Longwall mining with chain pillar recovery

Details Longwall mining with chain pillar recovery Longwall mining with chain pillar recovery

1976-03-08

1976-12-28

Purser, Ernest R.

Mining or in situ disintegration of hard material

Processes

Stabilizing underground structure

299 19, E21C 4100

Patent

active

039998045

ABSTRACT:
In a longwall mining system, a work face extends between parallel sets of multiple head- and tailgate entries, adjacent entries of each set being separated by rows of chain pillars. Lengths of a headgate entry immediately adjacent the longwall panel and the pillar breakthroughs to the next headgate entry are progressively pump packed in advance of the longwall face with a coherent thixotropic roof supporting material. As the longwall face is mined, a bidirectional shearing machine cuts through the roof supporting material and the chain pillars, which are then removed in a continuous operation.

REFERENCES:
patent: 2358687 (1944-09-01), Cassidy et al.
patent: 3892442 (1975-07-01), Janssen

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