Mining or in situ disintegration of hard material – Processes – Stabilizing underground structure
Patent
1979-05-31
1980-08-12
Purser, Ernest R.
Mining or in situ disintegration of hard material
Processes
Stabilizing underground structure
299 13, 299 18, E21C 4104
Patent
active
042169984
ABSTRACT:
A method of sublevel caving and pillar and top coal extraction for mining thick coal seams includes the advance mining of rooms and crosscuts along the bottom of a seam to a height of about eight feet, and the retreat mining of the top coal from the rooms, crosscuts and portions of the pillars remaining from formation of the rooms and cross-cuts. In the retreat mining, a pocket is formed in a pillar, the top coal above the pocket is drilled, charged and shot, and then the fallen coal is loaded by a continuous miner so that the operator remains under a roof which has not been shot. The top coal from that portion of the room adjacent the pocket is then mined, and another pocket is formed in the pillar. The top coal above the second pocket is mined followed by the mining of the top coal of that portion of the room adjacent the second pocket, all by use of a continuous miner which allows the operator to remain under a roof portion which has not been shot.
REFERENCES:
patent: 1597023 (1926-08-01), Drennen
patent: 2358687 (1944-09-01), Cassidy et al.
patent: 2846205 (1958-08-01), Bucky
patent: 4030752 (1977-06-01), Simpson
Bowen Ray J.
Bowen William R.
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