Eddie,
Here is how the mill works.
They wash the olives
They throw them, a pallet at a time, about 1,000lbs, into a big screw like machine. This thing grinds them into a paste, pitts and all. The liquid is siphoned off the top of the paste and put into a big spinner machine. The spinner machine spins really really fast and the oil comes to the top and the water is let out the bottom. It is then pumped into big vats.
End of process, pure olive oil, just pressed out of the olive, only by mechanical means. No refining, heating etc. Just pure olive oil.