| Reference | {Deposit:: COX, DENNIS P., AND BRIGGS, REGINALD P., 1973, METALLOGENIC MAP OF PUERTO RICO: U.S. GEOLOGICAL SURVEY, MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I-721, ACCOMPANIED BY EXPLANATORY PAMPHLET, 6 P.}{Deposit:: VAZQUEZ, LEOVIGILDO, AND OWENS,JAMES P., 1958, GEOLOGY AND ORE DEPOSITS OF THE KEYSTONE IRON MINE NEAR JUNCOS, PUERTO RICO; ECONOMIC DEVELOPMENT ADMINISTRATION, DEPT. OF INDUSTRIAL RESEARCH, BULL.6,}{Deposit:: VAZQUEZ, LEOVIGILDO, 1960, GEOLOGY AND ORE DEPOSITS OF THE KEYSTONE IRON MINE NEAR JUNCOS, PUERTO RICO, ECONOMIC DEVELOPMENT ADMINISTRATION, DEPT. OF INDUSTRIAL RESEARCH, BULL. NO. 7}{Deposit:: BROEDEL, C. H., 1961, PRELIMINARY GEOLOGIC MAP SHOWING IRON AND COPPER PROSPECTS IN THE JUNCOS QUADRANGLE, PUERTO RICO: U. S. GEOLOGICAL SURVEY MISC. GEOL. INV. MAP I-326.}{Production:: VAZQUEZ,L.,1960, GEOLOGY AND ORE DEPOSITS OF THE KEYSTONE IRON MINE, DEPT. OF INDUSTRIAL RESEARCH, BULL.7} |