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The direct method of determining methane content of coalbeds for ventilation design
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    Report of investigations (United States. Bureau of Mines) ; 7885
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  3. Apparatus for measuring the gas content of coal or rock core samples
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    August 1999
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    The direct method test was developed for general mine safety applications by the U.S. Bureau of Mines in the early 1970's to measure the gas content of coal samples obtained from the relatively shallow depths of eastern U.S. coal mines. Over time, ap...
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    Longwall mining alters the fluid-flow-related reservoir properties of the rocks overlying and underlying an extracted panel due to fracturing and relaxation of the strata. These mining-related disturbances create new pressure depletion zones and new ...
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