If SDL IO has value for the Chinese why would you sell less than...

If SDL IO has value for the Chinese why would you sell less than .45 if Glencore come to the table - why is .45 & .55 also accepted if we hold something they need as there seems no long term thinking involved. Not sure if SDL have been doing more mining exploration in the hope of new findings or just sitting on their hands waiting for this deal which seems they have neglected their positions and wasted opportune time.