Given the following:

Bucket volume of loader: 3.6 L m³ (loose cubicmeters)

Loader cycle: 0.42 min

Truck capacity: 11.5 L m³

Truck traveling time with load 2.28 min

Truck maneuvering for tipping and tipping time 0.65 min

Truck return time 1.18 min

Truck maneuvering for loading 0.40 min

Planned activities (lunch, breaks etc…) 0.64 min

Waiting time at loader (per cycle) 0.50 min

Conversation with supervisor (per cycle) 0.25 min

Other cycle time affecting machine performance 0.75 min

Swell factor 1.12

Bank Density 1,930 kg/m³ (in situ)

And the following equation:

P = (Q x T) / t

Where

P = Performance /hr (tonnes/hr)

Q = Loaded(shovel/loader) Capacity of truck (tonnes)

T = Productive time in minutes/hour

t = round trip cycle time (i.e. excluding unavoidabledelays)

Calculate

1. Number of buckets required to fill the truck (use nearestinteger)
2. The loading time of the truck. (Assuming 0.1 min to load thefirst bucket)
3. The total unavoidable delay time per cycle .(i.e. Plannedactivities + Waiting time at loader + Conversation with supervisor+ Other cycle time affecting machine performance)
4. The round trip cycle time “t” ( See definition of “t”above)
5. The productive time per hour (.i.e. time minus delays)
6. The tonnage hauled per cycle
7. The performance per hour