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- Mine locations, excavations, and structures:
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- Information Circulars
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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.
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Content source: National Institute for Occupational Safety and Health, Mining Program