Also the industrial practice of conditioning fresh activated carbon using either tumbling or screening to remove undersized or imperfect particles before being introduced into the processing circuit can also contribute to carbon loss. Conditioning tends to minimise the possibility of gold being lost on undersized carbon particles within the circuit, which ultimately ends up in the tailings. Another important feature of carbons conditioning is that it often indicates how effective the production of the activated carbon was carried out by the manufacturer (Avraamides, 1989).