Abstract
ABSTRACT Nine cores and approximately 200 samples from a sedimentary-type uranium ore body of the Upper Jackson formation located in Karnes County, Texas were studied to determine the stratigraphy and the mineralogy, in relation to the uranium distribution. The ore body is generally a fine-grained, gray, well-sorted arkosic sandstone enclosed in finer-grained, poorly-sorted lagoonal or paludal mudstone or lignite. The deposi-tional environment of the ore body is presumably a beach-barrier-bar sequence. The bulk mineralogy consists primarily of quartz, and feldspars with minor amounts of biotite, muscovite, augite, clinoptilolite and very minor amounts of hematite, pyrite and cof-finite. The clay analysis reveals a preponderence of smectite with very minor amounts of kaolinite and illite. High concentrations of uranium are generally associated with a high concentration of clays, zeolites and/or carbonaceous material. Additionally, uranium concentration usually increases with a decrease in size fraction. Thus, the expandable and absorptive smectite and/or the absorptive and ion exchangable zeolites could play a significant role in uranium mineralization.
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