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Shallow coal seam mining system - uses shaped charge to blast cavity at bottom of one shaft through which water is pumped to form slurry raised through second shaft
Shallow coal seam mining system - uses shaped charge to blast cavity at bottom of one shaft through which water is pumped to form slurry raised through second shaft
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机译：浅层煤层开采系统-使用定型炸药炸开一个竖井底部的型腔，通过抽水将水泵送通过第二竖井形成浆液
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摘要
A shaft is sunk through spoil layers, such as sand, dirt, clay, sedimentary deposits, slate, etc., to the coal. A second shaft is drilled from the surface to the coal in proximity to the first shaft, and a small shaped charge is placed down the first shaft and directed toward the termination of the second shaft. A pipeline containing a directive nozzle is then directed down the first shaft with the nozzle oriented toward the second shaft and water and air pumped through it. A line is dropped through the second shaft terminating in a hydraulic elevator, water being pumped down the shaft and up through the hydraulic elevator.
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