The Gekko inline leach reactor (ILR) at the Jundee site was installed in 2005 by Proteus Engineers and has been consistently achieving in excess of 90% recovery with over 95% availability. The ILR has replaced the shaking tables that were originally installed in the plant.
The Jundee ILR has operated with very little downtime, due to its simple design and excellent maintenance program by the gold room operators at Jundee.
ILR units require very little maintenance other than a daily grease and inspection (the same as any slurry pump) and run with very little operator input. All functions of the ILR are controlled by a programmable logic controller (PLC). The PLC allows for changes to the program, as evidenced in 2006 when a separate water source was introduced to the circuit to minimise downstream issues. The program change was able to be completed off-line and uploaded in a few minutes with no loss of production.
Greg Farrell, process superintendent at Jundee, had this to say about the ILR: “Solution clarity is very good with minimal floc addition and the gold room operators are all very happy with the ILR . . . there has been very little maintenance required on the unit.”
To achieve this excellent outcome the Jundee site invested in a dedicated floc system to improve their solution clarity. In the post-installation period they optimised their reagent usage and saw the benefits of introducing a dedicated floc system as distinct from the generic plant floc. All that was required was the addition of a small drum, an agitator, a pump and integration into the ILR PLC.