Of or involving a single long face worked (usually mechanically) along its whole length: longwall mining
Más ejemplos en oraciones
- In 1976, Old Ben Coal Co., with Federal assistance, began a trial of modern mechanized longwall mining in a new area of their No.24 mine in the Herrin Coal seam.
- The three main underground mining methods are stoping, room-and-pillar mining, and longwall mining.
- A single longwall path can stretch for two miles, causing everything on the surface directly above it to collapse.