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treating industrial waste streams with high residual concentration of mixed metal ions and acid mine drainage. This process has been reported to achieve higher metal removal compared with the industrially prevalent lime precipitation, due to the sparingly soluble nature of the metal sulphide precipitates formed. However, precipitation is governed by high levels of supersaturation which favour the formation of fine particles (Lewis, 2010). Consequently, some of the metal sulphide fines formed exhibit slow settling dynamics and thus tend to remain suspended in solution. The formation of fines, which reduces the efficiency of gravitational solid-liquid separation, is encountered in the mining industry. As a result, in most mining processes, large tanks to which chemical flocculant is added are required. Improving the settling characteristics of such fines without the addition of chemical flocculant would reduce both the settling time and volume required for settling. As a result, there is a need to investigate post-precipitation techniques that may improve the settling characteristics of such fines. Commonly, fines suspended in solution are referred to as stable colloids. Colloidal stability may be attributed to strong interparticle electrostatic repulsive forces that hinder aggregation (Park et al., 2010). When an electrolyte solution is in contact with another phase, such as a solid, gas, or another liquid immiscible with the electrolyte, a spontaneous redistribution of ions between the two phases takes place (Derjaguin, Churaev, and Muller, 1987). It follows that surfaces acquire a surface electric charge when brought into contact with a polar medium such as water. According to Derjaguin, Churaev, and Muller (1987) and Shiebl, Babick, and Stintz 2012), this charge may be acquired through surface ionization, ion adsorption, and ion dissolution. The mechanism behind this acquisition of charge is as follows: a cloud of counter-ions forms around the charged particle in solution, creating an electro-neutral counter-ion complex (Haung et al., 1999; Velev and Bhatt, 2006). The ions in the fluid layer closest to the particle surface are strongly attracted to the substrate and are hence immobile. This is known as the Stern layer. Co-ions are repelled by the particle surface. However, they exist in the diffuse layer where both co-ions and counter-ions are found as mobile ions that are adsorbed in equilibrium with one another. Collectively, the particle surface, Stern layer, and diffuse layer make up the electric double layer (Derjaguin, Churaev, and Muller, 1987). Within the electric double layer, the A modification of the zeta potential of copper sulphide by the application of a magnetic field in order to improve particle settling