Study of projection of annual output, ownership cost, operating cost and cost per tonne of coal exposed by dragline

摘要

Dragline system is a capital intensive, high capacity and specialized mining equipment. A dragline is a great piece of earthmoving equipment. This study reveals that dragline performance depends on reliability, availability and maintainability characteristics of the system and calculate the annual output cost, ownership cost, operating cost and cost per tonne of coal exposed. Productivity of dragline could be increased by decreasing the amount of rehandle, cycle time and idle time of the dragline. Failure in any of the components could cause entire dragline to cease. The downtime of dragline should be minimized to reduce the heavy pecuniary loss. Preventive maintenance should be made at the same time to decrease recurrence of failure and downtime cost. Dragline performance could be improved by decreasing the cycle time and idle hour losses and upgrading the maintenance strategies. It is essential that all the subsystems remain in operating state for the maximum possible time duration for efficient working of the dragline system. The evaluation showed that efficiency and projected production of dragline could be enhanced by improving utilization factor. Poor utilization resulted due to nonavailability of blast muck, dozing operation, power and blast operations.