If GXY does not achieve a 90% holding in GMM by the 5th August'16 at which level it would gain full 100% ownership through compulsory acquisition of the remaining shares, then I guess there is the option for GMM to be de-listed saving sizeable listing fees once the cut off date arrives.
At this point there would be no free market for those remaining shares and those share holders would be locked in.
GMM Price at posting:
79.5¢ Sentiment: Buy Disclosure: Held