The Act of July 23, 1955 (69 Stat. 367, 30 U.S.C. sec. 601), was enacted “to amend the Act of July 31, 1947 (61 Stat. 681) and the mining laws to provide for multiple use of the surface of the same tracts of the public lands, and for other purposes.” The regulations in this part are intended to implement only sections 3 to 7, inclusive, of said Act hereinafter more fully identified. The word “Act” when used in this subpart refers to the Act of July 23, 1955. Sections 1 and 2 thereof relate specifically to the Materials Act of July 31, 1947.