With a shaft of 4×4 or more, two staircases on opposite sides of the shaft going in the same clockwise direction can be added, allowing horizontal 'satellite shafts' to be added on each flight of stairs on opposite sides if the shaft, allowing for extremely efficient and exhaustive mining, and in shafts of 5×5 or more, a staircase can be ...
They may also be started into the wall of an open cut mine. Shafts are vertical ... phases of underground mining: ... vein such as a gold mine in the ...