Geoelectrical method uses variation of resistivity values to study subsurface geology structure, thereforeit can be applied to explore groundwater, pollution of groundwater, and geothermal exploration. In thisstudy, a physical modeling was built in the laboratory, that is used to resistivity measurement on coalsamples. The measurements employ Wenner-Alpha configuration. The result of the tests show that coallayer can be detected based on resistivity variation. The semi-antharasite sample showed higherresistivity than bituminous sample. This result is in accondance with the fact that semi antharsite drierthan bituminous sample.
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