Well, I guess the solution is for QF to make up more permanent DMMs to enable them to work the 8 hour shift. That would solve the problem of QF being in contravention of the existing agreements due to directing current DMMs to work 12 hour shifts (when no current extended hours shift agreement is in place).
An alternative would be to make up some extra acting DMMs to cover the 8 hour shift until such times as an extended hours shift agreement is made that satifies both parties.
Does QF even want to make an extended hours shift agreement, or are they happy with the operation running on an 8 hour shift?