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Underground miners work in an artificial atmosphere which is likely to be subject to an inflow of contaminants. There are significant differences in...


= Encyclopedia Article; = Research Update
Figure 1.Longwall ventilation systems. (a) Two-entry Y-system. (b) Three-entry U-system.
Figure 2.Coal-bed methane drainage systems. (a) Premining vertical degas well. (b) Horizontal drilling during mining. (c) After-mining vertical gob degas well.
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