Three key points about imaging subsurface parameters between boreholes: 1. Downhole IP and resistivity tomography techniques provide more information than traditional drilling alone by assessing continuity of structures and detecting conductive zones between and around boreholes. 2. EarthProbe tools can map resistivity and chargeability between boreholes up to 250m apart, helping understand the subsurface. 3. New directional surface-to-borehole imaging provides directional information on zones between holes to improve drill targeting.