What is deep coal mining and open cast mining? What are the advantages and disadvantages?
Wh n the coal is located just below the Earth's surface w us open cast mining.
When coal is located in deep below Earth we have to adopt deep mining.
Open cast mining.Only remove the top layer debris of rocks and w get coal..Huge trucks can come down through slopes and remove and load, transport coal..This is cheaper and less dangerous.
Deep mining require drilling deep shafts few kilometer down and then make horizontal passages..possibility of flammable gases risk always there so forced ventilation transport lifts etc are involved. THis is costly and risky. picture old cola mine deep shaft
picture credit free press genealogy roots.