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Mining Engineering Coal Mining Difficulty: Medium

The gradient of the cross cut should not be less than

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Deck loading is very useful when This facilitates the reading of angles in prismatic compass . . . . . . . . A district mine ventilated by 30 m 3 /sec. Quantity of air and the wg in district is 25 mm. Find the resistance of the district. Square set support made of Multisection working in descending order employ longwall method of coal extraction with . . . . . . . . roofing.