I think production will happen with some wells free flowing and...

I think production will happen with some wells free flowing and the main well being pumped to keep the processing volume to what is needed.
3 to 4 wells feeding tanks and holding ponds under there own pressure would create pumping cost savings with at least one having a pump connected for when more volume is needed.
Initially the pilot plant may not need for the wells to be pumped until higher processing happens in latter years.
It is hard to say how a pump or pumps will operate ,as some zones will need to be pumped if they are to be included in regards to mainly B Br I and Mg.
Overall there will be huge pumping savings ,regardless of how the brine is collected from the brine zones.