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Mining Engineering Coal Mining Difficulty: Medium

In B.G the drill holes are drilled by

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The choice of site of an incline is limited to . . . . . . . . region. As per Mines Act 1952, the periods of work of any adult employee above ground shall not be more than "A" hours along with his interval for rest and he shall not work for more than "B" hrs continuously before he has had an interval of rest for at least 30 minutes. A and B are given by The life C.I. pipes used in sand stowing is . . . . . . . . lac ton of sand. Minimum life of mine should be more than . . . . . . . . years for adopting horizon mining. As per DGMS Circular which of the following factors is responsible most for causing the accidents due to Dumpers, trucks/tippers in opencast coal mines?