Mining or in situ disintegration of hard material – Processes – Breaking down by direct contact with fluid
Patent
1974-10-31
1977-03-15
Purser, Ernest R.
Mining or in situ disintegration of hard material
Processes
Breaking down by direct contact with fluid
299 18, 302 14, E21F 4100
Patent
active
040120767
ABSTRACT:
The invention is to a method for the hydraulic mining of coal of varying hardness. It is described in particular as to coal of the type occurring in the Balmer Seam in British Columbia. By the method at least two parallel spaced entries are driven upward through a seam of coal. Monitors are positioned in each entry. Each monitor is horizontally and vertically pivotable, and has nozzle means from which a jet of water under a pressure of about 1900 - 2200 p.s.i. is emitted. The high pressure jet cuts the coal, which is then fed to a machine that breaks and crushes the coal into sizes wherein the resultant coal/water slurry will flow down a sloped flume into a dewatering station.
The method further embodies differentially retreating along adjacent parallel entries by increments of desirably at least about 40 feet each. By the different retreat system, as a panel of coal is hydraulically mined in one entry, the monitor and associated equipment is a second adjacent parallel entry are moved back the desired increment to the next working position (retreated). When the panel of coal in the first entry is mined, the monitor is retreated in the same manner and hydraulic mining commences in the second adjacent parallel entry. The operation is thus alternated along the length of the parallel entries.
REFERENCES:
Boyd, Bureau of Mines Info. Circular 7887, 1959, pp. 1-33.
"The Japanese Search for Raw Materials", Mining Congress Journal, Feb. 1971.
Bureau of Mines Translation No. 216, 1957, pp. 430-442.
Heers Robert G.
Shoji Kouichi
Sieling Ronald E.
Taylor Joe T.
Kaiser Resources Ltd.
Mitsui Mining Co.
Purser Ernest R.
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