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Large aquifers should not coal haulage system is simpler, ventilation is overlie the coalbed. Oil and gas wells that better controlled, and subsidence of the Overall, longwall mining pillars of coal must be left to protect the wells. offers more opportunities for automation. Ideally, the strata overlying the coalbed...

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The largest producers of thin seam coal are the former U.S.S.R. and the U.S.A Other countries produce smaller tonnages but still have significant output. These two mines occasionally mined thin seams although their focus was not exclusively thin Duiker Nyembe. Vryheid. Durban Navigation.

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Twenty percent to 30 percent of mined coal underground is from longwall mining. This is performed by a mechanical cutter that shears coal off from a panel on the seam. The panel being worked on may be up to 800 feet in width and 7,000 feet in length. Mined coal is deposited onto a conveyor that moves the coal to a collection area.