Why would they buy us out, wishful thinking? we could still be in this situation of not being able to sell in 10 years time if hartree chooses to not buy us out, maybe they feel they have all the exposure they want, and worst of all they have a blocking stake even if someone did make a offer for the mine.
Hartree is the only one in control now, what happens will be totally up to them, to state the obvious.
Also If you were Hartree and you had not interest in trying to sell out at a better margin, why would you list on the ASX?
