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Fig 1 1 Cutaway View of a Typical Longwall Mine In longwall mining a panel of coal typically around 150 to 300 metres wide 1000 to 3500 metres long and 2 to 5 metres thick is totally removed by longwall shearing machinery which travels back and forth the angle is generally less than 26 5 degrees then the lower angle of draw can be used

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SECTION I Introduction

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Increasing the pit slope angle by only a few degrees can decrease stripping costs Schematic diagram of an underground coal mine showing surface facilities

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A Study of Angle of Draw in Mining Subsidence Using

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Angle of draw In coal mine subsidence this angle is assumed to bisect the angle between the vertical and the angle of repose of the material and is 20° for flat seams For dipping seams the angle of break increases being 35 8° from the vertical for a 40° dip

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