Amigo, to put it simply, cerium is a rare earth that is...

Amigo, to put it simply, cerium is a rare earth that is plentiful and not wanted. ARR is focused on its magnetic rare earth production. So, the roasting/calcining step was added to remove the cerium. They reported honestly that there is a small reduction in the recovery of Total Rare Earths by the roasting/calcining step. It is early days for ARR's metallurgy, and this Preliminary Flowsheet is not the end of the story. In contrast MP and Lynas have been sending their concentrates to China and Malaysia for decades because they gave up trying to develop metallurgy. Now, be a good boy and go back to your employer and ask for more blue pills and red pills.