If memory serves me correctly, they built a complete test plant in Canada a number of years ago ti do a proof of concept - they even showed us samples of the finished product
That is why they are proceeding with confidence - this is from their website
The final processing design was derived after thousands of hours of bench and pilot plant test work conducted by Fluor, Kemetco Research, Kappes Cassiday, with support from Veolia and FLSchmidt. Based on these efforts, the project’s engineering team (led by Fluor) designed the Project’s processing facilities using known and commercially proven technology to accommodate the unique Rhyolite Ridge ore. The test work produced a clear understanding of the processing chemistry, sequences, and understanding of the set points for optimal operations, and allowed Ioneer to produce a complete mass balance based upon bench scale and pilot-level verification. This work was used as the basis to develop the plant’s engineering, cost estimates, and production forecasts in the Overall recoveries are estimated to be 85% for the lithium carbonate, 95% for lithium hydroxide, and 79% for the boric acid.
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