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Page 5983, results 149551 - 149575

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Publication Extents

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Investigations of the principal fluorspar districts of Mexico
Ralph Erskine Van Alstine, Samuel Estrada, Ernesto de la Garza
1963, Open-File Report 63-124
As a result of the increasing need for fluorspar, especially in North America, the Mexican fluorspar industry expanded greatly is the 8-year period, 1952-1960. Since 1956, Mexico has been the world's largest producer and exporter of this commodity. From 1956 through 1959 Maltice imported about 90 percent of the fluorspar...
High-alumina kaolinitic clay in the United States, exclusive of Alaska and Hawaii
Helen R. Mark
1963, Mineral Investigations Resource Map 37
The general distribution of high-alumina kaolinitic clay deposits in the United States (exclusive of Alaska and Hawaii) is shown on the accompanying map. The locations of mines, pits, and prospects are shown by appropriate symbols. Certain clay-bearing areas are shown by patterns that designate the geologic age of the deposits....