where x75 and x25 are the particle sizes at which the grade efficiency is 75% and 25%, respectively. For perfect classification V '= 1, while values above 3 are considered poor. Alternatively 10 V '90 has been used.

These ratios are not always adequate to define the sharpness of cut. In many cases it is important to keep the amount of fines in the coarse or the amount of coarse in the fines as small as possible. For these cases a measure of the effectiveness of a separation process is given by the following for the coarse yield:

Weight of particlesoufliser than e in the coarse fraction Weight of particles coarser than ? in the feed

Similarly, for the fine yield:

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