In underground mining a raise refers to a vertical or inclined excavation that leads from one level, or drift, to another. A raise may also extend to surface. There are four excavation methods for raises:
- Conventional or open raise
- Long-hole or drop raise
- Alimak
- Raise boring
Raises serve a number or purposes including:
- Transportation of ore and waste rock
- Ventilation
- Creating a free face for mining
- Movement of workers via manway ladders
Famous quotes containing the word raise:
“When we raise our children, we relive our childhood. Forgotten memories, painful and pleasurable, rise to the surface.... So each of us thinks, almost daily, of how our own childhood compares with our children’s, and of what our children’s future will hold.”
—Richard Louv (20th century)