Fletcher's HDDR model has the most flexibility in mining thicker reservoirs than ever. The rig boom swivels from 1.2 to 6.1 m, allowing multiple anchors to be installed from the same chassis position. The booms enable the operator to drill through disturbed formations, near the sides of workings, as well as over areas with unstable and loose soils. The anchoring scheme is taken relative to the roof and does not depend on the soil.