I don't think a borefield is a big deal. At the RWD AGM MR mentioned using bores in conjunction with trenches. I assume there would be a greater energy requirement but Karly (RWD & GRM) has a gas pipeline very close.
I think its fair to say that RWD may have a lower operating cost if its brine is sub surface rather than 100-200M deep.
I think its all academic until either company can demonstrate sustained brine recovery from depth.
Blackswan made this very point in there research report however they have gambled their own money on this risk not being a risk.
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