Once crushed, valuable minerals are separated from the ore using different methods of Concentration, alone, or in combination: Gravity – Floatation – Optical – Magnetic – Electrostatic. The question is concerned with environmental impact and the production of tailings. The Froth Floatation method produces the most wet tailings. If the mine uses LESS Floatation and Gravity separation and MORE Optical and/or Electrostatic/Magnetic ENTER “1”. For a combination ENTER “2”. For a mainly Froth Floatation concentration system ENTER “3”.