Electrical resistivity surveys have been successfully employed for groundwater exploration in limestone beds of the Murdar Ghar mountain range in Quetta valley. Applicability of electrical resistivity method, using Schlumberger configuration has been well demonstrated in the prevalent conditions. Electrical measurements made on the surface provide useful information about the electrical properties of the subsurface rocks and materials, which in turn are interpreted in terms of porosity, compactness, salinity, fractures and saturation of the bedrock. Other important parameters like depth extent of the overburden and configuration of the bedrock are also estimated from the resistivity results. Geological Survey of Pakistan is presently carrying out resistivity surveys, using Schlumberger vertical electrical soundings (VES), for the investigation of groundwater potential of Chiltan Limestone of Jurassic age in the Murdar Ghar mountain range on the eastern outskirts of Quetta valley, VES probes at more than 40 sites, on the three flanks of Murdar Range, have been completed thus far. Initial test well drilling at 8-10 selected sites located by the ongoing geophysical surveys have given highly encouraging results. Presence of high yielding water zones within fractured portions of the thick limestone sequence has been confirmed by test drilling. The Chiltan Limestone of Jurassic age, exposed in a widespread area of Murdar Ghar mountain range, can now be considered a highly prospective alternate source of groundwater for the Quetta valley. Selected field examples are presented. A detailed report is under process and will be issued shortly, after the completion of the present phase of investigations.