Drill bit and method of use thereof

A method of making a small diameter hole in a substrate such as the face of a mine, the method comprising (1) advancing to the mine face a rotary drill having a drill bit of a diameter of from about 50 mm to about 100 mm, the bit having a body including at least one socket, one end of a shank being received in the socket, a cutting element being held in a holder at the free end of the shank, the shank being free to rotate and thereby rotate the cutting element to form a small diameter hole in the substrate, the cutting element comprising a backing part and a facing part, the backing part being received and held by mechanical pressure of the shank, the facing part comprising an agglomerate of natural or synthetic diamond which provides the cutting edge, and (2) rotating the drill bit at a speed of from about 200 to 600 rpm, with the cutting element being caused or allowed to rotate to cut into the substrate and so drill the hole.