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Geochemical Analysis, The Use Of Resistivity And Ground Penetrating Radar As Tools To Manage A Clay Mine, Applied To The Brick IndustryNormal access

Authors: Lisandro Suarez and Lanbo Liu
Event name: 17th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Site Characterization
Publication date: 22 February 2004
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 1.1Mb )

Periodically, a brick manufacturing company looks at their clay reserves and
estimates how the material changes. This paper reports the investigation of heterogeneity
of clay deposit in glacial Lake Hitchcock, Connecticut with direct current (DC) electrical
resistivity, ground penetrating radar (GPR), and geochemical analyses. The work entails
delineating sand-clay contact areas, determining how much clay is in reserves,
investigating water quality factors that have a bearing on brick quality, assessing mineral
and chemical variability of the clay pit subsurface, and characterizing preferential
pathways for surface water flow for the purpose of mine dewatering and control surface
mining moisture levels. Bore-log tests were conducted. Geochemical analysis of the clay
sampled at different depths provided data that when integrated with the geophysical
testing information, were used to characterize the pit and to correlate site geochemistry
with resistivity. Resistivity lab tests of various parameters were conducted to determine
clay resistivity signature versus moisture levels as well as to determine its relation with
field resistivity values. XRD of the clay sampled showed that the clay changed with
depth from illite to albite. GPR gave us an idea of the volume of sand needed for
extraction before mining the clay. GPR is excellent when used in areas that distinguish
differences in dielectric constant in between layers. The resistivity test provided
information on ore's depth and clay reserves.

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