Cyanide and Other Lixiviant Leaching Systems for Gold with
Jun 10, 2010·Oxygen is the main oxidant. Cyanide, which is the main ligand in these systems, forms an anionic complex, Au(CN)2, with Au(I). Gold dissolution rates are controlled by oxygen solubility in solution. Neutral lixiviant systems (pH 5 9)include thiosulphate, halogens, sulphurous acid, and bacteria plus natural organic acids as the ligand.