Finally, the copper remaining in the quenched leach solution could be recovered by electroplating (Fig. and Fig. ). The quenched leach solution contained 2980 ppm of copper. Copper metal was used as the cathode and carbon felt was used as the anode. The salts in the leach solution served as the electrolyte. A constant potential of -0.5 V vs Ag/AgCl was applied for 2 hours, which was sufficient to electroplate >98% of the copper from solution. Demonstrating the compatibility of the electroplating method with the TCCA/NaBr leach solution is important in recovering the two most valuable metals in the leach solution by mass: gold and copper. Gold recovery from random-access memory (RAM) cards obtained from obsolete computers. The RAM cards were milled and concentrated with a shaker table to provide a metal powder rich in gold and copper. The powder was leached with the TCCA/NaBr leaching system and gold was selectively recovered using the poly-1 sorbent. The copper in the leach solution was then recovered by electroplating.