Scale model investigations of the Applied Potential method for crosshole delineation of a conductor
The Applied Potential method finds important application in mineral exploration. To better understand the detection and delineation capabilities of the technique, especially where (conductive) mineralisation is discontinuous, we have carried out a series of laboratory experiments using a 3D tank model system. Crosshole electric measurements were made with a bipole-bipole array, with one current electrode located in each simulated borehole. Both scanning (both bipoles moved together) and profiling measurements (using one fixed bipole and one mobile bipole) were conducted rather than full tomographic imaging. Five different classes of cylindrical model were studied, which were distinguished on the basis of (1) cylinder orientation relative to the plane of the boreholes, (2) whether the target was continuous, terminating, or broken between the points of measurement, and (3) whether the conductor was intersected by one or both boreholes...
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