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Hydraulic washing or Gravity separation CORRECT ANSWERS based on the difference in the densities of the gangue and or particles Electromagnetic separation CORRECT ANSWERS Separation based on differences in magnetic properties Chromite ore (FeO.Cr2O3 ) is separated from non-magnetic sillicious impurities and cassiterite ore (SnO2 ) is separated from magnetic Wolframite (FeWO4 + MnWO4 ). Froth floatation process CORRECT ANSWERS process used for the concentration of the low grade sulphide ...