For many explorations, the best results are obtained when more than one technique is applied. For example, for the detection of voids, we have successfully employed a battery of geophysical methods including GPR, DC resistivity, and seismic reflection to provide the desired level of definition.
The decision whether to use a specific geophysical technique depends on its cost-effectiveness as compared to other technologies. At D'Appolonia we provide a wide range of geotechnical services, and we are well aware of the situations where use of geophysical techniques is likely to be beneficial. We strive to provide geophysical services only under circumstances where they can be expected to provide a clear benefit.
Mine Void Detection at Coal Refuse Disposal Site in West Virginia
D’Appolonia was retained by the Mine Safety and Health Administration (MSHA) to perform a demonstration of the Time Domain Electromagnetic (TDEM) and DC Resistivity surface geophysical methods for detecting mine voids and subsequent verification of the geophysical interpretation based on borings and imaging of parts of the mine workings in the Lewiston Coal seam at the Lots Branch Tailings impoundment site in Prenter, West Virginia.
Geophysical Characterization of Abandoned Coal Mine
D’Appolonia was retained to perform geophysical studies identifying optimum boring locations for a subsurface exploration program at a site that was heavily undermined. The results of the geophysical exploration program indicated that mine workings were not present over much of the site, greatly reducing the need for the drilling of exploration borings.
Geophysical Characterization of Fine Coal Refuse
D'Appolonia conducted a study to evaluate the potential for energy recovery from fine coal refuse using electromagnetics (EM) and DC resistivity. The study confirmed that geophysical techniques can be utilized to characterize fine coal refuse and are useful for planning coal refuse recovery operations.
Geophysical Characterization of Abandoned Coal Mine Workings
Geophysical techniques were employed at a proposed power plant site in south Indiana to supplement conventional subsurface exploration methods. DC resistivity proved to be an effective tool for locating subsurface mine workings and imaging subsurface cross sections.
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