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_____ mining consists of digging tunnels or shafts into the earth to reach buried coal deposits.

A. Mountaintop removal
B. Hydraulic fracture
C. Strip
D. Subsurface

Answer :

d. Subsurface mining involves creating tunnels and shafts deep underground to access coal deposits, distinguishing it from surface mining methods like strip mining or mountaintop removal.

d. Subsurface mining consists of digging tunnels or shafts into the earth to reach buried coal deposits. This method, which is also referred to as underground or deep mining, is utilized when coal deposits are found several hundred feet below the surface. Subsurface mining involves miners using large machines to dig out the coal, after descending into deep mine shafts via elevators.

There are different types of subsurface mines, including drift mines, slope mines, and shaft mines, varying in the way these shafts and tunnels are constructed to access coal deposits. This mining technique contrasts with surface mining methods, such as strip mining or mountaintop removal, which involve removing soil and rock overburden to access coal seams closer to the Earth's surface.

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