The rig is a simple mobile cable percussion device which is towed by any suitable vehicle (something that can effectively carry the equipment and tow 22ft and 2 tons of rig chassis through difficult terrain). The type of vehicle is constantly under review and we have recently advanced from a standard 4×4 which has struggled, to a much larger left hand drive ex-fire truck which we have bespoke fitted to carry all the equipment needed.
The percussion drilling principle is actually very simple. Tools of differing types are suspended from a wire rope and are lifted and dropped to cut boreholes. It takes varying amounts of time to cut through the earth dependant on the substrates involved, but water is usually found within 30m of the surface in this region. More information on the drills and the equipment can be found at www.dando.com