--> Abstract: Remote Detection of Underground Coal Mine Fires Using Geophysical Methods, by K. L Hauser, D. R. Tweeton, and W. H. Pomroy; #90954 (1995).

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Abstract: Remote Detection of Underground Coal Mine Fires Using Geophysical Methods

K. L Hauser, D. R. Tweeton, W. H. Pomroy

Abandoned coal mine fires can be found in coal basins across the United states and around the world. These fires can burn for decades, resulting in the emission of toxic gasses and smoke, and prompting subsidence damage to both homes and property. In order to facilitate containment and extinguishment of abandoned underground mine fires, the location of the active burn front must be determined. Borehole temperature measurements are a reliable means of ascertaining subsurface conditions. Because burn fronts may extend over large areas and take on complex configurations, numerous boreholes may be necessary to accurately assess the situation. This approach can lead to excessive costs if employed on a routine basis. As part of continuing research efforts to characterize and control abandoned underground mine fires, the U.S. Bureau of Mines recently ompleted investigations to determine the effectiveness of several geophysical methods in mapping subsurface anomalies related to excessive heating. Magnetic gradient, electromagnetic induction, and controlled source audio-magnetotelluric profiling methods were tested at a known underground mine fire site in Wyoming. These non-invasive techniques are employed from the surface, and are capable of measuring changes in the conductivity or magnetic properties induced in rock by the heating action of a passing burn front. Systematic use of geophysical methods may reduce the number of boreholes required to complete a dependable assessment of subsurface conditions, and can guide the placement of boreholes to their most diagnostic and economic use.

AAPG Search and Discovery Article #90954©1995 AAPG Eastern Section, Schenectady, New York