room and pillar method meaning in Hindi

Examples

1. Mining was done by underground room and pillar methods.
2. The mines are located in Lea and Eddy counties, New Mexico, and are operated by the room and pillar method.
3. It has a grid of high, wide tunnels separated by square limestone pillars created by the room and pillar method of hard rock mining.
4. Quarrying is done using the room and pillar method, mining only half of the salt and leaving the remaining half to support what is above.
5. 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.
6. 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.
7. 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.