Air and mud are both options for the flushing media; the choice of the material depends on the lithology of the site.
Down-the-hole drilling is a variation on rotary drilling that adds the percussive cutting power of a pneumatic drill situated at the end of the drill pipe. The down-the-hole drill hammer rapidly strikes the subsurface as the drill rig rotates the drill stem. The compressed air that the drilling rig uses to drive the drill removes the cuttings as the drill produces them. The cuttings that down-the-hole drilling produces are large and defined.
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