RE: RNS5 Jul 2015 15:29
It looks like poor installation, exert from rns:
"After inspection, it was identified that one of nine weir plates in the "recently commissioned" SX mixer settler had fallen out of position, resulting in the ability of the organic inventory to escape from the circuit via the raffinate and onto the dumps. The reasons for the failure of the weir plate are currently being investigated by site management."