| Description |
leaves : illustrations, photographs ; 29 cm |
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vi, 79 pages : illustrations |
| Summary |
"The Missouri "Lead Belt" comprises approximately 50 square miles, centering around the town of Flat River, in St. Francois County. Missouri. This district has been producing lead for more than 200 years, the total production being at least 8,000,000 tons of lead, valued at more than $1,000,000,000. For many years, the annual production of the district has been at least one-fourth of the total production in the United States. An excellent description of the geology of this area was published recently by Ohle and Brown in 1954. The ore consists principally of galena which is disseminated within the Bonneterre formation of Upper Cambrian age. Some of the ore is associated with algal reef structures within the formation. This especially is true at the National Mine, where the writer was employed, so he had an excellent opportunity to study the relationship of ore deposition to the reef structures. One notable feature is that ore deposition is not uniform throughout these structures. Since Ohle had found permeability to be an important factor in localization of ore in the Mascot, Tennessee district, Dr. Brown desired that the influence of permeability in the localization of ore with respect to the reef structures be studied. The major reef-bearing zone in the National Mine was selected for detailed study. The National Mine is located between Flat River and Desloge, Missouri. The research was conducted with the consent and support of the St. Joseph Lead Company in cooperation with the Department of Geology of the Missouri School of Mines and Metallurgy, the permeability measurements being conducted in the Geology Department of the School of Mines during 1956 and 1957"--Introduction, leaves 2-3. |
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