Box-Holing or Up-Reaming

In this method of raiseboring, the pilot hole is drilled upwards to a higher level in the mine or civil project. Once the desired length has been achieved by the pilot drilling process, the drill string is retrieved, reamer attached and then pushed upwards into the backs.

The cuttings will fall to the lower level by gravity, and is collected in a special collection chute which is attached to the top of the raiseborer.