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Mining Engineering Mine Legislation And General Safety Difficulty: Medium

Why a layer of coal is left against the shaley roof?

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A longwall panel with a face height of 3.0 m and face length of 150.0 m is worked in 3 shifts per day employing 40 men per shift. The depth of the web of the shearer cutting coal is 0.5 m. The unit weight of the coal is 1.4 tonne/m 3 . Two full face cuts are executed per shift. The daily production from the panel in tonne is It is the load on a prop at which the upper member begin to slide called Shale pieces in contact with coal are known to . . . . . . . . spontanious heating. Class 'B' fires involve liquids generally quenched by . . . . . . . . If velocity of air in a settling chamber is 0.3 m/s, terminal velocity of the particle is 0.19 m/s then find out h/I ratio of the chamber assuming eddy factor 0.5