Ann: First Concentrate Shipment - High Quality Confirmed, page-65

Here is a portion of what they said - full details in announcement 29 May 18. But read on & see they identified & fixed the issue. - All good.

During the process of drilling, sampling and assaying, Pilbara identified two key issues causing contamination and,hence, artificial elevation of the Fe2O3 assays for the drill samples. Firstly, the highly abrasive nature of the Li2O/Ta2O5 mineralised pegmatite on the RC drilling bits and rods has resulted in iron contamination of the drill samples in the field. Secondly, when the drill samples were pulverised in laboratory in steel containers, the highly abrasive nature resulted in further iron contamination. As such, Pilbara completed a statistical analysis into both of the above mentioned issues which then allowed for factoring of the Fe2O3 assays to account for the contamination.