Simulus Laboratories prepared a PLS solution for continuous SX-EW operations by large scale batch crushing, milling, screening, ammonia leaching and filtration processes. The SX-EW was run continuously to enable fine tuning of reagent dosing and tracking of impurities whilst producing a high grade zinc cathode. The piloting provided valuable insights to our client and enabled them to further fine tune their process a define the optimum operating cost envelope.