'And they may have continued drilling, I'm not sure. They were...

'And they may have continued drilling, I'm not sure. They were drilling as much as possible in summer/autumn before winter arrives when the ground in Tassie gets very hard and makes drilling very difficult. "

Normally the ground in Tasmania in winter is muddy and soft not hard , unless above the snow line when the ground freezes and becomes hard , doubt the Tassie tenements are above the snow line .
More is needed beside desorption and ph levels to work out if this is viable , (soil permeability and porosity for a start are needed and probably cation capacity and its effect on the ions ), and down the line we really need at the very least a pilot plant based on a a set area of land they will extract from to see what recoveries are likely to occur.
I am surprised they are spending so much time and money on exploration and not on recoveries from met testing .