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How large can a coal block be in a longwall mining operation?
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coal mining
Schematic diagram of an underground coal mine, showing surface facilities, access shafts, and room-and-pillar and longwall mining methods.
In longwall mining, coal blocks are typically prepared with dimensions ranging from 100 to 300 metres in width and 1,000 to 3,000 metres in length for complete extraction.1
These blocks are extracted in slices, with the specific dimensions of each slice determined by the height of the coal, the width of the longwall face, and the thickness of the slice, which generally ranges from 0.6 to 1.2 metres. Modern mechanized operations utilize shearers or plows to create a continuous mining system, allowing for significant production capacities.1