Raise (mining)
From Infogalactic: the planetary knowledge core
File:Emergency egress.jpg
An emergency escape raise.
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[1]
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[2]
References
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