Basics in Minerals Processing - Minerals in operation. 2. Size reduction. 3. Crushing. Grinding. Size control. 4. Screening. Classification. Enrichment. 5. Washing. Gravity separation. Flotation.mineral separation processing,Processing a rare earth mineral deposit using gravity and magnetic .Rare earth (RE) mineral deposits are typically processed using several different unit operations including flotation, gravity, magnetic and electrostatic separation.