Method and apparatus removing a mineable product from an undergr

Details Method and apparatus removing a mineable product from an undergr Method and apparatus removing a mineable product from an undergr

1991-04-09

1992-08-18

Bagnell, David J.

Mining or in situ disintegration of hard material

Processes

Explosive

299 18, 299 68, E21C 3712, E21C 4104

Patent

active

051393123

ABSTRACT:
A method of removing a mineable product, such as coal, from an underground seam of mineable product, such as a coal seam includes the steps of drilling a vertical hole from the earth's surface through the seam of mineable product, installing in the recovery hole a vertical auger and a pipe extending from the auger to the earth's surface, drilling a plurality of closely spaced apart injection holes from the earth's surface through the seam of mineable product, the injection holes being drilled in a pattern extending from the recovery hole, inserting an explosive in the seam of mineable product where penetrated by each of the injection holes, sequentially igniting the explosive in each of the injection holes to blast fractured mineable material from the seam, injecting water sequentially in the injection holes to move fractured mineable material toward the recovery hole and operating the auger to raise to the earth's surface the fractured mineaable product that has been blasted from the seam.

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