Rise in Mining Activities Expected to Drive Global DTH Drill Market over the Forecast Period: Ken Research A DTH (down-the-hole) drill is basically a mini jackhammer attached on the bottom of a drill string. It is one of the fastest ways to drill hard rock. It is rotary with percussive type drilling. The direction of drilling is usually upwards instead of downwards. It can drill up to 500 feet or 150 meters… Read More »