Sec. 306. Strategic and Critical Materials. The Secretary of Defense, and the Secretary of the Interior in consultation with the Secretary of Defense as the National Defense Stockpile Manager, are each delegated the authority of the President under section 303(a)(1)(B) of the Act, 50 U.S.C. App. 2093(a)(1)(B), to encourage the exploration, development, and mining of strategic and critical materials and other materials.