Ann: Exceptionally Strong Scoping Study Findings, page-53

Let's just call it Mannheim-like.
And let's not pretend that a truck fully laden with MOP has the same operating cost as an empty truck that has to drive in anyway.
Furthermore they will likely be limiting their SOP distribution/export point to their MOP pick up point.
I not going to bother reading the study because I know this isn't the best ASX potash play.
The need for MOP means they can't achieve great recovery by conventional means. That means the brine isn't as desirable as other brines. Presumably SO4 has similar brine chemistry and similar rates of recovery.