Stock Photo: OLIVE TREE PLANTATION. OLIVE TREE PLANTATION Photo essay. Olive farming near St Michel le Frigolet Abbey in Tarascon France. Harvesting using a comb or rake. The Barres mill, built in 1992 on the site of the old mill, uses modern technology to press the olives. Once the olives are washed and crushed, a mixer-press extracts 70% of the oil contained in the olive paste. The liquid is sent through a centrifuge which separates the oil from the water. The olive paste containing the remaining 30