Mining Methods and Machinery · Mining Methods · 2 marks · Numerical answer
A dragline bucket holds20 m³ with fill factor0.9. Digging/filling takes20 s, total outward-and-return swing32 s and dumping10 s. Utilisation is90%. Find output in m³/hour to one decimal.
One complete cycle takes20+32+10=62 s, since the swing time already includes both directions. Effective loaded bucket volume is20×0.9=18 m³. Hourly output=18×3600/62×0.90=940.645 m³/hour, or940.6.
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