(a) Exploration licenses may be issued for:

1. (1) Lands administered by the Secretary that are subject to leasing, § 3400.2;
2. (2) Lands administered by the Secretary of Agriculture through the Forest Service or other agency that are subject to leasing, § 3400.2;
3. (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. (4) Acquired lands set apart for military or naval purposes.