They don't have to do it, looks as though there is excess Sulphate generated in the production process and they want to make use of it. I would assume the economics stack up. P.22.
The Scoping Study includes the production of 50,000 tpa SOP (Stage 1) and 100,000 tpa SOP (Stage 2) through the conversion of imported MOP to SOP using the natural excess sulphate in the Project brine. Process plant design and capital expenditure incorporates an MOP circuit.13
Figure 7. The Lake Wells Potash Project flow diagram
They also mention the prospect of ancillary/by-products that will be investigated in due course.
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