SYLVIA GN 1970 A DIRECTORY OF THE MINING INDUSTRY OF UTAH1967 UTAH GEOL AND MINERAL SURVEY BULL 84 P 31STOWE CH 1973 UTAH MINERAL INDUSTRY OPERATOR DIRECTORY UTAHGEOL AND MINERAL SURVEY BULL 101 P 49BULLOCK KC 1966 MINERALS OF UTAH UTAH GEOL AND MINERALSURVEY BULL 76 P 36BOUTWELL JM 1912 GEOLOGY AND ORE DEPOSITS OF PARK CITYDISTRICT UTAH USGS PROF PAPER 77 230 P