Magnetic separation is an integral part of diamond ore processing plants to recycle ferrosilicon slurries as the heavy medium for density adjustments. Diamond processing operations require slurry density monitoring and adjustments to reject kimberlite gangue minerals through dense media separation (DMS) to produce a heavier fraction containing diamond crystals. Ferrosilicon is a strongly magnetic heavy material with an S.G. of 6.8 (i.e., 6.8 tonne /m3 in dry form) used for the preparation of the required slurry density. The target slurry density is referred to as a cut-point, which is about 3.05 tonne /m3 to get a high-quality concentrate of diamonds. (The dense medium slurry, in this case, requires the ferrosilicon to be finely ground before use as a pseudo-heavy liquid). a) Suppose that after rinsing the kimberlite tailing light fraction on wet screens (that is much coarser relative to fine ferrosilicone) with water the ferrosilicon slurry density becomes 45% solids (by wt.). Calculate the density (tonne /m3 ) of this slurry ( 5 marks). b) What is the density of the ferrosilicon slurry (in \% solids by wt.) corresponding to the cut-point referred to above? (15 marks). c) If 100 tonnes of the dilute slurry in section (a) is to be densified to the cut-point referred to above by mixing it with a magnetic concentrate of the ferrosilicon slurry coming off the magnetic separator at 95% solids (wt.), how many tonnes of the latter is required