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

The extraction

  1. WASHING
    As soon as they arrive at the plant, the olives are washed and cleaned removing any leaves and stems by running them along a vibrating hydraulic conveyor belt.
  2. PRESSING
    The second step is to crush the olives into a paste.  The consistency will vary with the variety being pressed.
  3. MIXING THE PASTE
    The olive paste is then transferred into a special spiral mixer. This step is indispensable as it permits small oil droplets to fuse into larger ones.
  4. SEPARATION
    The following step consists of separating the oil from the rest of the solid parts by transferring the paste into a centrifuge.
  5. DECANTATION
    The final 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.