The halloysite clay passes through a mill into a sandgrinder, then through a surge tank and into a centrifuge. After passing through a series of mixing tanks it is fed to a filter press. It is then dried and packaged ready for export. The finished clay products are containerised and transported to Auckland for shipping to markets overseas. The halloysite beneficiation process removes most of the silica from the clay. This coarse fraction silica sand is sold in New Zealand for concreting, plastering, and recently as sand for golf course bunkers. Both the clay and silica are very abrasive and result in high wear rates on machinery.
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