Im pretty sure that capex will drop considerably for the Green...

Im pretty sure that capex will drop considerably for the Green river project as the infradtrucure is in place already
Roads, trainline , power, gas , water...
Also the brine has very little Boron, so that componant of the plant will maybe be pretty much non existent, (capex reduction). The KOCH componant for making eluate is ~$149mill Ive read,
ASN's carbonation plant I have no figures.
The best thing is it will all be done on site. Farm to fork 99.95% BG carbonate.

KOCH were going to put $225mill into compass minerals at one stage until compass cancelled their dle project.