Theoretical studies were performed on the propagation of seismic waves by trapped miners through the overburden of coal mines. These studies formed the basis for a geophone array and instrumentation design for the reception and recording of signals from a trapped miner. The studies, coupled with field tests, enable the performance of the trapped miner seismic system to be placed into a probablistic framework. The results show that the system should be capable of detecting the signal from a trapped miner for ranges exceeding 1,000 ft. Studies were also performed on the use of in- mine geophones for locating trapped miners. The results indicate that this approach may have an advantage over geophones placed on the surface of mines in the situation when either the mine is very deep or surface seismic noise is very high.