room and pillar वाक्य
उदाहरण वाक्य
मोबाइल
- The salt is dug out by the room and pillar method, where about half the material is left in place to support the upper levels.
- Approximately 200, 000 tons of coal were dug at Grand Lake between 1639 and 1887 using surface collection, vertical shafts and the room and pillar system.
- However the latter may be easily confused with the collapse of old room and pillar coal mine workings which undoubtedly underlie the southern part of the town.
- Room and pillar mining often leads to retreat mining, in which supporting pillars are removed as miners retreat, allowing the room to cave in, thereby loosening more ore.
- Mine operators started using the " room and pillar method " _ carving the supporting pillars in a regular grid to allow space between them for roads and buildings.
- In general practice, the size of both room and pillars are kept almost equal, while in Bord & Pillar, pillar size is much larger than bord ( gallery ).
- No . 6 had a shaft, while No . 7 had a shaft . Both mines worked the same coal seam, using the double-entry room and pillar system of mining.
- Mine out horizontal orebodies with ease using our room and pillar modelling module, from creating the 3D orebody model to picking out your pillar areas then calculating volume and tonnages.
- Both mines were worked on the room and pillar system, with approximately height of extraction within the seams, leaving some ironstone for roof support ( c . 2.5m depth ) and roadway.
- Where the seams are relatively flat lying or gently dipping most of the mines were underground room and pillar operations, and where the seams are steeply inclined to vertical, stope mining was used.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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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