Sentence:  The Secretary of the Interior shall submit a report of his findings , together with recommendations for an effective <WSD>safety</WSD> program for metal and nonmetallic mines ( excluding coal and lignite mines ) based upon such findings , to the Congress not more than two years after the date of enactment of this Act . 
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