Raise (mining)

      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:

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

      Raises serve a number or 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]

      References

      1. ^ Puhakka, Tulla (1997). Underground Drilling and Loading Handbook. Finland: Tamrock Corporation. p. 180. 
      2. ^ Puhakka, Tulla (1997). Underground Drilling and Loading Handbook. Finland: Tamrock Corporation. pp. 181–185. 
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      Last modified on 11 April 2013, at 00:56