Significant hazards to miners are created when active workings approach mined-out areas of either the same mine, or mines located adjacent, above, or below the active mine. Potential hazards include ...ground collapse and water or toxic gas inundation. These previously mined-out areas may be unintentionally penetrated if information pertaining to their location is not accurate or available to mine operators. To mitigate intersection risks, geophysical techniques offer means to detect the presence of old mine workings before they are encountered. The reliability of cross hole seismic tomography (XHST) was evaluated through a void imaging demonstration at the Colorado School of Mines Edgar Mine experimental facility. Construction of an isolating bulkhead permitted imaging comparisons between air-filled and water-filled void conditions. Despite rather small errors in void location, it is concluded based on imaging results that XHST can offer a reliable and sufficiently accurate method of void imaging for the purpose of mitigating the hazards related to intersecting abandoned mine workings.
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