Abstract: In order to further improve the leaching rate of gold and enhance the economic benefits of enterprises，aiming at the problems of the leaching rate reducing of gold after gold concentrate blending in a smelter，a systematic process mineralogy study was carried out，and the factors affecting the cyanide leaching of gold concentrate were discussed. The results show that the main factors affecting the gold leaching rate in the production site are the insufficient disintegration of the materials in the mixing section of the twostage roasting system and the existence of agglomerated sulfide pseudo-particles. Illite in gold concentrate is one of the gold-bearing minerals. In the roasting process，the dehydroxylation reaction，structural damage， phase transformation and binding effect on the gold contained in illite are the secondary factors affecting the gold leaching rate index in the production site.

Key words: gold concentrate, two-stage roasting, cyanide gold extraction, gold leaching rate, influencing factors