Reference | {Deposit:: HEYL, A. V., 1968, THE UPPER MISSISSIPPI VALLEY BASE - METAL DISTRICT; IN RIDGE, J. D. ED., ORE DEPOSITS OF THE U.S., 1933 - 1967, V. 1, P 431 - 459}{Deposit:: VARIOUS AUTHORS, 1961 - 1966, GEOLOGY OF PARTS OF THE UPPER MISSISSIPPI VALLEY ZINC - LEAD DIST.; U. S. GEOL. SURV. BULL. 1123 A - I}{Production:: WORLD MINING 6 - 25 - 76 P. 194. RAUSCH AND MARIACHER, 1970, AIME SYMP. PB - ZN V. 1 P. 910, 914. HEYL, A. V., 1968, U. MISS. VALLEY DIST.; IN ORE DEPOSITS OF U. S. 1933 - 1967, P. 434, 435}{Reserve-Resource:: ENGINEERING AND MINING JOURNAL 1 - 77 P. 143} |