In shaft sinking the holes are generally drilled by
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Mining Engineering · all questionsCoal Mining
Coal Mining
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Wireline drilling is possible upto a depth of
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Flap valve provided in
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Once the pillar extraction is commenced the splitting of pillars may be done upto pillars ahead of the pillar is under extraction.
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In Indian coal mining, first time an attempt made for extraction of 4.5 m in single shift at a mine with shield support.
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Coal bumps usually occur in
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The thickness of isolation stopping in degree 2 and 3 mts. thickness not less than
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If the depillaring proceeding from dip to rise and seam inclination is not mild so that goaf canbe submerged in water then the line of goaf is
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The material thrown with the help of high speed belt conveyar into goaf called
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Scaffold ropes are
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Stirrup is used for
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Which type drill bit suitable for soft rock
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Upward drivage of shaft carried out for a distance up to
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The diameter of steel rope used for rope drilling is
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For given parameter the greatest area of support offer by
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Face formed which is developed on bord and pillar method and extracting in longwall retreating with stowing method.
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Which life of pipe serves in sand stowing for 4 - 8 lac ton of sand.
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The tubbing plate is strengthened with
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Time taken to settle the goaf.
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Q100
Open questionBumps are classified in to . . . . . . . . types.
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