A cutter drum for longwall mining machines and the like of the type comprising a rotatable member having cutting bits disposed on its outer periphery and arranged to rotate about an axis extending parallel to a mine floor, the drum being movable along a longitudinal face to produce a cut extending back into the face as the drum rotates and advances. Nozzles are carried on the end of the drum at the back of the cut for spraying high-pressure liquid into the material being mined to loosen and dislodge the same. This has the advantage of eliminating cutter picks at the back of the cut and materially reduces the generation of fines and dust in this area.