Consequently, machine-aided cutting is recommended for future studies. Removal of the surface epoxy coating on the PCB pieces by sodium hydroxide solution treatment was undertaken before the leaching experiment to ensure efficient leaching. The disappearance of the green surface coating on the PCB was taken as an indication of the removal of the epoxy coating. The average Cu content in the PCB pieces was quite low, (0.84±0.13) mg/g, compared to that reported in other studies. Optimum conditions for the most efficient leaching (51%) of Cu are the malonic acid concentration of 0.5 M, the H2O2 concentration of 1.0 M, and a contact time of 75 min. Though the linear model was best fitted to the experimental data, the predictive power of the model was low due to the variability in the Cu content of the PCB pieces.