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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

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