4 (10 marks) A copper mining operation has two deposits which it can mine and process. These deposits have different mineralogy and this results in the different characteristics shown in the data table that follows. The process plant is a SAG mill - ball mill - cyclone circuit where the SAG mill which can draw 20 MW of power is the bottleneck for throughput. The separation process used to concentrate the copper minerals is flotation. Ore A has a head grade of 2.87% Cu and Ore B has a head grade of 1.76%. ere is data for each of the ore's Ore A Ore B Copper mineral in ore Chalcocite Cu2S Chalcopyrite CuFeS2 Copper mineral grade in ore (%) 3.6 5.1 Bond Work Index of ore (kWh/t) 15.0 11.9 A*b value 32 45 Overall recovery of copper to final concentrate 90% 95%. (d) Estimate the SAG mill power required to process Ore A and Ore B at the throughputs calculated in (c) and state which ore or ores would allow the operation to meet production targets. Clearly state the reasons for your choice. (4 marks)