(a) Exploration licenses may be issued for:

(1) Lands administered by the Secretary that are subject to leasing, §3400.2;

(2) Lands administered by the Secretary of Agriculture through the Forest Service or other agency that are subject to leasing, §3400.2;

(3) Lands which have been conveyed by the United States subject to a reservation to the United States of the mineral or coal deposits, to the extent that those deposits are subject to leasing under §3400.2; and

(4) Acquired lands set apart for military or naval purposes.

(b) No exploration license shall be issued for lands included in an existing coal lease.