Broad-band microseismic monitoring provides much more quantitative information about the behavior of a rock structure than can be obtained by traditional microseismic monitoring. When used regularly by experienced personnel, it can become a valuable engineering tool in detecting, delineating, and estimating the stability of potential failure zones in rock structures. In deep mines, the location of zones of inferred high stress can be pinpointed in space. All rock bursts recorded during this study had their foci in these inferred high stress zones, but not all of these zones experienced rock bursts. The destressing of a potential rock-burst zone, while not yet done in this study, should now be more effective since these zones can be precisely located. Attempts at destressing can be evaluated readily by monitoring with this technique. [the use of low-sensitivity pickups should make this technique useful in areas where there is a continuous background of small rock noises. Such noises would essentially be filtered out by pickup selection.] for precise source locations in rock structures where stress changes may occur daily, seismic velocities must be determined daily.