; (2) by inserting mineral materials, including after varieties of ; (3) by striking or cinders and inserting cinders, and clay, ; and (4) by adding at the end the following: (b) (1) Subject to valid existing rights, after the date of the enactment of the Clean Energy Minerals Reform Act of 2023 , notwithstanding the reference to common varieties in subsection (a) and to the exception to such term relating to a deposit of materials with some property giving it distinct and special value, all deposits of mineral materials referred to in such subsection, including the block pumice referred to in such subsection, shall be subject to disposal only under the terms and conditions of the Materials Act of 1947 ( 30 U.S.C. 601–603 ). (2) For purposes of paragraph (1), the term valid existing rights means that a mining claim located for any such mineral material— (A) had and still has some property giving it the distinct and special value referred to in subsection (a), or as the case may be, met the definition of block pumice referred to in such subsection; (B) was properly located and maintained under the general mining laws before the date of the enactment of the Clean Energy Minerals Reform Act of 2023 ; and (C) was supported by a discovery of a valuable mineral deposit within the meaning of the general mining laws as in effect immediately before the date of the enactment of the Clean Energy Minerals Reform Act of 2023 . . (b) Mineral materials disposal clarification Section 4 of the Act of July 23, 1955, commonly known as the Surface Resources Act of 1955 ( 30 U.S.C. 612 ), is amended— (1) in subsection (b), by inserting and mineral material after vegetative