The main goal of this paper is to study the extraction of the oil from the solid waste after the extraction of virgin olive oil (pomace) of two various mills collected in Batna area. Also, two extractions modes are used: a physical extraction mode (Hydraulic press) and a chemical one. Olive pomace oil is a by-product from the olive oil industry that is still being used in the food industry as a low value vegetable oil. The results obtained are quantitative and qualitative. The first ones show that the best extracted oil quantity obtained is by the chemical way and especially with the mixture "Chloroform/Methanol". This result is the same (12,59-15,91%) with either samples of solid residues from traditional hydraulic pressing system or three-phase centrifugation separation process. The qualitative result obtained shows that the oil extracted by these two modes reveals the significant difference in all the physical and chemical parameters such as the relative density at 20°C, the refractive index, the acid value, the saponification value, the peroxide value and the iodine value. Except the unsaponifiable matter which haven’t a difference Crude olive pomace oil needs to be refined and is blended with virgin olive oils before being used as edible oil
