There's absolutely no hurry either. It's in any company's favour to wait until full value is defined before selling a stake which will typically come with a binding offtake.
MOU's, non-binding offtakes (almost always subject to the DFS++ anyway) and other working agreements before this are all well and good but realistically don't give you anything more than a good relationship with the people you are negotiating with.
You can have great relationships with many potential partners without signing documents. Everyone wants the stuff and every last buyer knows what TMT has (unlike Aussie investors).
I say wait. There's little risk in remaining a free agent for as long as possible. Be patient and sell to the right group with the right offer at the right time - which is when we've doubled our NPV and have some 99.5% samples to supply. My thoughts anyway