Mining or in situ disintegration of hard material – Processes – Stabilizing underground structure
Patent
1978-02-27
1980-09-16
Purser, Ernest R.
Mining or in situ disintegration of hard material
Processes
Stabilizing underground structure
299 17, 299 19, E21C 4104, E21C 4500
Patent
active
042226120
ABSTRACT:
The method of mining flat-dipping and sloping beds of a mineral with hydraulic excavation which includes dividing the bed being mined into levels and sublevels. The height of the sublevels is determined by the rock geology of the bed formation. The sublevels, in their turn, are subdivided into blocks, the width of each block being short of the limit length of the steady or self-supporting outreach of the cantilever of the rock of the main roof with the given pattern of cutting into the bed with the cutting drifts and holes defining the short working faces. The spacing of the blocks being worked in the upper and lower sublevels in the direction of strata is set to preclude inter-influence of the bearing rock pressure in the blocks where the stoping work is being done. The method enables the conduction of a stable excavation of the mineral over an extended front of stoping.
REFERENCES:
patent: 796499 (1905-08-01), Claghorn
patent: 957364 (1910-05-01), O'Toole et al.
patent: 1276952 (1918-08-01), O'Toole
patent: 2358687 (1944-09-01), Cassidy et al.
"Hydraulic Mining of Coal", by Parkes & Grimley Mining Congress Journal, pp. 26-29, May-1975.
"Hydraulic Mining", Mitsui Mining, Ltd., 14 pp., 6-18-75.
Kostovetsky Semen P.
Odinokov Boris P.
Sankov Anatoly E.
Semenikhin Anatoly Y.
Soin Vladimir V.
Nissen J. Harold
Purser Ernest R.
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