Groundwater Contamination (1984) / Chapter Skim
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12. Groundwater Restoration with In Situ Uranium Leach Mining
12. Groundwater Restoration with In Situ Uranium Leach Mining
Pages 147-156
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From page 147... ...
The latter part of the chapter covers the situation in South Texas. Economics and development of the industry, groundwater resources, regulation, and restoration activities are also reviewed.
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From page 148... ...
In situ leach mining is that method by which the ore mineral, in the original geologic setting, is preferentially leached from the host rock by the use of specific leach solutions and the mineral recovered. The leach solution, or lixiviant, is introduced into the formation through injection wells.
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From page 149... ...
investigated trace groundwater contaminants released during mining (in South Texas) and found that U was the major trace element to appear in significant quantity during groundwater sweeping (discussed below)
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From page 150... ...
Along with industry development and the present status of restoration activities, both the groundwater resources and regulation are reviewed. Development and Economics of In Situ Mining in South Texas Uranium was first discovered in the Tordilla Sandstone of Karnes County in 1954.
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From page 151... ...
Groundwater Resources of the South Texas Mining District The water resources of the South Texas U-mining district consist primarily of groundwater. This resource is highly variable in quantity and quality, and the impact of restoration on the resource is a question of major concern.
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From page 152... ...
Water use is not expected to exceed 75 x 106 m3/yr by the year 2000. Thus under present circumstances, there is not expected to be a water-quantity problem in this South Texas region in the near future.
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From page 153... ...
Values for the elements being checked were derived from analysis of the production area and water quality in the vicinity of production. These values were then used by the Texas Water Quality Board in light of EPA Interim Drinking Water Standards, the TWQB Hazardous Metals Board Order, and other pertinent data, to determine when adequate restoration had been accomplished.
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From page 154... ...
However, ammonium has been used at a number of commercial sites in South Texas, and these sites are yet to be restored to the permit's TABLE 12.1 Data for Ongoing Restoration at Intercontinental Energy Corporation's Pawnee Site, Texasa Parameter Achieved Target NH3-N U3O8 TDS Mo2+ C1ca2+ Conductivity 167 mg/L 2.4 mg/L 911 mg/L 2.8 mg/L 107 mg/L 80 mg/L 1899 mho/cm 0.01 mg/L 2.0 mg/L 903 mg/L 1.0 mg/L 250 mg/L 200 mg/L 1310 mho/cm Leaching reagents, NH3HCO3 + H2O2; area involved, 75 ft x 250 ft.; patterns involved, 5; restoration by groundwater sweep with reverse osmosis ancl spraying; pore volumes usecl, 2.
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From page 155... ...
. Literature review and preliminary analysis of inorganic ammonia pertinent to south Texas uranium in situ leach, Technical Report CRWR-155, EHE 78-01, Center for Research in Water Resources, The University of Texas at Austin; Kidwell, J
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