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Mining Engineering Mine Supports And Strata Control Difficulty: Medium

The maximum number of coal faces in an underground bord and pillar development district is 13. The number of headings in the district is What should be the maximum period for remaining inside the mine for doing rescue work using breathing apparatus? An equipment cost Rs. 8,00,000 today and has a service life of 15 years. The salvage value at the end of 15 years is Rs. 2,00,000. What will be the value at the end of 10 years? Safe working velocity should not exceed at places where carbide lamps used . . . . . . . . At a surface mine office the independent Sound Pressure Level (SPL) measured in dB(A) on account of 3 drill machines are 85,88 and 85. If all the three machines work simultaneously, the combined SPL, in dB (A) is