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Mining Engineering Mine Rules And Regulations Difficulty: Medium

What is the depth to be achieved for an excavation to be called a coal mine?

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Over 80% of underground coal production in India comes from P-5 explosives are used for Danger zone of blasting for opencast is stipulated by Circular as- A district separated from other districts by a barrier called . . . . . . . . The equivalent orifice formule in SI units.