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8/1/1999 - Information CircularsIn this report, recommendations are made to (1) replace the present regulations for certification of closed-circuit breathing apparatus with quantitative tests specifying metabolic work rate rather than activity, (2) continuously monitor relevant physio...
1/1/1990 - Information CircularsThe U.S. Bureau of Mines evaluated product-of-combustion characteristics of combustible materials used in coal mining in experiments conducted in an intermediate-scale fire tunnel, and evaluated each material's effectiveness for mine fire detection.
1/1/1987 - Information CircularsOutbursts are sudden and violent releases of gas and coal that result from a complex function of geology, stress regime, and gas pressure and content. The Bureau of Mines has reviewed methods for prediction and mitigation of such outbursts in use worldw...
1/1/1986 - Information CircularsThe Bureau of Mines used sulfur hexafluoride (sf6) tracer gas to evaluate the effectiveness of gob ventilation and/or sealing practices at three coal mines, each having different problems associated with their mined-out areas.