Freezing process of shaft sinking introduced by
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Mining Engineering · all questionsCoal Mining
Coal Mining
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The stowing pipes in pneumatic stowing made of
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In which line of extraction one solid stook intervenes between two stooks under extraction at a time.
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OMS achieved by B. G method is more than . . . . . . . .
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Crane or grab used for clearing the debris upto a depth of . . . . . . . .
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Gallery in the process of being driven
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The extended portionof gate roads in L/W called
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The bord and pillar method adopted of the coal scam is thicker than . . . . . . . .
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The life of the M. S pipe used in sand stowing in lac ton of sand.
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Without derrick holes can be drilled depth of
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Under ground gassification, development done towards
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Cable drilling employed commonly employed for holes deeper than
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In drilled shafts all the sinking work can be carried out by
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Continuous record of bore hole deviation from top to bottom by an instrument by
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While driving slices, what should be the minimum thickness of rib of coal to be left against adjacent goaf.
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Pumps are employed when the make of water in the shaft exceed
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Common rate of sand stowing in μ/g mines is A tons of sand per hour. Value of A is given by . . . . . . . .
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The number of panels to be opened at a time decided by
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Water infusion of coal face in ploughing causes.
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With AFC the length of single unit face commonly
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