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Applicability of Electrical Methods in Deep Detection and Monitoring of Conductive Lixiviants.


PB92193374

Publication Date 1992
Personal Author Hanson, J. C.
Page Count 39
Abstract Various electrical and electromagnetic (EM) geophysical techniques are currently being evaluated by the U.S. Bureau of Mines for their effectiveness in the detection and monitoring of electrically conductive (1 to 5 S/m) lixiviant (leach solution) to depths of 600 m, either above or below the water table. These techniques include magnetotellurics (MT), controlled source audiofrequency magnetotellurics (CSAMT), resistivity and focused resistivity, ground-penetrating radar (GPR), frequency-domain electromagnetics (FEM), and time-domain electromagnetics (TEM). Of these techniques, TEM may be the most effective, but CSAMT and focused resistivity also hold promise. Geophysical computer modeling of the borehole TEM technique was conducted based on an idealized geoelectric section (layered earth) with characteristics based on the Santa Cruz porphyry copper deposit near Casa Grande, AZ. Layer resistivities and thicknesses were obtained from geophysical data and geologic logs available from the site. Modeling of borehole TEM in both preleach and during leach situations was conducted. Simulating the TEM method using computer modeling proved to be encouraging since there were substantial differences between leached and nonleached responses. The modeling does not prove the effectiveness of TEM in the field, but does indicate that detection of deep lixiviant zones is theoretically possible.
Keywords
  • Magnetotelluric surveys
  • Electrical resistivity
  • Radar detection
  • Frequency domain
  • Time domain
  • Monitoring
  • Leaching
  • Boreholes
  • Graphs(Charts)
  • Lixiviants
  • In situ leach mining
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 48A - Mineral Industries
Corporate Authors Bureau of Mines, Minneapolis, MN. Twin Cities Research Center.
Supplemental Notes Library of Congress catalog card no. 91-11809.
Document Type Technical Report
Title Note Information circular/1992.
NTIS Issue Number 199218
Applicability of Electrical Methods in Deep Detection and Monitoring of Conductive Lixiviants.
Applicability of Electrical Methods in Deep Detection and Monitoring of Conductive Lixiviants.
PB92193374

  • Magnetotelluric surveys
  • Electrical resistivity
  • Radar detection
  • Frequency domain
  • Time domain
  • Monitoring
  • Leaching
  • Boreholes
  • Graphs(Charts)
  • Lixiviants
  • In situ leach mining
  • Bureau of Mines
  • 48A - Mineral Industries
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