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Mining

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High wall mining is another form of surface mining that evolved from auger mining. In high wall mining, the coal seam is penetrated by a continuous miner propelled by a hydraulic Push-beam Transfer Mechanism (PTM). A typical cycle includes sumping (launch-pushing forward) and shearing (raising and lowering the cutter-head boom to cut the entire height of the coal seam). As the coal recovery cycle continues, the cutter-head is progressively launched into the coal seam for 19. 72 feet (6. 01 m). Then, the Push-beam Transfer Mechanism (PTM) automatically inserts a 19. 72-foot (6. 01 m) long rectangular Push-beam (Screw-Conveyor Segment) into the center section of the machine between the Powerhead and the cutter-head. The Push-beam system can penetrate nearly 1,000 feet (300 m) into the coal seam. One patented high wall mining system uses augers enclosed inside the Push-beam that prevent the mined coal from being contaminated by rock debris during the conveyance process. Using a video imaging and/or a gamma ray sensor and/or other Geo-Radar systems like a coal-rock interface detection sensor (CID), the operator can see ahead projection of the seam-rock interface and guide the continuous miner's progress. High wall mining can produce thousands of tons of coal in contour-strip operations with narrow benches, previously mined areas, trench mine applications and steep-dip seams with controlled water-inflow pump system and/or a gas (inert) venting system.

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