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In mining, a vertical shaft is used to take workers down to the horizontal tunnels so that they can get access to the working areas. The vertical shaft is then also used to return the mined ore to the surface for treatment. Some vertical shafts are very deep. Mponeng gold mine, which is the deepest mine in the world requires miners to go down in three separate lifts to reach the working area. Sinking the vertical shaft for a mine requires huge amounts of capital - which can only be justified if the ore body is of sufficient quality to be economic.