The electrowinning cell was comprised of three distinct, hollow, open-top cubic Pyrex tanks (feed, catholyte, and anolyte tank) with inner volumes of 2197 mL. Each tank was equipped with a 20/20 cm gasket. A circular hole with a 10 cm diameter was machined into the left and right lateral faces of the catholyte tank, left lateral face of the anolyte tank, and right lateral face of the feed tank. A square 12/12 cm Au selective ion exchange extractant membrane (Au-IEM) was positioned radially between the right lateral face of the feed tank and the left lateral face of the catholyte tank, while a square 12/12 cm anion exchange membrane (AEM) was positioned between the left lateral face of the anolyte tank and the right lateral face of the catholyte tank. Eight nut and bolt fasteners were used to join the three tanks of the electrowinning cell together. These fasteners passed through the gasket of the tanks.