Accuracy

The image to the right shows a test where the designed drillhole was marked on the ground with a large 'X' and the driller navigated to it and started to drill. The distance between the actual position and designed position was approximately one foot. When drillholes are offset like this, the result is larger and smaller burden and spacing distances than needed for optimum fragmentation. DrillStar, using GPS, provides tighter control than a surveyor marking positions.