Use the information in the table below to answer the following questions. Show the formulas you use and your calculations: a. Determine the shovel requirements [12] b. Determine the truck replacement period in years [16] c. Determine drill rig requirements for the 140mm diameter holes [10] Shovels Trucks Drills Av % 90% 86% 60% Ut % 95% 85% 70% P1 % of DOH % 5% 10% 40% NT Days/yr 20 30 30 Truck payload t 95 Truck cycle time Minutes 40 Ore production Mtpa 6 6 6 Waste production Mtpa 12 12 10 Narrow bench waste Mtpa 2 2 2 Total production Mtpa 20 20 18 Expected life per machine Hr 80000 60000 25000 Drill yield ore (311mm) t/m 50 Drill yield waste (311mm) t/m 120 Presplit yield (140mm) t/m 100 Buffer blast yield (140mm) t/m 20 Penetration rate (311mm) m/hr 13.5 Penetration rate (140mm) m/hr 17.0 Ore loading rate t/hr 750 Waste loading rate t/hr 800 Narrow bench loading rate t/hr 550