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- Mine locations, excavations, and structures:
- Faces
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- Reports of Investigations
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Results 1 - 7 of 7
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1/1/2011 - Reports of InvestigationsDust surveys determined if deep-cut mining expose face workers to higher levels of respirable dust. Study findings indicate that levels on bolting faces did not appear to be affected by longer cycles associated with deep-cut mining practices.
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This NIOSH publication demonstrates how existing and new engineering controls can be used to reduce face methane levels.
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1/1/1992 - Reports of InvestigationsThis report investigates that application of jet fans to ventilate cuts that extend beyond 40 feet. The results of tests involving a jet fan in a 90 foot entry, its benefits and potential problems are discussed.
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1/1/1984 - Reports of InvestigationsThe Bureau of Mines has successfully tested a method to simulate methane (CH4) flows from face areas through the returns of noncoal mines. This technique involves releasing a small quantity of tracer gas at a working area and sampling for that gas downs...
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1/1/1980 - Reports of InvestigationsThe face ventilation measurement method developed by the Bureau of Mines involves releasing a small volume of tracer gas (SF6) on the off-curtain side of the working face at the start of the mining cycle.
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1/1/1977 - Reports of InvestigationsThis Bureau of Mines report deals with water infusion of coalbeds, which can control methane emission at face areas during developmental mining and which may sometimes suppress dust. Studies show that water infused into the coalbed flows through the fra...
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1/1/1976 - Reports of InvestigationsCoalbeds exhibit a directional permeability, with the maximum permeability oriented parallel to the face cleat. Thus, the most efficient pattern of vertical degasification holes for a coalbed is dependent upon cleat orientation. Analysis of surface joi...
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Content source: National Institute for Occupational Safety and Health, Mining Program