Experimental study on heap leaching of gold oxide ore

The gold oxide ore from Guizhou was included in quartz, limonite, actinolite, amphibole and sericite in fine grain shape. The effect factors of gold leaching were determined by orthogonal heap leaching test. The order of these factors were grain size ＞ leaching time ＞ addition of NaCN ＞ addition of lime. The index of leaching rate of 90% could be achieved under the optimum conditions.