Relatively large quantities of ground water were processed in the restoration attempt considering the small size of the project (1.25 acre). Concentrations of certain parameters, however, remained at levels above baseline six months after restoration ceased. Efforts were successful in reducing concentrations of the majority of contaminants to baseline levels. Attempts were made to restore the aquifer using a variety of methods. Ammonium carbonate lixiviant was used at one RandD in situ mine. Commonly used methods include ground water sweeping, clean water injection, and treatment by ion exchange and reverse osmosis technologies. Several methods have been developed to restore mined aquifers to pre-mining (baseline) quality. Aquifer restoration after in situ mining is not fully understood. As the lixiviant migrates through the ore body, uranium and various associated elements such as arsenic, selenium, molybdenum, vanadium and radium-226 are mobilized in the ground water. Frequently, the ground water in the mined aquifer is a domestic or livestock water supply. In situ mining of uranium involves injection of a leaching solution (lixiviant) into an ore-bearing aquifer. International Nuclear Information System (INIS) Aquifer restoration at uranium in situ leach sites
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