Sentence:  the magnitude of effort and costs of each of these possible phases of an effective <WSD>safety</WSD> program for metal 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:  the state of being certain that adverse effects will not be caused by some agent under defined conditions