a) A sample of an alluvial ore containing metal M was subjected to float and sink analysis to pre-concentrate. The separated fractions were then assayed for M, and the results are shown below (Table 1). Table 1: Float and Sink Results of Ore containing metal M Specific gravity Of test (1) 2.70-2.75 >2.75-2.80 >2.80-2.85 >2.85-2.90 >2.90-2.95 >2.95-3.00 >3.00-3.05 >3.05-3.10 >3.10 Fract. Weight (%wt) (2) 2.4 6.9 8.1 10.5 3.7 2.1 4.6 5.4 8.6 47.7 Assay (%M) (3) 0.05 0.13 0.16 0.27 0.63 0.92 1.10 3.04 4.26 8.85 i. ii. Determine the effective separation density (d50) (10 marks) How much of the feed material would report to sinks at the SG of 2.85? (5 marks) What is the assay (%M) of the material recovered in the sinks at this S.G (i.e.2.85)