Different types of mining

Thoughout our history i society develop from living to caves to developing transportation,  from gardening to coal mining. We start five methods of underground mining, so we can use for energy source for the time. Those methods are :
Drift mining & Shaft Mining

Drift mining: is where the coal seam intersects the surface. The mine enters the seam in a horizontal direction following the coal

Room & pillar mining and continous mining and longwall ming.



Room & pillar mining: is nearly half the coal is left behind to support the mine roof. The pillars can "squeeze" putting pressure on adjacent pillars leading to roof collapse.

Continuous Mining: Is a machines use that can be used with drift or room & pillar mines. One miner can operate it to a rotating steel drum with tungsten carbide teeth to mine 5 tons of coal per minute Shaft Minging: Is a common method accessing a coal seam in which elevators provide access to mines.

Continuous mining machines are paired with conveyor systems to transport the coal from the mine as it is mined

Longwall mining: (a.k.a retreat mining) is highly effecient. When coal is removed, the machine retreats allowing the roof to fall behind it. It extract much more of the coal than room & pillars mines