under this Act, secure a further or new lease covering additional lands contiguous to those embraced in the original lease, but in no event shall the total area embraced in such original and new leases exceed in the aggregate twelve hundred hectares: Provided, That upon satisfactory showing by the lessee that all of the workable deposits of coal within the limits of the land leased will be exhausted or removed within three years thereafter, the Secretary of Agriculture and Natural Resources may, within his discretion, lease to such lessee an additional tract of land or coal deposits, which, including the coal area remaining in the original lease, shall not exceed twelve hundred hectares, through the same procedure and subject to the same requirements as in case of the original lease.