Abstract: Devices, systems, and methods for anchoring a drill rig at a borehole are disclosed. An anchor assembly includes a rod mountable within a borehole, an adapter positioned on an end of the rod, an anchor face unit having a plurality of drill rig assembly mounting features, and an anchor clamp mounted to the anchor face unit. The anchor clamp has a plurality of jaws movable from an engagement position wherein said plurality of jaws are positioned within an adapter groove to a disengagement position wherein said plurality of jaws are positioned away from said adapter groove.