room and pillar meaning in Hindi

Examples

1. This is the tool to have for room and pillar mining.
2. Room and pillar layouts, similar to underground mine design, provide an economical construction arrangement.
3. Another method, known as room and pillar, is used for thinner, flatter ore bodies.
4. Mining was done by underground room and pillar methods.
5. It was a room and pillar operation with an estimated recovery of about 35 %.
6. Underground mining began, using a room and pillar approach.
7. Longwall mining has been extensively used as the final stage in mining old room and pillar mines.
8. The key to successful room and pillar mining is in the selection of the optimum pillar size.
9. Nuttallburg was closely associated with the Nuttallburg underground mine, a room and pillar mine that was sealed in 1958.
10. The Peerless Mine was an underground room and pillar operation that mined coal near the outcrop of the Wyodak seam.