Room and pillar (variant of breast stoping), also called pillar and stall,{sfnp|Mullineux|1973|p=50} is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars. The ore is extracted in two phases. In the first, `pillars` of untouched material are left to support the roof.....
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http://en.wikipedia.org/wiki/Room_and_pillar
Mine development technique employed in good bearing ground.
Found on
http://www.metalbulletin.com/Glossary.html
No exact match found.
