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Lead isotopes from the Upper Mississippi Valley district: A regional perspective
Timothy M. Millen, Robert E. Zartman, Allen Van Heyl
1995, Bulletin 2094-B
New lead isotopic data on galena from within and peripheral to the Upper Mississippi Valley lead-zinc district make it possible, by extending coverage to outlying locations, to trace the pathway traversed by the mineralizing fluids beyond the boundary of the main district. All but one of the samples exhibit elevated...
Industrial minerals of the Midcontinent: Proceedings of the Midcontinent industrial minerals workshop
Alfred Lerner Bush, Timothy Scott Hayes, editor(s)
1995, Bulletin 2111
The Midcontinent Industrial Minerals Workshop, in St. Louis, Missouri, September 16-17, 1991, was the fourth U.S. Geological Survey-sponsored meeting on the essential role of industrial rocks and minerals in the Nation's social and economic framework. The meeting was organized, supported, and the agenda was determined by a group from the...