Investigation of Microbially Induced Permeability Loss During In- situ Leaching.
NTIS: PB/83-205534 :71 pages
Accumulations of microorganisms in the in situ leaching environment are believed responsible for plugging of the ore body and thus decreasing uranium extraction. To assess the contribution of microbial growth to this problem, packed columns of ore and core specimens were leached in the laboratory. Samples collected at four in situ uranium mining operations revealed pseudomonads, xanthomonads, bacillus sp. and micrococcus sp. These microorganisms, inoculated into simulated leaching conditions, decreased permeability in two uranium ores by one order of magnitude in 20 days. Hydrogen peroxide alleviated microbial plugging in the laboratory. Periodic injection of hydrogen peroxide through the production well into the ore body may reduce microbial plugging problems in the field.
CP; Final Contract Report;
NTIS Accession No.
New Mexico, Inst. of Mining & Tech.