" The  HPA  plant  at  full  capacity  of  5  tpd  is  designed  to  process  approximately  7,500  tonnes  of  aluminous  clay  per  year  containing at least 23% alumina, which could be sourced from the Corporation’s Grand-Vallée deposit, and/or from third- party deposits containing clay or kaolin that is deemed suitable as an HPA plant feedstock. "...............RUSAL's main deposits are Kaolin and the worlds largest user. Page 11: HPA Feedstock.   Glta! Chris