Mining Methods and Machinery · Mining Methods · 1 mark · Numerical answer
A 3.0 m coal seam is mined by a double-ended ranging drum shearer with 0.5 m web depth. Panel width is 150 m and coal density is 1.4 tonne/m³. Find production per cycle in tonnes, to one decimal.
One face traverse removes volume 150×3.0×0.5 = 225 m³ and mass 225×1.4 = 315.0 tonnes. If “cycle” includes a cutting traverse in each direction, the total is 630.0 tonnes. The official key accepts both 315 and 630; the traverse convention accounts for the difference.
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