Many gold mining operations employ cyanide to recover gold form different ore types and the main method for recovering precious metals involves cyanidation processes such as heap leaching or agitated leaching techniques. Since tailings from gold mines with cyanidation present cyanide, it must be neutralized in order to reduce the level of toxicity. The main cyanide detoxification processes employed are chlorination, INCO, Caro’s acid, hydrogen peroxide, natural and biological.