https://www.labelleexcuse.com/en/the-olive-grove/the-extraction/

The extraction

  1. WASHING
    As soon as they arrive at the factory, the olives are washed and cleaned of any leaf or stems by circulating them on a mechanical-hydraulic conveyor.
  2. PRESSING
    The second step is to crush the olives into a paste.  The consistency will vary with the variety being pressed.
  3. MALAXING THE PASTE
    The olive paste is then placed in a special mixer with spiral mixing blades.  This step is indispensible since it will allow small oil droplets to combine into larger ones.
  4. SEPARATION OF THE PHASES
    The following step consists in separating the oil from the rest of the solid parts by transferring the paste in a centrifuge.
  5. DECANTATION
    The last step is to separate the oil from the water and sediment.  5 to 8 kilos of olives are required to produce 1 kilo of oil.