Officially recorded as ISGS Index # 87, Odin Coal Company, 1 Shaft, Method = Modified Room and Pillar ( MRP ), 1887 1939, Seam Mined = Herrin Twp 2N, Rge 1E, Sec 13.
32.
Underground, the mine extends 1.5 miles west and 1.75 miles south of the shaft . This is a room and pillar mine with 37-foot pillars separating roads 37 feet wide on a square grid.
33.
This took the form of a bell pit, the extraction working outward from a central shaft, or a technique called room and pillar in which'rooms'of coal were extracted with pillars left to support the roofs.
34.
This room and pillar mine opened around 1877, and by the time of the explosion, mining extended more than 1000 yards from the hoisting shaft and the mine employed 60 miners and 20 other men.
35.
Mining techniques there had been changed 20 years before the 1958 bump, from " room and pillar " to " long wall retreating " after reports had shown the increased danger of " bump " phenomena resulting from the former technique.
36.
As the room and pillar mining method is used to extract limestone throughout the Midwest, many companies are looking at ways to utilize the hundreds of millions of square feet created in this manner for everything from mushroom farming to crude oil stockpiling.
37.
The first is the original drill and blast underground mining method ( MCR Mechanised Continuous Retreat or modified Sub Level Caving ) used in Mufulira main, secondly Room and Pillar with waste rock backfill employed at Mufulira East Portal, and thirdly Insitu Leaching of old stopes.
38.
Other methods include shrinkage stope mining, which is mining upward, creating a sloping underground room, long wall mining, which is grinding a long ore surface underground, and room and pillar mining, which is removing ore from rooms while leaving pillars in place to support the roof of the room.
39.
The Great Oolite limestone, known locally as " Bath Stone ", is easily worked and had been mined for construction purposes since Roman times, particularly during the 17th and 18th centuries when, extracted by the room and pillar method, it was used to build many of the buildings in Bath, Somerset.
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