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https://en.wikipedia.org/wiki/Room_and_pillar_mining
Room and pillar (variant of breast stoping), is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars. To do this, "rooms" of ore are dug out while "pillars" of untouched material are left to support the roof overburden.Calculating the size, shape, and position of pillars is a complicated procedure, and is an area of ...
http://sunrisecoal.com/operations/carlisle-mine-indiana/room-and-pillar-mining/
Room and Pillar Mining is Safe, Efficient & Environmentally Friendly. Room and pillar mining is a non-subsidence plan for a mine, preserving the precious farmland above.It is among the safest and one of the most ecologically-friendly approaches to mining coal today, creating a non-subsidence environment (no movement of land) and maintaining clean water standards.
https://www.rimworldwiki.com/wiki/Structure
A single wall pillar will support a roof in the area around it. A roof is an area of cover from the elements. A roof can extend up to 6 cells from a wall, so roofed interiors have a maximum size of 12 cells across the shortest side. Interior areas built larger than this will remain partially unroofed. Larger roofed areas can …
https://www.cdc.gov/niosh/mining/UserFiles/works/pdfs/2011-171.pdf
Underground stone mines in the United States use the room-and-pillar method of mining in generally flat-lying bedded formations. Pillar and roof span stability are two essential prerequisites for safe working conditions in room-and-pillar mines. Unstable pillars can result in
https://www.osti.gov/biblio/405579-state-art-room-pillar-retreat-mining-kittanning-coalbed
@article{osti_405579, title = {State-of-the-art-room-and-pillar retreat mining in the Kittanning Coalbed}, author = {Campoli, A.A. and Rebuck, D. and Mucho, T.P. and Molinda, G.M.}, abstractNote = {The US Bureau of Mines is conducting research to develop improved guidelines for selecting the type and pattern of roof support in different geologic environments.
https://arlweb.msha.gov/S&HINFO/PROP/PROPBulletins/2008/2008%20PROP%20Booklet.pdf
occurring on room-and-pillar retreat sections appears high when you consider that retreat mining accounts for about 10 percent of all underground coal production. This statistic indicates that more precautions must be taken when doing this type of mining. Roof/Rib Fall Fatals By Activity Room-and-Pillar Retreat Mining 2000 - 2007 Miner Operator ...
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