Au and BM Concentrations in WPCBs. Chemical analysis results in Table show that each WPCB used in the preparation of WPCB iodide leachate was comprised of 0.11 wt.% Au, 55.7 wt.% Cu, 7.00 wt.% Al, 1.60 wt.% Ni, and 3.31 wt.% Fe. It is important to note that the high Au and Cu concentration of the model/ideal WPCBs used in this work is over 3 times higher than that of typical/non-ideal WPCBs. Ideal/model WPCBs were used since they allowed for the simple preparation of homogenous WPCB feed particulate. The use of ideal homogenous WPCB feeds with high Au and Cu concentrations was also beneficial since it allowed for accurate mass balancing of Au and Cu after leaching and electrowinning. Effective mass balancing of Au and Cu is important since these metals hold most of the economic value of WPCBs and they are the only metals which reported into the WPCB iodide leachate in appreciable concentrations. The use of typical/non-ideal WPCBs was not considered in this work due to scope constraints, and because the use of typical/nonideal WPCBs may have resulted in a decreased statistical significance of results, due to increased variability/imprecision between test results. This is because the use of typical WPCBs is expected to result in a more inconsistent/variable WPCB feed composition between the various leaching trials (due to the complex and variable chemistry of typical/non-ideal WPCBs), and as a result increase the variability of the laboratory experiment results and thus decrease statistical significance.