Method and apparatus for strip mining

Details Method and apparatus for strip mining Method and apparatus for strip mining

E - Fixed Constructions

21

C

262/6

E21C 41/00 (2006.01)

Patent

CA 1076616

ABSTRACT OF THE DISCLOSURE A method and apparatus for strip mining is provided. A plurality of vertical shafts of square cross section are formed closely adjacent to one another with each shaft extending through overburden and a layer of valuable material, e.g. coal. As spoil is removed in forming one shaft it is conveyed to a previously formed shaft and deposited therein. The apparatus includes a casing of square cross section, a cylindrical auger casing within the square casing, an auger rotatable in the auger casing and a square cutter at the lower end of the square casing. The latter is slidably mounted on a vertical track and is power driven vertically to force the cutter into the earth formation being worked. The auger is rotated under power to cut into the earth formation and remove spoil and coal therefrom. The upper end portions of both casings are formed with two sets of aligned discharge ports. A movable closure is provided for each set and a rake for each set. A conveyor for spoil has one end connected to the outer port of one set while a conveyor for coal has one end connected to the outer port of the other set. When one set is closed, the rake associated therewith is in an inoperative position. When a set of ports is open, the rake associated therewith extends into the uppermost convolution of the auger. In this manner, strip mining is efficiently carried out while satisfying todays environmental requirements manner by depositing the overburden in a previously formed shaft.

273889

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