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Mining Engineering Drilling And Blasting Difficulty: Medium

Simplified form of gas mask is

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Out of the support categories given for an underground coal mine, identify the 'active support'. The thickness of thickest seam in India is in meters. A person appointed to superintend the lowering and raising a persons, tools, and materials and transmit signals at the top of shaft or incline. The maximum gap between two chock shield support is A haul ramp of 6% grade to be constructed connected to a bench of 15 m height to surface. The cost of ramp construction is 1 million rupees per km; the cost of the ramp construction in million ruppes will be . . . . . . . .