I don't know which mill you are referring to appycab.  As far as I know you will only get paid for the quality of your olives, not how they've been produced. 

We have ours pressed and bottled separately at Sol'dEbre and sell the oil in the UK as there isn't much of a market here for  ecologic products yet.  Also to officially call your product BIO or organic you have to be certificated, well it's what we were told, which costs and involves a lot of bureaucratic hoopla.  We just describe ours as being produced without pesticides or herbicides, which it is, and haven't had any complaints ....yet.