The close agreement between this equation and the Monte Carlo simulation results for recovery error amplification are shown in Figure , although again it is not a perfect fit (see Section 2.1.1). between the tailings and feed grade. This could occur for a gangue species present at low concentrations in the feed and high concentrations in the tailings stream, but this requires that there be a high yield to the product stream. This situation is unlikely to occur in practice as most industrial separators treating low-grade feeds operate with yields well below 50 wt.%.