Raise (mining) explained

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:

1. Conventional or open raise
2. Long-hole or drop raise
3. Alimak
4. Raise boring^[1]

Raises serve a number of purposes including:

1. Transportation of ore and waste rock
2. Ventilation
3. Creating a free face for mining
4. Movement of workers via manway ladders^[2]

Notes and References

1. Book: Puhakka , Tulla . Underground Drilling and Loading Handbook . Tamrock Corporation . 1997 . Finland . 180 .
2. Book: Puhakka , Tulla . Underground Drilling and Loading Handbook . Tamrock Corporation . 1997 . Finland . 181–185 .