Abstract:In this paper,the process mineralogy of gold ore from Lao is studied by means of chemical analysis, gold phase analysis, light microscope and SEM. The characteristics such as occurrence and dissemination characteristics of gold, gold mineral morphology, the distribution of free gold and inclusion gold in Ores have been ascertained. Based on this research, all-slime cyanidation process has been designed, which was authenticated by subsequent benefication process test and can direct mine production better. This study should provide empirical theoretical basis for the recovery of similar gold mines in Southeast Asia.