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Room and pillar mining was one of the earliest methods used, [3] although with significantly more manpower. The room and pillar system is used in mining coal, gypsum, [4] iron, [5] limestone, [6] and uranium [7] ores, particularly when found as manto or blanket deposits, stone and aggregates, talc, soda ash, and potash. [8]
Retreat mining is the removal of pillars in the underground mining technique known as room and pillar mining. In the first phase of room and pillar mining, tunnels are advanced into the coal or ore body in a rectangular pattern resembling city streets. Pillars are left between tunnels to support the weight of the overburden. The first phase is ...
Room and pillar : Room and pillar mining is commonly done in flat or gently dipping bedded ore bodies. Pillars are left in place in a regular pattern while the rooms are mined out. In many room and pillar mines, the pillars are taken out starting at the farthest point from the stope access, allowing the roof to collapse and fill in the stope.
It has a grid of 16-foot-high (4.9 m), 40-foot-wide (12 m) tunnels separated by 25-foot-square (7.6 m) limestone pillars created by the room and pillar method of hard rock mining. [1] The complex contains almost 10.5 miles (16.9 km) of illuminated, paved roads and several miles of railroad track.
Farquharson is credited with implementing Inco's "room-and-pillar" mining technique, which enhanced the efficiency and safety of underground operations. During his tenure, Inco's Copper Cliff Deep Mine emerged as one of the more productive underground mines in the worlds. [4] Farquharson was a director of the Mining Industry Human Resources ...
I propose that Retreat mining be merged into Room and pillar. As far as I can tell from the present article retreat mining, retreat mining is just a stage of the room and pillar system. As it is, both articles are also short enough that they could be served by a merger. If anyone knews anything that would change this impression, please say so.
To a miner, a partially completed tunnel resembles a room dug into the coal seam. As mining proceeds, the weight of rock overburden previously supported by coal mined from rooms is redistributed to pillars. If that weight exceeds the strength of a pillar, the pillar can fail by crushing or exploding. An explosive failure is called a “bump.” [2]
The construction of walls to support the ceiling was a completely manual job and consumed about 60% of the labour used in stoping. The importance of investigating another support system that would at the same time allow greater mechanization of the remaining stoping operations resulted in the transition to the room and pillar method. The ...