Sentence:  the magnitude of effort and costs of each of these possible phases of an effective safety program for <WSD>metal</WSD> and nonmetallic mines ( excluding coal and lignite mines ) ; and the scope and adequacy of State mine safety laws applicable to such mines and the enforcement of such laws . 
Meaning of the word marked with <WSD> tags:  any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.